The thermochemical equation for the combustion of butane is:
C₄H₁₀(g) + 6.5 O₂(g) ⇒ 4 CO₂(g) + 5 H₂O(g) ΔH = -2877.5 kJ
It informs us of the entalphy of the reaction and it includes the states of aggregation.
What is a thermochemical equation?A thermochemical equation is a balanced stoichiometric chemical equation that includes the enthalpy change, ΔH.
Step 1: Write the balanced equation for the complete combustion of butane.C₄H₁₀ + 6.5 O₂ ⇒ 4 CO₂ + 5 H₂O
Step 2: Write the thermochemical equation.To the previous equation, we will add the enthalpy change and the states of agregation.
C₄H₁₀(g) + 6.5 O₂(g) ⇒ 4 CO₂(g) + 5 H₂O(g) ΔH = -2877.5 kJ
The thermochemical equation for the combustion of butane is:
C₄H₁₀(g) + 6.5 O₂(g) ⇒ 4 CO₂(g) + 5 H₂O(g) ΔH = -2877.5 kJ
It informs us of the entalphy of the reaction and it includes the states of aggregation.
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Which of these has an oxidation number of zero (0)? Cal2, Ca CaS, Ca3N2
Ca is the correct answer. Maybe
what is the difference between bacteria and cancer cells
When hydrogen is used in a fuel cell, the only waste product is/are __________
Answer:
water
Explanation:
The only by-products from combining hydrogen and oxygen in a fuel cell are water and heat, so hydrogen fuel cells do not emit greenhouse gases or other air pollutants as engines that use fossil fuels do.
An aqueous solution turns litmus red. The ph of this solution could be
If an aqueous solution turns litmus red, the pH of the solution could be the range of 1 - 6.
What is an acid?An acid is a substance that is capable of producing only hydrogen ions (H+) when dissolved in water.
An acid posseses other unique characteristics and are as follows:
Acids are corrosive in their concentrated formAcids turn blue litmus redAcids are sour to tasteThe pH range of an acidic substance is between 1-6.
Therefore, if an aqueous solution turns litmus red, the pH of the solution could be the range of 1 - 6.
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Can someone please help me? :( giving brainliest
Answer:
A and C
Explanation:
I chose these answers because a longer range of time would give a better representation of the climate.
Hope this helps! Please let me know if you need more help or think my answer is incorrect. Brainliest would be MUCH appreciated. Have a wonderful day!
A mixture of 0.197 mol CO2 and 0.00278 mol H2O is held at 30.0 degrees celsius with a pressure of 2.50 atm. What is the partial pressure of each gas?
Considering the Dalton's partial pressure, the partial pressure of CO₂ is 2.465 atm and the partial pressure of H₂O is 0.035 atm.
Dalton's lawThe pressure exerted by a particular gas in a mixture is known as its partial pressure.
So, Dalton's law states that the total pressure of a gas mixture is equal to the sum of the pressures that each gas would exert if it were alone:
[tex]P_{T} =P_{1} +P_{2} +...+P_{n}[/tex]
where n is the amount of gases in the mixture.
Dalton's partial pressure law can also be expressed in terms of the mole fraction of the gas in the mixture. The mole fraction is a dimensionless quantity that expresses the ratio of the number of moles of a component to the number of moles of all the components present.
