CHEM FINAL TOMORROW!!! Need some help with concentration stuff. If someone could tell me how this works it would be incredibly helpful!!

At the usual working conditions of 101.5 kPa and 21°C, the chemical oxygen generator system would generate roughly 220.84 litres of oxygen using 500 g of LiClO4.

We may use the ideal gas law and stoichiometry to calculate how many litres of oxygen are created by the chemical oxygen generator system employing 500 g of LiClO4.

We must first determine the moles of LiClO4. LiClO4 has a molar mass of approximately 106.39 g/mol. As a result, 4.704 mol of LiClO4 are produced from 500 g of LiClO4 using the formula: 500 g / 106.39 g/mol

We can see from the chemical equation that 1 mole of LiClO4 results in 2 moles of O2. 4.704 mol of LiClO4 will therefore result in:

2 mol O2 / 1 mol LiClO4 4.704 mol LiClO4 = 9.408 mol O2

The moles of O2 under the specified conditions must then be converted to volume. The ideal gas law, which goes as follows:

PV = nRT

Where:

P = pressure = 101.5 kPa

V = volume (in liters)

n = moles of gas = 9.408 mol

R = ideal gas constant = 8.314 J/(mol·K)

T = temperature = 21°C = 294 K (converted to Kelvin)

Rearranging the equation to solve for V:

V = (nRT) / P

V = (9.408 mol × 8.314 J/(mol·K) × 294 K) / (101.5 kPa × 1000 Pa/kPa)

Simplifying the units:

V = (9.408 × 8.314 × 294) / 101.5

V ≈ 220.84 liters

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The solubility chart provides information about the solubility of various compounds in water. Here are the solubilities of the given compounds:

a. (NH₄)₂CO₃: According to the solubility chart, most carbonate (CO₃²⁻) salts are insoluble, except for those of Group 1 metals (alkali metals) and ammonium (NH₄⁺). Therefore, (NH₄)₂CO₃ is soluble.

b. Fe(OH)₂: Hydroxide (OH⁻) salts of transition metals, including iron (Fe), are generally insoluble, except for those of Group 1 metals and ammonium. Therefore, Fe(OH)₂ is insoluble.

c. Ca(OH)₂: Calcium hydroxide (Ca(OH)₂) is soluble. However, the given compound "CaOH" appears to be missing the subscript ₂, indicating two hydroxide ions. If it should be Ca(OH)₂, then it is soluble.

d. PbCl₂: According to the solubility chart, chloride (Cl⁻) salts, including lead chloride (PbCl₂), are generally soluble, except for those of silver (Ag⁺), lead (Pb²⁺), and mercury (Hg₂²⁺). Therefore, PbCl₂ is insoluble.

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The following chemical equations must be balanced:

1. N2 + 3 H2 → 2 NH3

Type: Synthesis

2. 2 KClO3 → 2 KCl + 3 O2

Type: Single Replacement

3. 2 NaF + ZnCl2 → ZnF2 + 2 NaCl

Type- Decomposition

4. 2 AlBr3 + 3 Ca(OH)2 → Al2(OH)6 + 6 CaBr2

Type- Double Replacement

5. 2 H2 + O2 → 2 H2O

Type: Combustion

6. 2 AgNO3 + MgCl2 → 2 AgCl + Mg(NO3)2

Type: Synthesis

7. 2 Al + 6 HCl → 2 AlCl3 + 3 H2

Type: Decomposition

8. C3H8 + 5 O2 → 3 CO2 + 4 H2O

Type: Combustion

9. 2 FeCl3 + 6 NaOH → Fe2O3 + 6 NaCl + 3 H2O

Type: Double Replacement

10. 4 P + 5 O2 → 2 P2O5

Type: Synthesis

11. 2 Na + 2 H2O → 2 NaOH + H2

Type: Single Replacement

12. 2 Ag2O → 4 Ag + O2

Type: Decomposition

13. C6H12O6 + 6 O2 → 6 CO2 + 6 H2O

Type: Combustion

14. 2 KBr + MgCl2 → 2 KCl + MgBr2

Type: Double Replacement

15. 2 HNO3 + Ba(OH)2 → Ba(NO3)2 + 2 H2O

Type: Double Replacement

16. C5H12 + 8 O2 → 5 CO2 + 6 H2O

Type: Combustion

17. 4 Al + 3 O2 → 2 Al2O3

Type: Synthesis

18. Fe2O3 + 2 Al → 2 Fe + Al2O3

Type: Single Replacement

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Answer:

