Under appropriate conditions, nitrogen and hydrogen undergo a combination reaction to yield ammonia: N2 (g)+ 3 H2 (g)→ 2NH3 (g) A 7.1-g sample of N2 requires __________ g of H2 for complete reaction.

A) 0.51 B) 0.76 C) 1.2 D) 1.5 E) 17.2 A) 0.51 B) 0.76 C) 1.2 D) 1.5 E) 17.2 D

When the following equation is balanced, the coefficient of H2SO4 is __________. H2SO4 (aq)+ NaOH (aq)→ Na2SO4 (aq)+ H2O (l)

A) 1 B) 2 C) 3 D) 4 E) 0.5 A) 1 B) 2 C) 3 D) 4 E) 0.5

When the following equation is balanced, the coefficient of HCl is __________. CaCO3 (s)+ HCl (aq)→ CaCl2 (aq)+ CO2 (g)+ H2O (l)

A) 1 B) 2 C) 3 D) 4 E) 0 A) 1 B) 2 C) 3 D) 4 E) 0

How many grams of oxygen are in 45 g of C2H2O2?

A) 8.3 B) 9.3 C) 17 D) 25 E) 31 A) 8.3 B) 9.3 C) 17 D) 25 E) 31

Lead (II)carbonate decomposes to give lead (II)oxide and carbon dioxide: PbCO3 (s)→ PbO (s)+ CO2 (g) __________ grams of lead (II)oxide will be produced by the decomposition of 7.50 g of lead (II)carbonate?

A) 0.41 B) 2.50 C) 0.00936 D) 6.26 E) 7.83 A) 0.41 B) 2.50 C) 0.00936 D) 6.26 E) 7.83

Automotive air bags inflate when sodium azide decomposes explosively to its constituent elements: 2NaN3 (s)→ 2Na (s)+ 3N2 (g) How many grams of sodium azide are required to produce 30.5 g of nitrogen?

A) 1.63 B) 0.726 C) 70.8 D) 47.2 E) 106.2 A) 1.63 B) 0.726 C) 70.8 D) 47.2 E) 106.2

Write the balanced equation for the reaction that occurs when methanol, CH3OH (l), is burned in air. What is the coefficient of oxygen in the balanced equation?

A) 1 B) 2 C) 3 D) 4 E) 3/2 A) 1 B) 2 C) 3 D) 4 E) 3/2

Magnesium burns in air with a dazzling brilliance to produce magnesium oxide: 2Mg (s)+ O2 (g)→ 2MgO (s) When 2.00 g of magnesium burns, the theoretical yield of magnesium oxide is __________ g.

A) 2.00 B) 3.32 C) 0.0823 D) 1.66 E) 6.63 A) 2.00 B) 3.32 C) 0.0823 D) 1.66 E) 6.63

Exam 3: Stoichiometry: Calculations With Chemical Formulas and Equations

A compound that is composed of carbon, hydrogen, and oxygen contains 70.6% C, 5.9% H, and 23.5% O by mass. The molecular weight of the compound is 136 amu. What is the molecular formula?

Free

(Multiple Choice)

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Question 1

Correct Answer:

Verified

One million argon atoms is __________ mol (rounded to two significant figures)of argon atoms.

Free

(Multiple Choice)

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Question 2

Correct Answer:

Verified

Under appropriate conditions, nitrogen and hydrogen undergo a combination reaction to yield ammonia: N₂ (g)+ 3 H₂ (g)→ 2NH₃ (g) A 7.1-g sample of N₂ requires __________ g of H₂ for complete reaction.

Free

(Multiple Choice)

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Question 3

Correct Answer:

Verified

When the following equation is balanced, the coefficient of H₂SO₄ is __________. H₂SO₄ (aq)+ NaOH (aq)→ Na₂SO₄ (aq)+ H₂O (l)

(Multiple Choice)

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Question 4

Calculate the percentage by mass of oxygen in Pb(NO₃)₂.

(Multiple Choice)

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Question 5

What is the empirical formula of a compound that contains 29% Na, 41% S, and 30% O by mass?

(Multiple Choice)

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Question 6

Which one of the following is not true concerning automotive air bags?

(Multiple Choice)

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Question 7

When the following equation is balanced, the coefficient of HCl is __________. CaCO₃ (s)+ HCl (aq)→ CaCl₂ (aq)+ CO₂ (g)+ H₂O (l)

(Multiple Choice)

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Question 8

How many grams of oxygen are in 45 g of C₂H₂O₂?

(Multiple Choice)

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Question 9

How many carbon atoms are there in 52.06 g of carbon dioxide?

(Multiple Choice)

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Question 10

Lead (II)carbonate decomposes to give lead (II)oxide and carbon dioxide: PbCO₃ (s)→ PbO (s)+ CO₂ (g) __________ grams of lead (II)oxide will be produced by the decomposition of 7.50 g of lead (II)carbonate?

(Multiple Choice)

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Question 11

When a hydrocarbon burns in air, a component produced is?

(Multiple Choice)

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Question 12

Automotive air bags inflate when sodium azide decomposes explosively to its constituent elements: 2NaN₃ (s)→ 2Na (s)+ 3N₂ (g) How many grams of sodium azide are required to produce 30.5 g of nitrogen?

(Multiple Choice)

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Question 13

Under appropriate conditions, nitrogen and hydrogen undergo a combination reaction to yield ammonia: N₂ (g)+ 3 H₂ (g)→ 2NH₃ (g) A 9.3-g sample of hydrogen requires __________ g of N₂ for a complete reaction.

(Short Answer)

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Question 14

Determine the mass percent (to the hundredths place)of Na in sodium bicarbonate (NaHCO₃).

(Short Answer)

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Question 15

What mass in grams of hydrogen is produced by the reaction of 4.73 g of magnesium with 1.83 g of water? Mg (s)+ 2 H₂O (l)→ Mg(OH)₂ (s)+ H₂ (g)

(Multiple Choice)

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Question 16

Write the balanced equation for the reaction that occurs when methanol, CH₃OH (l), is burned in air. What is the coefficient of oxygen in the balanced equation?

(Multiple Choice)

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Question 17

When the following equation is balanced, the coefficient of water is __________. N₂O₅ (g)+ H₂O (l)→ HNO₃ (aq)

(Multiple Choice)

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Question 18

When the following equation is balanced, the coefficient of sulfur dioxide is __________. PbS (s)+ O₂ (g)→ PbO (s)+ SO₂ (g)

(Multiple Choice)

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Question 19

Magnesium burns in air with a dazzling brilliance to produce magnesium oxide: 2Mg (s)+ O₂ (g)→ 2MgO (s) When 2.00 g of magnesium burns, the theoretical yield of magnesium oxide is __________ g.

(Multiple Choice)

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Question 20

Showing 1 - 20 of 170

Exam 3: Stoichiometry: Calculations With Chemical Formulas and Equations

A compound that is composed of carbon, hydrogen, and oxygen contains 70.6% C, 5.9% H, and 23.5% O by mass. The molecular weight of the compound is 136 amu. What is the molecular formula?

One million argon atoms is __________ mol (rounded to two significant figures)of argon atoms.

Under appropriate conditions, nitrogen and hydrogen undergo a combination reaction to yield ammonia: N2 (g)+ 3 H2 (g)→ 2NH3 (g) A 7.1-g sample of N2 requires __________ g of H2 for complete reaction.

When the following equation is balanced, the coefficient of H2SO4 is __________. H2SO4 (aq)+ NaOH (aq)→ Na2SO4 (aq)+ H2O (l)

Calculate the percentage by mass of oxygen in Pb(NO3)2.

What is the empirical formula of a compound that contains 29% Na, 41% S, and 30% O by mass?

Which one of the following is not true concerning automotive air bags?

When the following equation is balanced, the coefficient of HCl is __________. CaCO3 (s)+ HCl (aq)→ CaCl2 (aq)+ CO2 (g)+ H2O (l)

How many grams of oxygen are in 45 g of C2H2O2?

How many carbon atoms are there in 52.06 g of carbon dioxide?

Lead (II)carbonate decomposes to give lead (II)oxide and carbon dioxide: PbCO3 (s)→ PbO (s)+ CO2 (g) __________ grams of lead (II)oxide will be produced by the decomposition of 7.50 g of lead (II)carbonate?

When a hydrocarbon burns in air, a component produced is?

Automotive air bags inflate when sodium azide decomposes explosively to its constituent elements: 2NaN3 (s)→ 2Na (s)+ 3N2 (g) How many grams of sodium azide are required to produce 30.5 g of nitrogen?

Under appropriate conditions, nitrogen and hydrogen undergo a combination reaction to yield ammonia: N2 (g)+ 3 H2 (g)→ 2NH3 (g) A 9.3-g sample of hydrogen requires __________ g of N2 for a complete reaction.

Determine the mass percent (to the hundredths place)of Na in sodium bicarbonate (NaHCO3).

What mass in grams of hydrogen is produced by the reaction of 4.73 g of magnesium with 1.83 g of water? Mg (s)+ 2 H2O (l)→ Mg(OH)2 (s)+ H2 (g)

Write the balanced equation for the reaction that occurs when methanol, CH3OH (l), is burned in air. What is the coefficient of oxygen in the balanced equation?

When the following equation is balanced, the coefficient of water is __________. N2O5 (g)+ H2O (l)→ HNO3 (aq)

When the following equation is balanced, the coefficient of sulfur dioxide is __________. PbS (s)+ O2 (g)→ PbO (s)+ SO2 (g)

Magnesium burns in air with a dazzling brilliance to produce magnesium oxide: 2Mg (s)+ O2 (g)→ 2MgO (s) When 2.00 g of magnesium burns, the theoretical yield of magnesium oxide is __________ g.

Introduction: Matter and Measurement

Atoms, Molecules, and Ions

Aqueous Reactions and Solution Stoichiometry

Thermochemistry

Electronic Structure of Atoms

Periodic Properties of the Elements

Basic Concepts of Chemical Bonding

Molecular Geometry and Bonding Theories

Gases

Liquids and Intermolecular Forces

Solids and Modern Materials

Properties of Solutions

Chemical Kinetics

Chemical Equilibrium

Acid-Base Equilibria

Additional Aspects of Aqueous Equilibria

Chemistry of the Environment

Chemical Thermodynamics

Electrochemistry

Nuclear Chemistry

Chemistry of the Nonmetals

Transition Metals and Coordination Chemistry

The Chemistry of Life: Organic and Biological Chemistry

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Under appropriate conditions, nitrogen and hydrogen undergo a combination reaction to yield ammonia: N₂ (g)+ 3 H₂ (g)→ 2NH₃ (g) A 7.1-g sample of N₂ requires __________ g of H₂ for complete reaction.

When the following equation is balanced, the coefficient of H₂SO₄ is __________. H₂SO₄ (aq)+ NaOH (aq)→ Na₂SO₄ (aq)+ H₂O (l)

Calculate the percentage by mass of oxygen in Pb(NO₃)₂.

When the following equation is balanced, the coefficient of HCl is __________. CaCO₃ (s)+ HCl (aq)→ CaCl₂ (aq)+ CO₂ (g)+ H₂O (l)

How many grams of oxygen are in 45 g of C₂H₂O₂?

Lead (II)carbonate decomposes to give lead (II)oxide and carbon dioxide: PbCO₃ (s)→ PbO (s)+ CO₂ (g) __________ grams of lead (II)oxide will be produced by the decomposition of 7.50 g of lead (II)carbonate?

Automotive air bags inflate when sodium azide decomposes explosively to its constituent elements: 2NaN₃ (s)→ 2Na (s)+ 3N₂ (g) How many grams of sodium azide are required to produce 30.5 g of nitrogen?

Under appropriate conditions, nitrogen and hydrogen undergo a combination reaction to yield ammonia: N₂ (g)+ 3 H₂ (g)→ 2NH₃ (g) A 9.3-g sample of hydrogen requires __________ g of N₂ for a complete reaction.

Determine the mass percent (to the hundredths place)of Na in sodium bicarbonate (NaHCO₃).

What mass in grams of hydrogen is produced by the reaction of 4.73 g of magnesium with 1.83 g of water? Mg (s)+ 2 H₂O (l)→ Mg(OH)₂ (s)+ H₂ (g)

Write the balanced equation for the reaction that occurs when methanol, CH₃OH (l), is burned in air. What is the coefficient of oxygen in the balanced equation?

When the following equation is balanced, the coefficient of water is __________. N₂O₅ (g)+ H₂O (l)→ HNO₃ (aq)

When the following equation is balanced, the coefficient of sulfur dioxide is __________. PbS (s)+ O₂ (g)→ PbO (s)+ SO₂ (g)

Magnesium burns in air with a dazzling brilliance to produce magnesium oxide: 2Mg (s)+ O₂ (g)→ 2MgO (s) When 2.00 g of magnesium burns, the theoretical yield of magnesium oxide is __________ g.