So in a mixture of two or more gases, the partial pressure of gas A can be expressed as:
[tex]P_{A} =x_{A} P_{T}[/tex]
Partial pressure of CO₂ and H₂OIn this case, you know:
[tex]n_{CO_{2} }[/tex]= 0.197 moles[tex]n_{H_{2}O }[/tex]= 0.00278 moles[tex]n_{T }=n_{CO_{2} }+n_{H_{2}O }[/tex]= 0.197 moles + 0.00278 moles= 0.19978 moles[tex]P_{T}= 2.50 atm[/tex]Then:
[tex]x_{CO_{2}} =\frac{n_{CO_{2}} }{n_{T} }=\frac{0.197 moles}{0.19978 moles} = 0.986[/tex][tex]x_{H_{2}O} =\frac{n_{H_{2}O} }{n_{T} }=\frac{0.00278 moles}{0.19978 moles} =0.014[/tex]Replacing in the Dalton's law:
[tex]P_{CO_{2} } =x_{CO_{2}} P_{T}[/tex]
[tex]P_{CO_{2} } =[/tex] 0.986× 2.50 atm
[tex]P_{CO_{2} } =[/tex] 2.465 atm
[tex]P_{H_{2}O } =x_{H_{2}O} P_{T}[/tex]
[tex]P_{H_{2}O } =[/tex] 0.014× 2.50 atm
[tex]P_{H_{2}O } =[/tex] 0.035 atm
Finally, the partial pressure of CO₂ is 2.465 atm and the partial pressure of H₂O is 0.035 atm.
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Under which set of conditions do real gases deviate the most from the ideal gas law?
Answer:
In summary, a real gas deviates most from an ideal gas at low temperatures and high pressures. Gases are most ideal at high temperature and low pressure. What factors attributes to the deviation of gas law from the ideal gas theory?
Explanation:
Real gases deviate the most from the ideal gas law under low temperature and high pressure.
What is the ideal gas law?
Ideal gas laws say about hypothetical gases, the collision between the molecules of an ideal gas would be perfectly elastic.
There are three variables of an ideal gas, absolute temperature, pressure, and volume.
PV = nRT
Thus, real gases deviate the most from the ideal gas law under low temperature and high pressure.
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How many atoms of N are in 137. 0 grams of N2O3? A. 1. 085 × 1023 B. 1. 802 × 1023 C. 5. 985 × 1023 D. 2. 171 × 1024 E. 3. 604 × 1024.
The number of atoms of nitrogen present in 137 grams of N₂O₃ in 2.1 × 10²⁴.
What is Avogadro's number?Avogadro's number is that number which tells about the number of atoms or entities of any substance present in one mole of any substance, i.e. 1 mole = 6.022 × 10²³
First we have to convert mass of N₂O₃ to moles by using the below formula:
n = W/M, where
W = given mass = 137g
M = molar mass = 76g/mol
Moles of N₂O₃ = 137 / 76 = 1.8mol
From the stoichiometry of the mass and formula it is clear that:
In 76g of N₂O₃ = 2 moles of Nitrogens are present
In 137g of N₂O₃ = 2/76×137=3.6 moles of Nitrogens are present
No. of N atoms in 3.6 moles = 3.6 × 6.022 × 10²³ = 2.1 × 10²⁴
Hence option (D) is correct.
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Which acid should be stored in plastic containers rather than in glass ones?
Answer:
sulphuric acid and nitric acid
Explanation:
The acids that should be stored in plastic containers rather than in glass ones are hydrofluoric acid, phosphoric acid, sulfuric acid, etc.
What are acids?
Acids are those solutions that are sour in taste and have lower pH to 7.
Hydrofluoric acid is highly corrosive, made up of hydrogen and fluorine.
Phosphoric acid is an important oxygen of phosphorus.
Thus, the acids that should be stored in plastic containers rather than in glass ones are hydrofluoric acid, phosphoric acid, sulfuric acid, etc.
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A gas occupies a volume of 0.7 L at 10.1 kPa. What volume will the gas occupy at 101 kPa?
Answer:
7L
Explanation:
Divide 101 by 10.1(kPa) and you get 10.
10 x .7 = 7
The concept Boyle's law is used here to determine the new volume of gas . Boyle’s law was put forward by the Anglo-Irish chemist Robert Boyle in the year 1662. Here the new volume of the gas is 0.07 L.