Thermal Conduction

Explanation:

When 30.0 g of iron reacts with 258 g lead (Il) nitrate and 67.8 grams of lead form, then the percentage yield is 40.62%.

Given information,

Mass of iron = 30g

Mass of Lead (III) nitrate = 258g

Mass of lead = 67.8g

The balanced equation for the reaction is:

2 Fe + 3 Pb(NO₃)₂ → 3 Pb + 2 Fe(NO₃)₃

The stoichiometric ratio between iron (Fe) and lead (Pb) is 2:3.

The moles of Fe:

Moles of Fe = mass of Fe / molar mass of Fe

Moles of Fe = 30.0/ 55.845

Moles of Pb = (3/2) × moles of Fe

The theoretical yield of Pb:

Mass of Pb (theoretical) = moles of Pb × molar mass of Pb

Mass of Pb (theoretical) = (3/2) × moles of Fe × molar mass of Pb

The percent yield:

Percent yield = (actual yield / theoretical yield) × 100

Actual yield = 67.8 g

Theoretical yield = (3/2) × (30/55.845) × 207.2 = 166.95

Percent yield = 67.8/166.9  × 100 = 40.62%

Thus, the percentage yield is 40.62%.

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The volume of the gas at standard temperature and pressure conditions is approximately 12.77 liters.

To find the volume of the gas at STP, we can use the combined gas law:

[tex]\frac{P_1V_1}{T_1} = \frac{P_2V_2}{T_2}[/tex]

Note that: at STP (Standard Temperature and Pressure) is defined as a temperature of 0°C (273.15 K) and a pressure of 1 atm.

Given that:

P₁ = initial pressure = 4.71 atm

V₁ = initial volume = 2.99 L

T₁ = initial temperature = 28.10 °C = ( 28.10 + 273.15 ) = 301.25 K

P₂ = final pressure (STP pressure ) = 1 atm

T₂ = final temperature (STP temperature)  = 0°C = 273.15 K

V₂ = final volume = ?

Substituting the given values into the formula:

[tex]\frac{P_1V_1}{T_1} = \frac{P_2V_2}{T_2}\\\\\frac{4.71\ *\ 2.99 }{301.25} = \frac{1\ *\ V_2}{273.15 }\\\\V_2 = 12.77\ L[/tex]

Therefore, the final volume is 12.77 litres.

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Balance the following chemical equations:

1. N2 + 3 H2 → 2 NH3

Ex: Synthesis reaction

2. 2 KClO3 → 2 KCl + 3 O2

Single Replacement reaction

3. 2 NaF + ZnCl2 → ZnF2 + 2 NaCl

Decomposition reaction

4. 2 AlBr3 + 3 Ca(OH)2 → Al2(OH)6 + 6 CaBr2

Double Replacement reaction

5. 2 H2 + O2 → 2 H2O

Combustion reaction

6. 2 AgNO3 + MgCl2 → 2 AgCl + Mg(NO3)2

Synthesis reaction

7. 2 Al + 6 HCl → 2 AlCl3 + 3 H2

Decomposition reaction

8. C3H8 + 5 O2 → 3 CO2 + 4 H2O

Combustion reaction

9. 2 FeCl3 + 6 NaOH → Fe2O3 + 6 NaCl + 3 H2O

Double Replacement reaction

10. 4 P + 5 O2 → 2 P2O5

Synthesis reaction

11. 2 Na + 2 H2O → 2 NaOH + H2

Single Replacement reaction

12. 2 Ag2O → 4 Ag + O2

Decomposition reaction

13. C6H12O6 + 6 O2 → 6 CO2 + 6 H2O

Combustion reaction

14. 2 KBr + MgCl2 → 2 KCl + MgBr2

Double Replacement reaction

15. 2 HNO3 + Ba(OH)2 → Ba(NO3)2 + 2 H2O

Double Replacement reaction

16. C5H12 + 8 O2 → 5 CO2 + 6 H2O

Combustion reaction

17. 4 Al + 3 O2 → 2 Al2O3

Synthesis reaction

18. Fe2O3 + 2 Al → 2 Fe + Al2O3

Single Replacement reaction

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Answer:

Sodium (Na) is a highly reactive metal, while sodium chloride (NaCl) is a compound formed by the combination of sodium and chlorine (Cl). Sodium exists as a pure element, whereas sodium chloride is a stable, crystalline compound.

Sodium is a soft, silvery-white metal that is highly reactive and can easily react with water or air. In contrast, sodium chloride is a white crystalline solid that is highly stable and does not react readily with water or air. Sodium chloride is commonly known as table salt and is widely used as a seasoning and food preservative.

Answer:

a. P2O7 - This is a covalent compound. P and O have similar electronegativities and they form a covalent bond between them, rather than an ionic bond.

b. SnBr2 - This is a covalent compound. Sn and Br have different electronegativities, but they still form a covalent bond due to their relatively small difference in electronegativity.

c. Fe(OH)2 - This is an ionic compound. Fe has a higher electronegativity than O and H, so it tends to donate its electrons and become positively charged. This results in the formation of ionic bonds between Fe and OH.

d. Cl3O8 - This is a covalent compound. Cl and O have similar electronegativities, so they form covalent bonds rather than ionic bonds.

Based on Table G, the mass of KCl that must be dissolved in 200 grams of H₂O at 10 °C to make a saturated solution is 60 g.

Based on Table G, the solubility of KCl at 10°C is given as 30 g/100 g water.

To calculate the mass of KCl that can be dissolved in 200 grams of water at 10°C, we can set up a proportion:

(30 g KCl / 100 g water) = (x g KCl / 200 g water)

Cross-multiplying and solving for x, we get:

x g KCl = (30 g KCl / 100 g water) * (200 g water)

x g KCl = 60 g KCl

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The molar mass of the gas is approximately 20.72 g/mol.

To determine the molar mass of the gas, we can use the ideal gas law equation:

PV = nRT

where:

P = pressure (in atm)

V = volume (in liters)

n = number of moles

R = ideal gas constant (0.0821 L·atm/(mol·K))

T = temperature (in Kelvin)

First, let's convert the given values to the appropriate units:

Pressure = 432 torr = 432/760 atm

Volume = 333 mL = 333/1000 L

Temperature = 23°C = 23 + 273.15 K

Substituting the values into the ideal gas law equation:

(432/760) atm * (333/1000) L = n * 0.0821 L·atm/(mol·K) * (23 + 273.15) K

Simplifying the equation:

0.191 atm * 0.333 L = n * 0.0821 L·atm/(mol·K) * 296.15 K

Solving for the number of moles (n):

n = (0.191 atm * 0.333 L) / (0.0821 L·atm/(mol·K) * 296.15 K)

n ≈ 0.01012 moles

Finally, we can calculate the molar mass using the formula:

Molar mass = mass of the gas sample / moles of gas

Molar mass = 0.210 g / 0.01012 moles

Molar mass ≈ 20.72 g/mol

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The limiting reactant will be the one that produces fewer moles of BaSO4. The excess reactant will be the one that has moles left over after the reaction.

