Calculate the number of molecules in 2.37 g of c3H8 (molar mass 44.11 g/mol)

Considering the definition of STP conditions, 4.83 × 10⁻³ moles of HF will occupy a volume of 0.108192 L at STP.

The STP conditions refer to the standard temperature and pressure. Pressure values at 1 atmosphere and temperature at 0 ° C are used and are reference values for gases, and 1 mole of any gas occupies an approximate volume of 22.4 liters.

In this case, you have 4.83×10⁻³ moles of HF. You can apply the following rule of three: if by definition of STP conditions 1 mole of HF occupies a volume of 22.4 liters, 4.83×10⁻³ moles occupies how much volume?

volume= (4.83×10⁻³ moles ×22.4 L)÷ 1 mole

volume= 0.108192 L

Finally, there is a volume of 0.108192 L at STP.

Learn more about STP conditions:

brainly.com/question/17915431

#SPJ1

The final temperature of the solution is  20 °C.

Given that :

volume of HNO₃ = 0.33 L

molarity = 0.500 M

no. of moles HNO₃ = 0.33 × 0.500

                     = 0.165 mol

moles of Ba(OH)₂ = 0.33 × 0.250

                             = 0.082 mol

Q = ΔH × n

Q = - 52600 J/mol × 0.165 mol

Q = - 8679 J

total volume = 330 mL +330 mL = 660 mL

Density = mass / volume

mass = 1 g/mL × 660 mL

mass = 660 g/mL

now, the change in temperature can be calculated by following formula :

Q = mc ( ΔT )

Q = mc ( T2 - T1 )

- 8679 = 660× 4.184 ( T2 - 18.46 °C)

T2 = 20 °C

Thus, A quantity of 3.30 × 10² mL of 0.500 M HNO3 is mixed with 3.30 × 10² mL of 0.250 M Ba(OH)₂ in a constant-pressure calorimeter of negligible heat capacity. The initial temperature of both solutions is the same at 18.46°C. The heat of neutralization when 1.00 mol of HNO₃ reacts with 0.500 mol Ba(OH)₂ is −56.2 kJ/mol. Assume that the densities and specific heats of the solution are the same as for water (1.00 g/mL and 4.184 J/g · °C, respectively).  the final temperature of the solution is 20 °C.

To learn more about specific heat here

https://brainly.com/question/4312435

#SPJ1

In order to find the pressure in this situation, we will be using the Ideal gas Law, which perfectly correlates these informations, the formula for this Law is:

PV = nRT

Where:

P = pressure, we want to find it

V = volume, 1.00 L

n = number of moles, we will also find it

R = is the gas constant, 0.082

T = 301 K

To find the number of moles, we need to use the mass provided in the question and also the molar mass of CO2, 44.01g/mol

44.01g = 1 mol

7.94g = x moles

x = 0.180 moles of CO2

Now we can use the ideal gas formula:

P * 1.00 = 0.180 * 0.082 * 301

P = 4.44 atm

In order to calculate this question, we will use the reaction quotient Q, which has a very similar formula as the equilibrium formula, but this Q can be calculated not just in equilibrium (where Q = K) but in any part of the reaction, so K is the equilibrium, and Q is what is used to see where the reaction will shift towards until it reaches equilibrium, we can have three possible outcomes:

Q = K, the reaction is already in equilibrium

Q > K, the reaction will proceed in the reverse direction

Q < K, the reaction will proceed in the forward direction

Let's set up the formula:

Q = [products]/[reactants], the brackets mean Concentration of each compound. Now adding our compounds

Q = [BrCl]^2/[Br2]*[Cl2], the BrCl is raised to 2 because we have 2 BrCl in the reaction, this is a rule for the equilibrium formula, we use the coefficient in front of the compound and raise its concentration to this number

Now we need the concentration of each compound, to find it we will use the Molarity formula

M = n/V

M = 0.15/2

M = 0.075M, notice that since we have the same number of moles and volume for every compound, we will have the same concentration for every compound, going back to our formula

Q = [0.075]^2/[0.075][0.075]

Q = 1.0

Since K = 7.0 and Q = 1.0

K > Q, the reaction will proceed in the forward direction in order to increase the concentration of 2 BrCl in order to finally reach Q=K

At standard pressure, C) gas state of matter is xenon at -111 °C

Xenon is an extremely uncommon, odourless, colourless, tasteless, chemically inert gas. It was thought to be absolutely innocuous until Neil Bartlett published the synthesis of xenon haxafluoroplatinate in 1962. When stimulated by an electrical discharge, xenon generates blue light in a gas-filled tube.