What is Boyle's law?A gas law known as Boyle's law asserts that a gas's pressure is inversely proportional to its volume when it is held at a fixed temperature and of a given mass. To put it another way, as long as the temperature and volume of the gas remain constant, the pressure and volume of the gas are inversely proportional to one another.
For a gas, the relationship between volume and pressure (at constant mass and temperature) can be expressed mathematically as follows.
P = k*(1/V) ⇒ PV = k
For two different gases, the equation is:
P₁V₁ = P₂V₂
V₂ = P₁V₁ / P₂
10.1 × 0.7 / 101 = 0.07 L
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HELPSPEPEP ILL BRAINLIST!!!
Explain the scale of recycling that is currently present in Australia and predict how traditional industries could be affected by an increase in recycling in Australia.
make it short and simple pls. ty.
Answer:
Negative impacts include: noise, air and odour pollution from collection and reprocessing facilities; costs to set up recycling infrastructure and education materials for new areas; and costs associated with innovations and technologies, which are likely to be passed on to end consumers in product prices.
Explanation:
1. What is the percent increase in carbon dioxide in the atmosphere between 2015 and 2020? Between 1960 and 2020? SHOW YOUR WORK!!!!
Answer:An accompanying WMO report on greenhouse gas concentrations shows that 2015-2019 has seen a continued increase in carbon dioxide (CO2) levels and other key greenhouse gases in the atmosphere to new records, with CO2 growth rates nearly 20% higher than the previous five years.
Explanation:That's because the annual growth rate of atmospheric carbon dioxide has roughly tripled, from 0.6 ppm per year in the early 1960s to an average 2.1 ppm during the past 10 years. At Mauna Loa, carbon dioxide concentrations in 2015 jumped by 3.05 ppm
C + 2H2
CH4
For the reaction shown here, predict how many moles of methane can be produced from 72 grams of carbon in the presence of excess hydrogen gas.
A) 1
B) 2
C) 4
D) 6
Answer:
D
Explanation:
12g of carbon produces....... 1 mole of methane
72g of carbon will produce..1÷12 × 72 = 6moles
what is The relationship between a carnivore and an herbivore can be stated as
A
parasite and host
B
predator and prey
C
prey and predator
D
scavenger and parasite
What is the effect Coriolis effect
The Coriolis effect is a natural phenomenon in which objects appear to be deflected as they travel around and above the Earth. The Earth is always rotating, or spinning, from west to east. It completes a full rotation every 24 hours. The Coriolis effect is caused by this rotation.
The molar mass of sucrose (C12H22O11) is 342. 3 g/mol. A chemist has a 0. 500-mol sample of sucrose. What is the mass, in grams, of this sample? 171 grams 342 grams 500 grams 684 grams.
Mass is the weight of the compound or the molecule in a sample that is given in grams. The mass of sucrose in the sample is 171 gms.
What is mass?The mass of the compound is the product of the molar mass of the compound and the number of moles of the compound in a sample.
Given,
The molar mass (m.w.t) of sucrose = 342.3 g/mol
Number of moles (n) of sucrose = 0.500 moles
The mass of sucrose is calculated as:
[tex]\begin{aligned} \rm mass &= \rm molar\; mass \times moles \\\\&= 342.3 \times 0.500\\\\&= 171.15 \;\rm gm\end{aligned}[/tex]
Therefore. the mass of sucrose in the sample is option A. 171 gms.
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When 55.8 g of Fe reacts with Cl2 according to the equation 2Fe + 3Cl2 --> 2FeCl3. How many moles of Cl2 are required to react with all the iron?
2.00 mol
1.00 mol
0.67 mol
1.50 mol
Answer:
1.50 moles
Balanced equation: 2Fe + 3Cl₂ --> 2FeCl₃
find moles of iron:
moles = mass/Mr
moles = 55.8/56
moles = 0.9964 moles
use molar ratio:
2Fe : 3Cl₂
2 : 3
moles of Cl₂ = (0.9964/2)*3 = 1.50 moles
After completing their tests, the students make recommendations on how to increase the final temperature of the
mixture
Based on the data in the table, select if the proposed improvements would increase or decrease the final
emperature of the mixture. Place a check mark in the appropriate box in each row.