To determine the grams of BaSO4 produced and the limiting reactant, we need to compare the stoichiometry of the balanced chemical equation for the reaction between Ba(NO3)2 and Na2SO4, which is:

Ba(NO3)2 + Na2SO4 → BaSO4 + 2NaNO3

First, calculate the number of moles for each reactant:

Moles of Ba(NO3)2 = 200.0 g / molar mass of Ba(NO3)2

Moles of Na2SO4 = 100.0 g / molar mass of Na2SO4

Then, calculate the moles of BaSO4 formed by comparing the stoichiometric coefficients:

Moles of BaSO4 formed = Moles of Ba(NO3)2 (according to the stoichiometry ratio)

Next, calculate the grams of BaSO4 formed:

Grams of BaSO4 formed = Moles of BaSO4 formed × molar mass of BaSO4

To identify the limiting reactant, compare the moles of BaSO4 formed from each reactant. The reactant that produces fewer moles of BaSO4 is the limiting reactant.

To determine the excess reactant remaining, calculate the moles of excess reactant and then convert it to grams.

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To produce 11.00 moles of MgCl2, you would need 858.00 grams of NaOH.

To determine the amount of NaOH needed to produce 11.00 moles of MgCl2, we need to use stoichiometry and the balanced chemical equation:

[tex]MgCl_2 + 2 NaOH[/tex] → [tex]2 NaCl + Mg(OH)_2[/tex]

From the balanced equation, we can see that the mole ratio between [tex]MgCl_2[/tex]and NaOH is 1:2.

Therefore, for every 1 mole of[tex]MgCl_2[/tex], we need 2 moles of NaOH.

Given: Moles of [tex]MgCl_2[/tex]= 11.00 moles

Using the mole ratio, we can calculate the moles of NaOH required:

moles of NaOH = 2 * moles of MgCl2

moles of NaOH = 2 * 11.00 moles

moles of NaOH = 22.00 moles

Now, we need to convert the moles of NaOH to grams using the molar mass of NaOH:

The molar mass of NaOH = 22.99 g/mol + 16.00 g/mol + 1.01 g/mol = 39.00 g/mol

grams of NaOH = moles of NaOH * molar mass of NaOH

grams of NaOH = 22.00 moles * 39.00 g/mol

grams of NaOH = 858.00 grams

Therefore, to produce 11.00 moles of [tex]MgCl_2[/tex], you would need 858.00 grams of NaOH.

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Answer:

Question 1:

1: a metal and a nonmetal

3: a metal and a polyatomic anion

4: a polyatomic cation and a metal

Question 2:

Cations give away electrons and anions accept those electrons

The extraction of iron from haematite ore involves a process called reduction. Reduction is the chemical reaction in which oxygen is removed from a compound, resulting in the formation of a new substance.

In the case of haematite, the reduction process involves removing the oxygen from the iron oxide (Fe2O3) to obtain elemental iron (Fe). This is typically achieved through a process called smelting, which is carried out in a blast furnace. Before the haematite ore is reduced in a blast furnace, it needs to undergo a series of steps to separate impurities and prepare it for the reduction process. The first step is crushing and grinding the ore into smaller particles. This is done to increase the surface area of the ore, allowing for better contact with the reducing agent. After crushing and grinding, the ore is then subjected to a process called beneficiation, where it is separated from gangue materials and other impurities.

Beneficiation techniques vary, but commonly involve processes such as gravity separation, magnetic separation, and flotation. These methods exploit the differences in physical and chemical properties between the haematite ore and the impurities, allowing for their separation. Once the ore is purified and separated, it is ready to be reduced in a blast furnace, where the smelting process takes place.

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Answer:

3rf or 5d cd Yu been successful of a new future

The name of the branched alkane shown below is 2- methylheptane that is in option D as alkane is a type of hydrocarbon, which is a compound consisting of hydrogen and carbon atoms only. 

Alkanes are characterized by having single bonds between carbon atoms and being saturated hydrocarbons, meaning they have the maximum number of hydrogen atoms bonded to each carbon atom. Alkanes are often referred to as "paraffins" and serve as the simplest and most basic form of hydrocarbons. They are relatively unreactive and are commonly found in petroleum and natural gas. The systematic names for alkanes are derived from the prefix "n-" or "normal-," followed by the Greek numerical prefix indicating the number of carbon atoms. For example, "n-pentane" refers to the straight-chain alkane with five carbon atoms.

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The dissociation of sodium chloride in water allows it to act as an electrolyte, conducting electricity through the movement of ions.

The bonding between sodium and chlorine is classified as ionic bonding. In this type of bonding, electrons are transferred from one atom to another, resulting in the formation of ions. Sodium (Na) readily donates one electron from its outermost shell to achieve a stable electron configuration, while chlorine (Cl) accepts this electron to fill its outermost shell. As a result, sodium forms a positively charged ion (Na+), known as a cation, while chlorine forms a negatively charged ion (Cl-), known as an anion. The electrostatic attraction between these oppositely charged ions creates a strong bond between sodium and chlorine, forming sodium chloride (NaCl) as the resulting compound.

When sodium chloride is dissolved in water, the compound dissociates into separate sodium cations and chloride anions. Water molecules, which have a polar nature, surround the individual ions due to their attraction to opposite charges. This process is called hydration or solvation. The water molecules effectively separate the sodium and chloride ions, leading to the compound's dissolution. This is because water molecules have a higher affinity for the charged ions compared to the ionic bond holding the compound together.

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To calculate the molarity of the solution, we need to know the number of moles of BaI2 and the volume of the solution in liters.

First, let's calculate the number of moles of BaI2. We can use the formula:

Number of moles = Mass (in grams) / Molar mass

The molar mass of BaI2 can be calculated as follows:

Ba: atomic mass = 137.33 g/mol

I: atomic mass = 126.90 g/mol

2 x I = 2 x 126.90 g/mol = 253.80 g/mol

Total molar mass of BaI2 = 137.33 g/mol + 253.80 g/mol = 391.13 g/mol

Number of moles of BaI2 = 413 g / 391.13 g/mol ≈ 1.056 moles

Next, we need to convert the volume of the solution from milliliters to liters:

Volume of solution = 750 ml / 1000 = 0.75 L

Finally, we can calculate the molarity using the formula:

Molarity = Number of moles / Volume of solution

Molarity = 1.056 moles / 0.75 L ≈ 1.408 M

Therefore, the molarity of the BaI2 solution is approximately 1.408 M.

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If a compound is found to contain 3.622 % carbon and 96.38 % bromine by weight. The molecular formula for the compound is CBr4.

First, get the empirical formula in order to calculate the molecular formula of the chemical. The empirical formula shows the atoms of a compound in their most straightforward whole number ratio.

Suppose 100 grams of the substance. To determine the mass of carbon and bromine in the compound using the provided percentages.

Mass of C = 3.622% of 100g

= 3.622g

Mass of Br = 96.38% of 100g

= 96.38g

The next step is to determine the atomic masses of carbon and bromine in order to determine the number of moles for each.

Atomic mass of carbon = 12.01 g/mol

Atomic mass of bromine = 79.90 g/mol

Moles of C = (mass of carbon) / (atomic mass of carbon)

= 3.622g / 12.01 g/mol

= 0.3016 mol

Moles of Br = (mass of bromine) / (atomic mass of bromine)

= 96.38g / 79.90 g/mol

= 1.205 mol

Divide the moles of each element by the fewest number of moles obtained, in this case the moles of carbon, to arrive at the empirical formula.

Empirical formula ratio:

C: (0.3016 mol) / (0.3016 mol)

= 1

Br: (1.205 mol) / (0.3016 mol)

= 4

The empirical formula for the compound is C₁Br4.

To determine the molecular formula, it is required to know the molecular weight of the compound. The molecular weight is  331.61 g/mol.

To find the number of empirical formula units in the molecular formula, divide the molecular weight by the empirical formula weight.

Empirical formula weight:

C = 12.01 g/mol × 1

= 12.01 g/mol

Br= 79.90 g/mol × 4

= 319.60 g/mol

Empirical formula weight = 12.01 + 319.60

= 331.61 g/mol

Now find the number of empirical formula units in the molecular formula:

Number of empirical formula units

= (molecular weight) ÷ (empirical formula weight)

Number of empirical formula units

= 331.61 g/mol / 331.61 g/mol

= 1

The number of empirical formula units is 1, the empirical formula C₁Br4 is would be  the molecular formula for this compound.

Thus, the molecular formula for the compound is CBr₄.

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The limiting reagent is chlorine and the correct option is option 2.

In a chemical reaction, the limiting reagent is the reactant that determines the quantity of the products that are produced. Limiting reagents are defined as the substances which are entirely consumed in the completion of a chemical reaction and so a limiting reagent limits the formation of products and determines the amount of products obtained in the reaction.

The limiting reagent can be identified from the number of moles in the reaction, the one that is having the lesser number of moles acts as a limiting reagent in the reaction.

Given,

Moles of hydrogen = 5.3 moles

Moles of chlorine = 4.8 moles

Limiting reagent is the one that has lesser number of moles and thus chlorine is the limiting reagent in this reaction.

Thus, the ideal selection is option 2.

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We can use the following formula to determine how many grams of AgNO3 are needed to make a 0.30 M solution with a volume of 750 ml:

moles = volume (L) x concentration (M)

The volume provided must first be converted from milliliters to liters:

Volume = 750 ml ÷ 1000 ml/L = 0.75 L

Now we can find the molarity of AgNO3:

moles = 0.30 M × 0.75 L = 0.225 moles

To find the grams of AgNO3, we need to use the molar mass of AgNO3, which is calculated as follows:

Ag: 1 atom × 107.87 g/mol = 107.87 g/mol

N: 1 atom × 14.01 g/mol = 14.01 g/mol

O: 3 atoms × 16.00 g/mol = 48.00 g/mol

Total molar mass of AgNO3:

107.87 g/mol + 14.01 g/mol + 48.00 g/mol = 169.88 g/mol

Now, we can calculate the grams of AgNO3 needed:

grams = moles × molar mass

grams = 0.225 moles × 169.88 g/mol = 38.22 grams

Therefore, approximately 38.22 grams of AgNO3 are needed to prepare 750 ml of a 0.30 M solution.

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The density of the block of wood is approximately 38.40 g/mL.

To calculate the density of the block of wood, we need to use the formula:

Density = Mass / Volume

First, let's convert the mass of the block from grams (g) to milliliters (mL). Since the density is expressed in g/mL, the mass and volume need to have the same units.

Given:

Mass of the block = 450 g

Change in water level = 16.22 mL - 4.50 mL = 11.72 mL

Density = 450 g / 11.72 mL

Calculating the density:

Density ≈ 38.40 g/mL

Therefore, the density of the block of wood is approximately 38.40 g/mL.

The density of a substance represents its mass per unit volume. In this case, the mass of the block of wood is 450 g, and the volume is determined by the change in water level when the block is dropped into the graduated cylinder. By subtracting the initial water level (4.50 mL) from the final water level (16.22 mL), we find that the block occupies a volume of 11.72 mL. Dividing the mass by the volume gives us the density of the block, expressed in grams per milliliter.

It's important to note that the density of wood can vary depending on factors such as the type of wood and its moisture content. The value calculated here represents the density of the specific block used in the given scenario.

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Dividing the class into groups and assigning them the task of measuring the mass of the same object multiple times promotes scientific inquiry, encourages critical thinking.

It also provides an opportunity to discuss the concepts of precision, accuracy, and the role of statistical analysis in scientific investigations.

When the teacher divides her class into groups and assigns each group the task of measuring the mass of the same object three times, it allows for multiple measurements to be taken in order to obtain more accurate and reliable results. This approach is a common practice in scientific experiments and data collection.