Noble gases, which are most commonly encountered as monatomic gases, have entirely filled outer electron shells and hence have little desire to react with other elements, resulting in relatively few compounds with other elements.

In its +6 oxidation state, xenon trioxide is an unstable molecule. It is a highly potent oxidising agent that progressively liberates oxygen from water when exposed to sunshine. When it comes into touch with organic materials, it becomes highly explosive.

learn more about Xenon refer

https://brainly.com/question/2085589

#SPJ13

Heating to constant mass is done to retain the constant mass of the sample so that its weight remains the same and does not affect the reading throughout the experiment.

To learn more about how the mass number is calculated for an element click below:

https://brainly.com/question/295273

#SPJ4

Answer:

b Different amounts of food samples were used.

Explanation:

The mass of the two samples needs to be the same in order for the test to be accurate.

Chemistry => Measurements => Significant Figures

Significant figures correspond to the number of digits in a number. We have to take into account the following:

• Zeros at the beginning of a number or at the end are not counted as digits, but zeros in between the number should be counted.

• When we write a number in scientific notation, the 10 that accompanies the number should not be counted.

Following these indications, let's count the significant figures of each given number:

In summary, we have the answer will be:

1SFs

3.00 m

4.0x10^3 mL

3SFs

50 100 00g

80.10 mL

60.4 °C

6SFs

9018.17 kg

Some atoms are neutral and others have positive or negative charges.

The charged atoms are called "ions".

- If the ion has positive charge, it is called cation.

- If the ion has negative charge, it is called anion.

Ions can be identified by their charge, for example:

- Cations: Na^+1, K^+1, Mg^+2

- Anions: Cl^-1, Br^-1

2. Which is the volume of 3.20 moles of O₂?

We are told that at STP one mol of any gas occupies 22.4 L. We will use that relationship to find the volume occupied by 3.20 moles of O₂.

1 mol of O₂ = 22.4 L

volume of O₂ = 3.20 moles of O₂ * 22.4 L/(1 mol of O₂)

volume of O₂ = 71.7 L

Answer: 3.20 moles of O₂ occupies 71.7 L

7. Which is the volume of 100. g of O₂?

In this case we will use the same relationship, but we are given grams instead of moles. So first we have to convert the mass in grams into moles. To do that we use the molar mass of O₂.

atomic mass of O = 16.00 amu

molar mass of O₂ = 2 * 16.00

molar mass of O₂ = 32.00 g/mol

Once that we know that the mass of 1 mol of O₂ is 32.00 g, we can find the number of moles that we have in 100. g of it.

moles of O₂ = mass of O₂ /(molar mass of O₂)

moles of O₂ = 100. g/(32.00 g/mol)

moles of O₂ = 3.13 moles

Finally we can find the volume that 3.13 moles of O₂ occupies (remember that 1 mol of any gas occupies 22.4 L at STP).

volume of O₂ = 3.13 moles * 22.4 L/(1 mol)

volume of O₂ = 70.1 L

Answer: 100. g of O₂ occupies 70.1 L

This organic compound has in its structure the next element: C, H, and O

45.27% C

4.43 % H

The rest 100%-45.27%-4.43 = 50.3 % O

-----------------------------------------------------------------------------------------------------------------

The empirical formula of a chemical compound is the simplest whole-number ratio of atoms present in a compound.

Procedure:

Step 1)

We convert % into grams (g). Let's assume we have a 100g sample. Therefore,

45.27 % C = 45.27 g

4.43 % H = 4.43 g

50.3 % O = 50.3 g

Step 2)

We calculate the number of moles of each element. To do this, we need every atomic mass

For C)

For H)

For O)

Step 3)

We divide all moles by the smallest one of them (3.14 moles of O)

For C) 3.767 moles/3.14 moles = 1.19 = 1 (we need integer numbers)

For H) 4.43 moles/3.14 moles = 1.41 = 1

For O) 3.14 moles/3.14moles = 1

The empirical formula is CHO

To determine how the formula will be when combining two ionic species, we must look at the oxidation states of the ions. The Na ion has an oxidation state of +1 and the ClO4 ion has an oxidation state of -1.

The number of ions must be such that the total sum of the oxidation states is zero. If we have a Na+1 ion and a ClO4(-1) ion, the sum will be equal to zero. So there must be one ion of each species in the molecule.

Therefore, the answer will be: NaCIO4

The n and l values and the number of orbitals for sublevel 5g is :

5g shell , n= 5 subshell g , l = 4, Number of orbitals for sublevel = 9.