Answer: test two
Explanation: it sits in between both
How does the buffer maintain the ph of the solution when an acid is added to it?.
Answer: By reacting with the hydrogen ions.
Explanation:
A students finds a FeNO3 . 3H2O solution with a 1.8 concentration . She uses a a 2 cm wide cuvette in a colorimeter to measure the absorbance. The molar absorptivity of CuSO4 . 5H2O is 42.243 M-1cm-1
What is the Absorbance of the solution?
The absorbance of a solution that has a concentration of 1.8 is 152.75.
How to calculate absorbance?The absorbance of a substance can be calculated using Beer's law equation as follows:
A = εmCl
Where;
A = absorbanceεm = molar absorptivityC = concentration of solutionl = path lengthAccording to this question, the following information are given:
A = ?εm = 42.243 M-1cm-1C = 1.8l = 2cmA = 42.43 × 1.8 × 2
A = 152.75
Therefore, the absorbance of a solution that has a concentration of 1.8 is 152.75.
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What units are appropriate to express specific heat?.
Answer:
joules per gram per degree (J/goC) or calories per gram per degree (cal/goC).
Explanation:
Answer:
Joules, Kelvin, or calories
Explanation:
N2(g)+3H2(g) 2NH3(g)
The equilibrium system described by this equation has
reactant molecule(s)
and
product gas molecule(s).
Considering the definition of chemical equation, the equilibrium system described by this equation has 4 reactant molecules and 2 product gas molecules.
Definition of chemical equationA chemical equation is a symbolic description used to describe the identities and relative quantities of the reactants and products involved in a chemical reaction.
The information contained in the chemical equation allows us to determine the substances that are transformed or modified in a reaction, called reactants or reagents, and the new substances that originate in a chemical reaction, called products.
The chemical equation must comply with the Law of conservation of matter. That is, the equation must indicate that the number of atoms of the reactants and products is equal on both sides of the reaction and that the charges are also equal.
Number of reactant molecule(s) and product gas molecule(s)In this case you know:
N₂ + 3 H₂ ⇄ 2 NH₃
You can observe that the number of H₂ is 3, while the number of N₂ is 1.
The number of molecules on the reactant side is the sum of hydrogen and nitrogen molecules. Then, the total number of reactant molecule is 4.
The number of product molecules are only the number of NH₃. Then, the number of product molecules are 2.
Finally, the equilibrium system described by this equation has 4 reactant molecules and 2 product gas molecules.
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Answer:
4 and then 2
Explanation:
Please calculate the mass percent of water in the formula: NiSO4.3 H2O
Please help me raise my grade up and I’ll give you brainliest!
Answer:
208.8018 g/Mol you conver the answer by weight and moles
balance the equation
___NaBr + ___ Ca(OH)2 -----> ___CaBr2 + ___NaOH
Answer:
2NaBr + Ca(OH)2 ––> CaBr2 + 2NaOH
what mass of sulfurous acid is produced when 245g of sulfur dioxide is reacted with water?
