How many atoms are in 0.0728 g of PCl3?

A) 1.28 * 1021 atoms B) 4.38 * 1022 atoms C) 4.39 * 1021 atoms D) 3.19 * 1020 atoms E) 6.02 * 1024 atoms A) 1.28 * 1021 atoms B) 4.38 * 1022 atoms C) 4.39 * 1021 atoms D) 3.19 * 1020 atoms E) 6.02 * 1024 atoms

Ammonia reacts with diatomic oxygen to form nitric oxide and water vapor: 4NH3 + 5O2 $\rarr$ 4NO + 6H2O What is the theoretical yield of water, in moles, when 40.0 g NH3 and 50.0 g O2 are mixed and allowed to react?

A) 1.30 mol B) 1.57 mol C) 1.87 mol D) 3.53 mol E) None of these. A) 1.30 mol B) 1.57 mol C) 1.87 mol D) 3.53 mol E) None of these.

The mass of 1.63 * 1021 silicon atoms is

A) 2.71 * 10-23 g. B) 4.58 * 1022 g. C) 28.08 g. D) 1.04 * 104 g. E) 7.60 * 10-2 g. A) 2.71 * 10-23 g. B) 4.58 * 1022 g. C) 28.08 g. D) 1.04 * 104 g. E) 7.60 * 10-2 g.

How many grams of Cr can be produced by the reaction of 44.1 g of Cr2O3 with 35.0 g of Al according to the following chemical reaction? 2Al + Cr2O3 $\rarr$ Al2O3 + 2Cr

A) 7.56 g B) 30.2 g C) 67.4 g D) 104 g E) None of these. A) 7.56 g B) 30.2 g C) 67.4 g D) 104 g E) None of these.

Ammonia reacts with diatomic oxygen to form nitric oxide and water vapor: 4NH3 + 5O2 $\rarr$ 4NO + 6H2O When 40.0 g NH3 and 50.0 g O2 are allowed to react, which is the limiting reagent?

A) NH3 B) O2 C) NO D) H2O E) No reagent is limiting. A) NH3 B) O2 C) NO D) H2O E) No reagent is limiting.

How many moles of O atoms are in 25.7 g of CaSO4?

A) 0.189 mol B) 0.755 mol C) 4.00 mol D) 1.14 * 1023 mol E) 4.55 * 1023 mol A) 0.189 mol B) 0.755 mol C) 4.00 mol D) 1.14 * 1023 mol E) 4.55 * 1023 mol

Calculate the mass of 3.00 moles of CF2Cl2.

A) 3.00 g B) 174 g C) 363 g D) 1.81 * 1024 g E) 40.3 g A) 3.00 g B) 174 g C) 363 g D) 1.81 * 1024 g E) 40.3 g

What is the mass of 7.80 * 1018 carbon atoms?

A) 1.30 * 10 -5 g B) 6.43 * 103 g C) 7.80 * 1018 g D) 1.56 * 10 -4 g E) 12.01 g A) 1.30 * 10 -5 g B) 6.43 * 103 g C) 7.80 * 1018 g D) 1.56 * 10 -4 g E) 12.01 g

Exam 3: Stoichiometry

Ammonium nitrate decomposes to give dinitrogen monoxide and water as shown in the following reaction: NH₄NO₃ $\rarr$ N₂O + 2H₂O If a 108 g sample of NH₄NO₃ decomposes to give 23 g of N₂O(g), what percent of the original sample remains?

(Short Answer)

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Question 141

Liquid heptane, C₇H₁₆, burns in oxygen gas to yield carbon dioxide and water. What is the minimum mass of oxygen required for the complete reaction of 25.5 mL of heptane? (density of heptane = 0.6838 g/mL)

(Multiple Choice)

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Question 142

A compound with a percent composition by mass of 87.5% N and 12.5% H was recently discovered. What is the empirical formula for this compound?

(Short Answer)

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Question 143

An average atom of uranium (U)is approximately how many times heavier than an atom of potassium?

(Multiple Choice)

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Question 144

Balance the following chemical equation: H₂ + N₂ $\rarr$ NH₃

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Question 145

Liquid heptane, C₇H₁₆, burns in oxygen gas to yield carbon dioxide and water. What mass of water is produced when 15.0 mL of heptane burns completely? (density of heptane = 0.6838 g/mL)

(Multiple Choice)

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Question 146

A 0.8715 g sample of sorbic acid, a compound first obtained from the berries of a certain ash tree, is burned completely in oxygen to give 2.053 g of carbon dioxide and 0.5601 g of water. The empirical formula of sorbic acid is

(Multiple Choice)

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Question 147

Oxidation of a hydrocarbon gave a product composed of carbon, hydrogen, and oxygen. The product that was purified and sent off for elemental analysis giving the following mass percents: 68.85% C and 4.95% H. Determine the empirical formula of this compound.

(Short Answer)

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Question 148

How many atoms are in 0.0728 g of PCl₃?

(Multiple Choice)

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Question 149

Calculate the percent composition by mass of oxygen in Na₂CO₃.

(Short Answer)

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Question 150

Ammonia reacts with diatomic oxygen to form nitric oxide and water vapor: 4NH₃ + 5O₂ $\rarr$ 4NO + 6H₂O What is the theoretical yield of water, in moles, when 40.0 g NH₃ and 50.0 g O₂ are mixed and allowed to react?

(Multiple Choice)

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Question 151

The mass of 1.63 * 10²¹ silicon atoms is

(Multiple Choice)

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Question 152

What is the coefficient of H₂SO₄ when the following equation is properly balanced with the smallest set of whole numbers? _ Ca₃(PO₄)₂ + _ H₂SO₄ $\rarr$ _ CaSO₄ + _ H₃PO₄

(Multiple Choice)

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Question 153

Nickel has a lower atomic mass than cobalt, even though it has a higher atomic number. One possible explanation is that one of the average atomic masses was miscalculated. In the case of cobalt, there is only one isotope: 100% ⁵⁹Co at a mass of 58.9332 amu. For nickel, however, there are five isotopes as given in the table. A. Using the data in the table, calculate the average atomic mass for nickel. B. Is the atomic mass for nickel in your periodic table correct? C. Regardless of your answer to part B, how else could you explain the observation that the atomic mass of nickel is less than the mass of cobalt, even though it has the higher atomic number?

(Essay)

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Question 154

How many grams of Cr can be produced by the reaction of 44.1 g of Cr₂O₃ with 35.0 g of Al according to the following chemical reaction? 2Al + Cr₂O₃ $\rarr$ Al₂O₃ + 2Cr

(Multiple Choice)

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Question 155

Ammonia reacts with diatomic oxygen to form nitric oxide and water vapor: 4NH₃ + 5O₂ $\rarr$ 4NO + 6H₂O When 40.0 g NH₃ and 50.0 g O₂ are allowed to react, which is the limiting reagent?

(Multiple Choice)

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Question 156

How many moles of O atoms are in 25.7 g of CaSO₄?

(Multiple Choice)

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Question 157

Calculate the mass of 3.00 moles of CF₂Cl₂.

(Multiple Choice)

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Question 158

What is the mass of 7.80 * 10¹⁸ carbon atoms?

(Multiple Choice)

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Question 159

Calculate the number of moles of cesium in 50.0 g of cesium.

(Multiple Choice)

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Question 160

Showing 141 - 160 of 168

Exam 3: Stoichiometry

Ammonium nitrate decomposes to give dinitrogen monoxide and water as shown in the following reaction: NH4NO3 →\rarr→ N2O + 2H2O If a 108 g sample of NH4NO3 decomposes to give 23 g of N2O(g), what percent of the original sample remains?

Liquid heptane, C7H16, burns in oxygen gas to yield carbon dioxide and water. What is the minimum mass of oxygen required for the complete reaction of 25.5 mL of heptane? (density of heptane = 0.6838 g/mL)

A compound with a percent composition by mass of 87.5% N and 12.5% H was recently discovered. What is the empirical formula for this compound?

An average atom of uranium (U)is approximately how many times heavier than an atom of potassium?

Balance the following chemical equation: H2 + N2 →\rarr→ NH3

Liquid heptane, C7H16, burns in oxygen gas to yield carbon dioxide and water. What mass of water is produced when 15.0 mL of heptane burns completely? (density of heptane = 0.6838 g/mL)

A 0.8715 g sample of sorbic acid, a compound first obtained from the berries of a certain ash tree, is burned completely in oxygen to give 2.053 g of carbon dioxide and 0.5601 g of water. The empirical formula of sorbic acid is

Oxidation of a hydrocarbon gave a product composed of carbon, hydrogen, and oxygen. The product that was purified and sent off for elemental analysis giving the following mass percents: 68.85% C and 4.95% H. Determine the empirical formula of this compound.

How many atoms are in 0.0728 g of PCl3?

Calculate the percent composition by mass of oxygen in Na2CO3.

Ammonia reacts with diatomic oxygen to form nitric oxide and water vapor: 4NH3 + 5O2 →\rarr→ 4NO + 6H2O What is the theoretical yield of water, in moles, when 40.0 g NH3 and 50.0 g O2 are mixed and allowed to react?

The mass of 1.63 * 1021 silicon atoms is

What is the coefficient of H2SO4 when the following equation is properly balanced with the smallest set of whole numbers? ___ Ca3(PO4)2 + ___ H2SO4 →\rarr→ ___ CaSO4 + ___ H3PO4

How many grams of Cr can be produced by the reaction of 44.1 g of Cr2O3 with 35.0 g of Al according to the following chemical reaction? 2Al + Cr2O3 →\rarr→ Al2O3 + 2Cr

Ammonia reacts with diatomic oxygen to form nitric oxide and water vapor: 4NH3 + 5O2 →\rarr→ 4NO + 6H2O When 40.0 g NH3 and 50.0 g O2 are allowed to react, which is the limiting reagent?

How many moles of O atoms are in 25.7 g of CaSO4?

Calculate the mass of 3.00 moles of CF2Cl2.

What is the mass of 7.80 * 1018 carbon atoms?

Calculate the number of moles of cesium in 50.0 g of cesium.

Introduction

Atoms, Molecules, and Ions

Reactions in Aqueous Solution

Gases

Energy Relationships in Chemical Reactions

The Electronic Structure of Atoms

The Periodic Table

Chemical Bonding I: the Covalent Bond

Chemical Bonding Ii: Molecular Geometry and Hybridization of Atomic Orbitals

Introduction to Organic Chemistry

Intermolecular Forces and Liquids and Solids

Physical Properties of Solutions

Chemical Kinetics

Chemical Equilibrium

Acids and Bases

Acid-Base Equilibria and Solubility Equilibria

Thermodynamics

Redox Reactions and Electrochemistry

The Chemistry of Coordination Compounds

Nuclear Chemistry

Organic Polymerssynthetic and Natural

Filters

Ammonium nitrate decomposes to give dinitrogen monoxide and water as shown in the following reaction: NH₄NO₃ $\rarr$ N₂O + 2H₂O If a 108 g sample of NH₄NO₃ decomposes to give 23 g of N₂O(g), what percent of the original sample remains?

Liquid heptane, C₇H₁₆, burns in oxygen gas to yield carbon dioxide and water. What is the minimum mass of oxygen required for the complete reaction of 25.5 mL of heptane? (density of heptane = 0.6838 g/mL)

Balance the following chemical equation: H₂ + N₂ $\rarr$ NH₃

Liquid heptane, C₇H₁₆, burns in oxygen gas to yield carbon dioxide and water. What mass of water is produced when 15.0 mL of heptane burns completely? (density of heptane = 0.6838 g/mL)

How many atoms are in 0.0728 g of PCl₃?

Calculate the percent composition by mass of oxygen in Na₂CO₃.

Ammonia reacts with diatomic oxygen to form nitric oxide and water vapor: 4NH₃ + 5O₂ $\rarr$ 4NO + 6H₂O What is the theoretical yield of water, in moles, when 40.0 g NH₃ and 50.0 g O₂ are mixed and allowed to react?

The mass of 1.63 * 10²¹ silicon atoms is

What is the coefficient of H₂SO₄ when the following equation is properly balanced with the smallest set of whole numbers? _ Ca₃(PO₄)₂ + _ H₂SO₄ $\rarr$ _ CaSO₄ + _ H₃PO₄

How many grams of Cr can be produced by the reaction of 44.1 g of Cr₂O₃ with 35.0 g of Al according to the following chemical reaction? 2Al + Cr₂O₃ $\rarr$ Al₂O₃ + 2Cr

Ammonia reacts with diatomic oxygen to form nitric oxide and water vapor: 4NH₃ + 5O₂ $\rarr$ 4NO + 6H₂O When 40.0 g NH₃ and 50.0 g O₂ are allowed to react, which is the limiting reagent?

How many moles of O atoms are in 25.7 g of CaSO₄?

Calculate the mass of 3.00 moles of CF₂Cl₂.

What is the mass of 7.80 * 10¹⁸ carbon atoms?