There are total four quantum numbers:

1) Principal quantum number , n

2) Angular quantum number , l

3) Magnetic quantum number , ml

4) spin quantum number , ms

For 5g shell, n = 5

subshell g , l = 4     ....0 - s , 1 - p , 2 - d, 3 - f, 4 -g

number of orbitals in subshell = (2l + 1)  ( 2×4 + 1) = 9

Thus,  The n and l values and the number of orbitals for sublevel 5g is :

5g shell , n= 5 subshell g , l = 4, Number of orbitals for sublevel = 9.

To learn more about quantum numbers here

https://brainly.com/question/14650894

#SPJ1

Answer: the final volume of the balloon is 2.26 x 10^3 mL

Explanation:

The question requires us to determine the new volume of a balloon, given the initial and final conditions.

The following information was provided by the question:

initial temperature = T1 = 24 °C = 297.15 K

initial volume = V1 = 443 mL

initial pressure = P1 = 745 mmHg = 0.980 atm

final temperature = T2 = -95 °C = 178.15 K

final pressure = P2 = 0.115 atm

To solve this problem, we'll need to apply the equation of ideal gases to calculate the number of moles of gas in the balloon, and then use this value and the final temperature and pressure provided to determine the final volume,

The equation of ideal gases can be written as:

And we can rearrange it to calculate the number of moles:

Applying the values provided by the question:

Now, we can rearrange the equation of ideal gases to calculate the volume:

And, applying the values provided and the number of moles as calculated:

Therefore, the final volume of the balloon is 2.26 x 10^3 mL.

2 oxygen ions

Oxygen is a non-metal with an atomic number of 8. The electronic configuraton of the element is given as:

If a an unknown metal with a charge of 4 combines with oxygen, the required reaction will be:

Since oxygen is in group VI of the periodic table and has a oxidation number of -2, to form a neutral compound with charge of +4, this means that 2 oxygen ion will combine with the metal to form a neural compound MO2

Given the balanced chemical reaction expressed as:

A Redox reaction is a reaction that involves the transfer of electrons and changes in the oxidation state between the elements.

The given chemical equation is therefore an oxidation-reduction reaction since it involves a change in the oxidation state of the elements.

Determine the moles of Au₂O₃

According to stochiometry, you can see that 2 moles of Gold(III)oxide produce 4 moles of Gold. Hence the moles of Gold produced will be:

Determine the mass of Gold.

Next is determining the mole of Oxygen

According to stochiometry, you can see that 2 moles of Gold(III)oxide produce 3 moles of Oxygen. Hence the moles of Oxygen produced will be:

Determine the mass of oxygen produced

Hence the mass of oxygen produced is 0.543 grams

In this question, we have to classify what is a redox reaction, and as the name suggests, we have a reduction and an oxidation reaction occurring in this type of reaction, where one element will lose electrons, or will be oxidized, and another element will gain electrons or will be reduced. Therefore the best answer will be letter C

There are many legends of the North Star that have been told over the years by different civilizations and of them is a mythical story told about the existence of the star.

It is said that it is a little dot left behind after God created the stars and based on the fact that the dot was not like the other stars as it was almost an afterthought and then it came to the attention of Luminaria who granted the dot its wish and it became a real star like the others and became the Star of Bethlehem.

Hence, it can be seen that the given legend and mythical stories are just one of the many ways humans try to understand the phenomena of astrology and how they attach certain significance to it.

With this in mind, it is very clear to see that the North Star is a special star.

Read more about the North Star here:

https://brainly.com/question/1130377

#SPJ1

Radon is a naturally-occuring radioactive gas that can cause lung cancer to those who are near it. Radon is also an inert, colorless and odorless gas. Although it is dangerous and hazardous, it disperses rapidly and, usually, is not a health issue. Answer is Radon

It is the same for every sample of every substance present describes an intensive property of matter.

The correct option is C.

An intense property is a greater stability of a system that is independent of the system's size or the volume of its constituent elements. Based on the definitions, internal energy, volume, or density are extensive properties while pressure, temperature, and densities are intensive properties.

Because of the small range of densities present among the samples, density is an intense attribute. Concentrations were roughly the same regardless of the beginning mass. The data show that density is an intense attribute of matter because it is independent of the amount of substance present.

To know more about Intensive property visit:

https://brainly.com/question/13733851

#SPJ13

The complete question is

Which statement describes an intensive property of matter?