H₂O + SO₃ = H₂SO₃
The mass of sulfurous acid produced when 245g of sulfur dioxide is reacted with water is 313.8 g
StoichiometryFrom the question, we are to determine the mass of sulfurous acid produced
First, we will write the balaced chemical equation for the reaction
H₂O + SO₂ → H₂SO₃
This means 1 mole of H₂O reacts with 1 mole of sulfur dioxide (SO₂) to produce 1 mole of sulfurous acid (H₂SO₃)
Now, we will determine the number of moles of sulfur dioxide present
Mass of sulfur dioxide present = 245 g
Molar mass of sulfur dioxide = 64.066 g/mol
Using the formula,
[tex]Number \ of \ moles = \frac{Mass}{Molar\ mass}[/tex]
Then,
Number of moles of SO₂ present = [tex]\frac{245}{64.066}[/tex]
Number of moles of SO₂ present = 3.824 moles
This is the number of moles of SO₂ present
From balanced chemical equation
1 mole of H₂O reacts with 1 mole of sulfur dioxide (SO₂) to produce 1 mole of sulfurous acid (H₂SO₃)
Then,
Water (H₂O) will react with the 3.824 moles of sulfur dioxide (SO₂) to produce 3.824 moles of sulfurous acid (H₂SO₃)
∴ The number of moles of sulfurous acid produced is 3.824 moles
Now, for the mass of sulfurous acid produced
Molar mass of sulfurous acid = 82.07 g/mole
Using the formula,
Mass = Number of moles × Molar mass
Mass of sulfurous acid produced = 3.824 × 82.07
Mass of sulfurous acid produced = 313.8 g
Hence, the mass of sulfurous acid produced is 313.8 g
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hello people ~
A proton donor is a chemical that
a) protongenic
b) protophilic
c) amphoteric
d) amphiprotic
Answer:
Amphiprotic
Explanation:
These chemicals are too independentThey can either donate or accept a lone pair of protons .So they can act as base and acidDuring this chemical reaction energy is absorbed. In the chemistry lab, this would be indicated by a decrease in temperature or if
the reaction took place in a test tube, the test tube would feel colder to the touch. Reactions like this one absorb energy because
A) the reaction requires activation energy.
B) the reactants have less potential energy than the products.
C)the reactants have more potential energy than the products.
D)the mass of the products is greater than the mass of the reactants.
Reactions like this one absorb energy because the reactants have less potential energy than the products.
What is an Endothermic reaction?This is the type of reaction in which the reactants absorb heat energy from the surroundings to form products.
This brings about a decrease in the temperature as a result of the reactants having less potential energy than the products thereby making option B the most appropriate choice.
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In a triprotic acid, which ka has the highest value?.
Answer:
The answer is Ka1
▬▬▬▬▬▬▬▬
When it comes to dissociation, Ka1 is fairly the most even-out level, classifying it as a Weak Acid.
What differentiates a weak from a strong acid?They must be fully separable into ions. If that's the case, you are dealing with a Strong acid.
If this is not the case, that would make the acid Weak.
▬▬▬▬▬▬▬▬
In conclusion, I hope this helps you and I hope you have a great day!
The chemical equation below shows the photosynthesis reaction. 6co2 6h2o right arrow. c6h12o6 6o2 the molar mass of carbon dioxide (co2) is 44.01 g/mol. the molar mass of water (h2o) is 18.02 g/mol. a reaction uses 528 g of co2. how many moles of water are used in this reaction? 12.0 moles 72.0 moles 216 moles 528 moles
The moles of water are used in the given reaction between CO₂ & H₂O is 12 moles.
How do we calculate mass from moles?Mass of any substance will be calculated by using their moles as:
n = W/M , where
W = given or required mass
M = molar mass
Given chemical reaction is:
6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂
Moles of 528 g of CO₂ = 528g / 44.01g/mol = 11.99 moles
From the stoichiometry of the reaction, it is clear that:
6 moles of CO₂ = reacts with 6 moles of H₂O
So, 11.99 moles of CO₂ = reacts with 11.99 = 12 moles of H₂O
Hence option (a)is correct i.e. 12 moles.
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Answer:
A
Explanation:
Which of the following radioactive emissions is the least penetrating?
alpha particles
gamma rays
beta particles
Answer:
alpha particles
Explanation:
alpha particles the least penetrating but potentially most damaging and gamma rays the most penetrating. A beta particle, also called beta ray or beta radiation, is a high-energy, high-speed electron or positron emitted by the radioactive decay of an atomic nucleus during the process of beta decay.
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