By having multiple groups perform the measurements, several factors come into play:

1. Precision: Each group's measurements may have some inherent variability due to factors such as the sensitivity of the measuring instrument, human error, or slight variations in the experimental conditions. Taking multiple measurements allows for better assessment of the precision of the measurements by evaluating the spread or range of values obtained.

2. Accuracy: While the teacher already knows the mass of the object is 25 g, the purpose of the exercise is to assess the accuracy of the measurements performed by the students. By comparing the measured values from each group to the known value, the teacher can evaluate the accuracy of the measurements and identify any systematic errors or biases.

3. Averaging: Taking multiple measurements allows for the calculation of an average value, which tends to be a more reliable representation of the true value. By averaging the measurements from all the groups, the teacher can obtain a more accurate estimate of the mass of the object.

4. Statistical Analysis: With multiple measurements, the teacher can perform statistical analysis on the data, such as calculating measures of central tendency (mean, median) and measures of dispersion (standard deviation), to further assess the quality and reliability of the measurements.

Overall, dividing the class into groups and assigning them the task of measuring the mass of the same object multiple times promotes scientific inquiry, encourages critical thinking, and helps students understand the importance of repeated measurements in obtaining accurate and reliable data. It also provides an opportunity to discuss the concepts of precision, accuracy, and the role of statistical analysis in scientific investigations.

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Answer:

Explanation: the answer is in the picture

Answer:

[tex]\huge\boxed{\sf V_1=0.16 \ L}[/tex]

Explanation:

Initial Molarity =[tex]M_1[/tex] = 6.00 M

Final Volume = [tex]V_2[/tex] = 0.32 L

Final Molarity = [tex]M_2[/tex] = 3.0 M

Initial Volume = [tex]V_1[/tex] = ?

[tex]M_1V_1=M_2V_2[/tex]

Put the given data in the above formula,

Finding initial volume.

[tex]6 \times V_1=0.32 \times 3\\\\6 \times V_1 = 0.96\\\\Divide \ both \ sides \ by \ 6\\\\V_1=0.96/6\\\\V_1=0.16 \ L\\\\\rule[225]{225}{2}[/tex]

The molarity of the 750 ml solution of BaI₂ was calculated to be 0.787 M.

413 grams of BaI₂corresponds to 1.05 moles and 750 ml of water corresponds to 0.75 liters of water. So the molarity of the solution is calculated as

1.05* 0.75= 0.787 moles.

24) Thus the molarity of the solution is 0.787 M.

25) P₂O₇ is a covalent compound. Both phosphorous and oxygen have similar electronegativity.

SnBr₂ is ionic as the electronegativity difference between the two is less.

Fe(OH)₂ is an ionic compound.

Cl₃O₈ is a covalent compound.

26) (NH₄)₂CO₃ is highly soluble in water while Fe(OH)₂ is insoluble in water. CaOH is poorly soluble in water while PbCl₂is only sparingly soluble in water.

27) In the given reaction FeS is formed as the precipitate and it is highly insoluble in water while the KCl is dissolved in the aqueous solution.

In the second reaction, ZnCl₂ is soluble as a part of the aqueous solution while strontium sulfate forms the precipitate.

28) In salt water salt is the solute and water is the solvent.

29) Air pressure is lower in a higher atmosphere. The pressure is 0.65 atm and the temperature is -15 degrees at the altitude where the balloon has risen. As the balloon rises, the external pressure decreases and the balloon volume increases. However, the internal pressure or ballon volume remains the same.

30) With an increase in the temperature of a substance, the kinetic energy of the substance increases too.

31) With an increase in the pressure, volume decreases while with a pressure decreases volume increases.

32) If the temperature of a gas increases the pressure also increases.

33) When the plunger is pushed in, the air pressure increases. This pushes the bubbles out and reduces the size of the marshmallow. When the plunger is pushed out, the air pressure decreases, causing the marshmallow to expand.

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