A-It is the same for every sample of a single substance.

B-It depends on how a substance was formed.

C-It is the same for every sample of every substance.

D-It depends on the amount of substance present.

Answer:

A

Explanation:

In-house forensics allows companies to work faster, cheaper, and potentially better than law enforcement. Labs at large companies are more likely than police labs to have high-tech tools and the latest forensics software, said Seigfried-Spellar.

To write the numbers with the specific number of significant figures, we need to remember that zeros to the left don't count as a significant figure and also that we can add zeros to the right to add significant figures to the numbers.

1) 1.5408 to 3 significant figures, we start counting from left to right, so we will maintain the numbers until the second decimal place, the "8". Since the next is "0", the rounding is "8", so the number is 1.54.

2) Here is similar, but since we don't have decimal places, we need to put the zeros in place of the numbers we are rounding. Since we want 2 significant figures, we will maintain only the first two. However, since the third is greater than 5, we need to round up, so the number is 4400.

3) To get this, we will maintain the zeros to the elft, but they don't count, so we start counting from the "1". Since the third number is less than 5, we round down, so the number is 0.019.

4) Now, here we have an example we need to add zeros. The way it is, 0.5 has only 1 significant figure, so we need to add 3 more zeros to the right to get to 4 significant figures. The number is 0.5000.

5) Here, is the same as item 3, but we want 3 significant figures and since the fourth is greater than 5 we round it up. So, the number is 0.066.

The boiling point of the solution is 80.93°C.

We know that the boiling point has to do with the temperature at which the pressure inside the system is the same as the atmospheric pressure. Now we know that the boiling point of the pure benzene is 80.1 °C.

Also;

ΔT = K m i

ΔT = boiling point elevation

K = boiling point constant

m = molality

i = Van Hoff factor

ΔT = 2.53°C /m * 0.33 m * 1

ΔT =  0.83°C

Boiling point of the solution =  0.83°C + 80.1 °C

= 80.93°C

Learn more about boiling point:https://brainly.com/question/2153588

#SPJ1

The reactants are the compounds before the arrow and the products are after the arrow. Just as they show us, the oxygen atoms in the reagents will bJust as the reaction shows, the oxygen atoms in the reactants will be:

Answer: There are 7 atoms of oxygen in the reactants

When something heats up energy is absorbed from another system and when something cooler down energy is released to another system.

When a reaction releases heat, it is classified as exothermic. The absorption of heat in a reaction makes it endothermic.

Answer:

In a nuclear fusion reaction, two small, light 'nuclei' (hydrogen atoms) combine under extreme 'temperature' and pressure to form one larger, heavier nucleus (helium).

The question requires us to calculate the amount of moles of water that we would have in 5.3x10^26 molecules of water.

To solve this problem, we'll need to consider the Avogadro Number: this number states the amount of particles (electrons, ions, atoms, molecules etc.) in one mole of a substance. The Avogadro Number corresponds to 6.022 x 10^23 particles per mol.

Considering the Avogadro number and the number of molecules provided by the question, we can write:

6.022 x 10^23 molecules of water -------------------- 1 mol of water

5.3 x 10^26 molecules of water ------------------------ x

Solving for x, we'll have:

Therefore, there are 8.8 x 10^2 moles of water in 5.3 x 10^26 molecules of water.

Answer:

Explanation:

The chemical reaction talks about the synthesis of calcium carbonate

It is from the reaction between sodium carbonate and calcium chloride

Let us write the equation of reaction as follows:

Firstly, we want to get the expected mass of calcium carbonate

This speaks about getting the theoretical yield based on the equation of reaction

From the data collected, 90 ml of 0.20 M (mol/L) of sodium carbonate gave calcium carbonate

We need to get the actual number of moles of sodium carbonate that reacted

We can get this by multiplying the volume by the molarity (kindly note that we have to convert the volume to Liters by dividing by 1000)

Thus, we have it as:

Hence, we see that 0.009 moles of sodium carbonate reacted theoretically

Since 1 mole of sodium carbonate gave 1 mole calcium carbonate, it is expected that 0.009 mole of sodium carbonate will give 0.009mole of calcium carbonate

What we have to do now is to get the theoretical grams of calcium carbonate produced

That would be the product of the number of moles of calcium carbonate and its molar mass

The molar mass of calcium carbonate is 100 g/mol

The theoretical yield (expected mass) is thus:

Finally, we proceed to get the percentage yield which is calculated using the formula below:

The actual yield is the observed mass which is given as 0.88 g

The percent yield is thus: