Question 1

The average adult exhales about 1.0 kg of carbon dioxide each day.How much oxygen is needed in metabolizing glucose (C₆H₁₂O₆,180 g/mol)to make that much carbon dioxide?

Accepted Answer

The answer of The average adult exhales about 1.0 kg...

Question 2

The combustion of butane (C₄H₁₀)forms carbon dioxide and water.What is the stoichiometric coefficient for oxygen in the balanced equation when 1 mol of butane undergoes combustion?

Accepted Answer

The balanced chemical equation for the combustion of butane is:

2C4H10 + 13O2 → 8CO2 + 10H2O

From this equation, we can see that 13 moles of oxygen are required to completely combust 2 moles of butane. Therefore, the stoichiometric coefficient for oxygen when 1 mole of butane undergoes combustion is:

13/2 = 6.5

However, stoichiometric coefficients must be integers, so we round up to the nearest whole number, which is 7.

Therefore, the answer is C) 11.

Question 3

During a fermentation process,sucrose (C₁₂H₂₂O₁₁)can react with water to form ethanol (C₂H₅OH)and carbon dioxide gas.What is the sum of the coefficients in the balanced chemical equation?

Accepted Answer

The answer of During a fermentation process,sucrose (C₁₂H₂₂O₁₁)can react with...

Question 4

Identify the set of stoichiometric coefficients that balance the reaction equation for the combustion of octane. C₈H₁₈ + O₂(g)$\to$ CO₂(g)+ H₂O

Accepted Answer

The balanced equation is:

2 C8H18 + 25 O2 → 16 CO2 + 18 H2O

The coefficients are: 2, 25, 16, 18. These coefficients represent the ratio of the moles of each substance in the equation, and are the smallest set of whole numbers that balance the equation. Choice D is the only option that includes these coefficients.

Question 5

In a one type of fuel cell,methanol (CH₃OH)enters on one side of the unit,and air enters on the other side.Both circulate past electrodes and chemically react to produce carbon dioxide and water along with electricity.Which chemical equation best represents the reaction that occurs?

Accepted Answer

The chemical equation in option B balanced and correctly represents the reaction that occurs in the fuel cell. It shows that 2 molecules of methanol and 3 molecules of oxygen from air react to give 2 molecules of carbon dioxide, 4 molecules of water, and energy in the form of electricity.

Question 6

Sulfuric acid reacts with a vanadium oxide compound according to the following unbalanced reaction.What are the coefficients in the balanced chemical equation in the order in which it is written? H₂SO₄(aq)+ V₂O₃(s)$\to$V₂(SO₄)₃(s)+ H₂O

Accepted Answer

The answer of Sulfuric acid reacts with a vanadium oxide...

Question 7

Extracting copper from sulfide ores can be performed by roasting the ore in oxygen,with a subsequent reaction of copper (I)oxide with carbon.Simplified chemical equations for these steps are shown below.Mathematically combine the two reactions to create an overall balanced equation.Eliminate like terms from your final equation and use the lowest whole-number coefficients possible.Select the statement regarding the overall balanced reaction that is NOT true. 2 Cu₂S(s)+ 3 O₂(g)$\to$ 2 Cu₂O(s)+ 2 SO₂(g) Cu₂O(s)+ C(s)$\to$ 2 Cu(s)+ CO(g)

Accepted Answer

The combined equation is: 2 CuS(s) + 3 O2(g) + C(s) -> 2 Cu(s) + CO2(g) + 2 SO2(g). The coefficients are already reduced to their lowest whole-number values. This equation shows that two moles of copper result when two moles of carbon react, which is true. The other statements are also true except for A, which is false as the balanced equation requires six moles of oxygen gas. Therefore, the correct answer is B.

Question 8

Air bags in cars inflate when an electrical spark activates sodium azide (NaN₃),so that it decomposes to sodium metal and nitrogen gas.In the balanced reaction equation,how many moles of N₂ gas are formed for each mole of NaN₃?

Accepted Answer

The answer of Air bags in cars inflate when an...

Question 9

Which statement,A-D,regarding photosynthesis is NOT correct? In the process of photosynthesis,__________

Accepted Answer

All the statements A-D accurately describe aspects of the photosynthesis process.

Question 10

Chlorine atoms in the atmosphere can react with ozone.Mathematically combine the following two reactions to create an overall balanced equation with the lowest whole-number coefficients and select the statement that is NOT true.All chemical species in the reaction are gas-phase. Cl + O₃ $\to$ ClO + O₂ ClO + O $\to$ Cl + O₂

Accepted Answer

The answer of Chlorine atoms in the atmosphere can react...

Question 11

Potassium perchlorate (KClO₃)oxidizes sucrose (C₁₂H₂₂O₁₁)according to the following unbalanced reaction.What are the coefficients in the balanced chemical equation in the order in which it is written? KClO₃(s)+ C₁₂H₂₂O₁₁(s)$\to$ KCl(s)+ CO₂(g)+ H₂O

Accepted Answer

The answer of Potassium perchlorate (KClO₃)oxidizes sucrose (C₁₂H₂₂O₁₁)according to the...

Question 12

Diesel fuel for automobiles and trucks is a mixture of hydrocarbons that can be modeled by C₁₆H₃₄.Write the balanced reaction equation for the combustion of C₁₆H₃₄,and report the sum of the stoichiometric coefficients.

Accepted Answer

The answer of Diesel fuel for automobiles and trucks is...

Question 13

Glucose (C₆H₁₂O₆)is oxidized by molecular oxygen to carbon dioxide and water.How many O₂ molecules are needed for each molecule of glucose that is oxidized?

Accepted Answer

The balanced chemical equation for the oxidation of glucose (C6H12O6) by molecular oxygen (O2) to produce carbon dioxide (CO2) and water (H2O) is: C6H12O6 + 6O2 -> 6CO2 + 6H2O. Therefore, 6 molecules of O2 are needed for each molecule of glucose.

Question 14

The acid-base reaction between phosphoric acid,H₃PO₄,and calcium hydroxide,Ca(OH)₂,yields water and calcium phosphate.For each mole of calcium phosphate produced by this reaction,how many moles of water are produced?

Accepted Answer

The balanced chemical equation for the reaction between phosphoric acid (H₃PO₄) and calcium hydroxide (Ca(OH)₂) to produce calcium phosphate (Ca₃(PO₄)₂) and water (H₂O) is: 2H₃PO₄ + 3Ca(OH)₂ → Ca₃(PO₄)₂ + 6H₂O. This shows that for each mole of calcium phosphate produced, 6 moles of water are produced.

Question 15

Sulfur dioxide from coal-fired power plants combines with water in the atmosphere to produce acid rain.What is the product when one molecule of SO₂ reacts with one molecule of water?

Accepted Answer

When one molecule of sulfur dioxide (SO2) reacts with one molecule of water (H2O), the product is one molecule of sulfurous acid (H2SO3).

Question 16

What are the stoichiometric coefficients for oxygen and water,respectively,in the balanced chemical reaction equation representing the combustion of butane (C₄H₁₀)?

Accepted Answer

The balanced chemical reaction equation for the combustion of butane is:

2C4H10 + 13O2 → 8CO2 + 10H2O

This equation shows that 13 moles of oxygen and 10 moles of water are produced for every 2 moles of butane consumed. Therefore, the stoichiometric coefficients for oxygen and water, respectively, are 13 and 10. The correct answer is A.

Question 17

Hydrazine (N₂H₄)can decompose to form nitrogen gas and ammonia gas.What is the sum of the coefficients in the balanced chemical equation?

Accepted Answer

The balanced chemical equation is 3N₂H₄ → 4NH₃ + N₂. The sum of the coefficients is 3 + 4 + 1 = 8.

Question 18

In a demonstration of the complete combustion of propane (C₃H₈)with oxygen (O₂),several balloons were prepared with various proportions by volume of propane and oxygen.The loudest explosion occurred for the balloon with the correct stoichiometric proportions of the gases.Which balloon had the loudest explosion?

Accepted Answer

The answer of In a demonstration of the complete combustion...

Question 19

In an aqueous solution under basic conditions,ozone (O₃)reacts with iodide (I^-)and water to form iodine (I₂),hydroxide (OH^-),and oxygen (O₂).What is the sum of the stoichiometric coefficients in the balanced reaction equation? O₃(g)+ I^-(aq)+ H₂O $\to$ I₂(aq)+ OH^-(aq)+ O₂(g)

Accepted Answer

The answer of In an aqueous solution under basic conditions,ozone...

Question 20

One form of elemental sulfur is a ring of eight sulfur atoms.How many moles of molecular oxygen are consumed when one mole of this allotrope burns to make sulfur trioxide?

Accepted Answer

The answer of One form of elemental sulfur is a...

Quiz 7: Stoichiometry-Mass Relationships and Chemical Reactions

The average adult exhales about 1.0 kg of carbon dioxide each day.How much oxygen is needed in metabolizing glucose (C₆H₁₂O₆,180 g/mol) to make that much carbon dioxide?

The combustion of butane (C₄H₁₀) forms carbon dioxide and water.What is the stoichiometric coefficient for oxygen in the balanced equation when 1 mol of butane undergoes combustion?

During a fermentation process,sucrose (C₁₂H₂₂O₁₁) can react with water to form ethanol (C₂H₅OH) and carbon dioxide gas.What is the sum of the coefficients in the balanced chemical equation?

In a one type of fuel cell,methanol (CH₃OH) enters on one side of the unit,and air enters on the other side.Both circulate past electrodes and chemically react to produce carbon dioxide and water along with electricity.Which chemical equation best represents the reaction that occurs?

Air bags in cars inflate when an electrical spark activates sodium azide (NaN₃) ,so that it decomposes to sodium metal and nitrogen gas.In the balanced reaction equation,how many moles of N₂ gas are formed for each mole of NaN₃?

Which statement,A-D,regarding photosynthesis is NOT correct? In the process of photosynthesis,__________

Diesel fuel for automobiles and trucks is a mixture of hydrocarbons that can be modeled by C₁₆H₃₄.Write the balanced reaction equation for the combustion of C₁₆H₃₄,and report the sum of the stoichiometric coefficients.

Glucose (C₆H₁₂O₆) is oxidized by molecular oxygen to carbon dioxide and water.How many O₂ molecules are needed for each molecule of glucose that is oxidized?

The acid-base reaction between phosphoric acid,H₃PO₄,and calcium hydroxide,Ca(OH) ₂,yields water and calcium phosphate.For each mole of calcium phosphate produced by this reaction,how many moles of water are produced?

Sulfur dioxide from coal-fired power plants combines with water in the atmosphere to produce acid rain.What is the product when one molecule of SO₂ reacts with one molecule of water?

What are the stoichiometric coefficients for oxygen and water,respectively,in the balanced chemical reaction equation representing the combustion of butane (C₄H₁₀) ?

Hydrazine (N₂H₄) can decompose to form nitrogen gas and ammonia gas.What is the sum of the coefficients in the balanced chemical equation?

One form of elemental sulfur is a ring of eight sulfur atoms.How many moles of molecular oxygen are consumed when one mole of this allotrope burns to make sulfur trioxide?

Quiz 7: Stoichiometry-Mass Relationships and Chemical Reactions

The average adult exhales about 1.0 kg of carbon dioxide each day.How much oxygen is needed in metabolizing glucose (C6H12O6,180 g/mol) to make that much carbon dioxide?

The combustion of butane (C4H10) forms carbon dioxide and water.What is the stoichiometric coefficient for oxygen in the balanced equation when 1 mol of butane undergoes combustion?

During a fermentation process,sucrose (C12H22O11) can react with water to form ethanol (C2H5OH) and carbon dioxide gas.What is the sum of the coefficients in the balanced chemical equation?

Identify the set of stoichiometric coefficients that balance the reaction equation for the combustion of octane. C8H18 + O2(g) →\to→ CO2(g) + H2O

In a one type of fuel cell,methanol (CH3OH) enters on one side of the unit,and air enters on the other side.Both circulate past electrodes and chemically react to produce carbon dioxide and water along with electricity.Which chemical equation best represents the reaction that occurs?

Sulfuric acid reacts with a vanadium oxide compound according to the following unbalanced reaction.What are the coefficients in the balanced chemical equation in the order in which it is written? H2SO4(aq) + V2O3(s) →\to→ V2(SO4) 3(s) + H2O

Air bags in cars inflate when an electrical spark activates sodium azide (NaN3) ,so that it decomposes to sodium metal and nitrogen gas.In the balanced reaction equation,how many moles of N2 gas are formed for each mole of NaN3?

Which statement,A-D,regarding photosynthesis is NOT correct? In the process of photosynthesis,__________

Potassium perchlorate (KClO3) oxidizes sucrose (C12H22O11) according to the following unbalanced reaction.What are the coefficients in the balanced chemical equation in the order in which it is written? KClO3(s) + C12H22O11(s) →\to→ KCl(s) + CO2(g) + H2O

Diesel fuel for automobiles and trucks is a mixture of hydrocarbons that can be modeled by C16H34.Write the balanced reaction equation for the combustion of C16H34,and report the sum of the stoichiometric coefficients.

Glucose (C6H12O6) is oxidized by molecular oxygen to carbon dioxide and water.How many O2 molecules are needed for each molecule of glucose that is oxidized?

The acid-base reaction between phosphoric acid,H3PO4,and calcium hydroxide,Ca(OH) 2,yields water and calcium phosphate.For each mole of calcium phosphate produced by this reaction,how many moles of water are produced?

Sulfur dioxide from coal-fired power plants combines with water in the atmosphere to produce acid rain.What is the product when one molecule of SO2 reacts with one molecule of water?

What are the stoichiometric coefficients for oxygen and water,respectively,in the balanced chemical reaction equation representing the combustion of butane (C4H10) ?

Hydrazine (N2H4) can decompose to form nitrogen gas and ammonia gas.What is the sum of the coefficients in the balanced chemical equation?

In an aqueous solution under basic conditions,ozone (O3) reacts with iodide (I-) and water to form iodine (I2) ,hydroxide (OH-) ,and oxygen (O2) .What is the sum of the stoichiometric coefficients in the balanced reaction equation? O3(g) + I-(aq) + H2O →\to→ I2(aq) + OH-(aq) + O2(g)

One form of elemental sulfur is a ring of eight sulfur atoms.How many moles of molecular oxygen are consumed when one mole of this allotrope burns to make sulfur trioxide?

The average adult exhales about 1.0 kg of carbon dioxide each day.How much oxygen is needed in metabolizing glucose (C₆H₁₂O₆,180 g/mol) to make that much carbon dioxide?

The combustion of butane (C₄H₁₀) forms carbon dioxide and water.What is the stoichiometric coefficient for oxygen in the balanced equation when 1 mol of butane undergoes combustion?

During a fermentation process,sucrose (C₁₂H₂₂O₁₁) can react with water to form ethanol (C₂H₅OH) and carbon dioxide gas.What is the sum of the coefficients in the balanced chemical equation?

In a one type of fuel cell,methanol (CH₃OH) enters on one side of the unit,and air enters on the other side.Both circulate past electrodes and chemically react to produce carbon dioxide and water along with electricity.Which chemical equation best represents the reaction that occurs?

Air bags in cars inflate when an electrical spark activates sodium azide (NaN₃) ,so that it decomposes to sodium metal and nitrogen gas.In the balanced reaction equation,how many moles of N₂ gas are formed for each mole of NaN₃?

Diesel fuel for automobiles and trucks is a mixture of hydrocarbons that can be modeled by C₁₆H₃₄.Write the balanced reaction equation for the combustion of C₁₆H₃₄,and report the sum of the stoichiometric coefficients.

Glucose (C₆H₁₂O₆) is oxidized by molecular oxygen to carbon dioxide and water.How many O₂ molecules are needed for each molecule of glucose that is oxidized?

The acid-base reaction between phosphoric acid,H₃PO₄,and calcium hydroxide,Ca(OH) ₂,yields water and calcium phosphate.For each mole of calcium phosphate produced by this reaction,how many moles of water are produced?

Sulfur dioxide from coal-fired power plants combines with water in the atmosphere to produce acid rain.What is the product when one molecule of SO₂ reacts with one molecule of water?

What are the stoichiometric coefficients for oxygen and water,respectively,in the balanced chemical reaction equation representing the combustion of butane (C₄H₁₀) ?

Hydrazine (N₂H₄) can decompose to form nitrogen gas and ammonia gas.What is the sum of the coefficients in the balanced chemical equation?