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

How many O atoms are in 4.39 g of CO2?

A) 5.29 x 1024 O atoms B) 1.03 x 1022 O atoms C) 1.65 x 1023 O atoms D) 6.01 x 1022 O atoms E) 1.20 x 1023 O atoms A) 5.29 x 1024 O atoms B) 1.03 x 1022 O atoms C) 1.65 x 1023 O atoms D) 6.01 x 1022 O atoms E) 1.20 x 1023 O atoms

Formaldehyde has the formula CH2O.How many molecules are there in 0.11 g of formaldehyde?

A) 6.1 × 10-27 B) 3.7 × 10-3 C) 4.0 D) 2.2 × 1021 E) 6.6 × 1022 A) 6.1 × 10-27 B) 3.7 × 10-3 C) 4.0 D) 2.2 × 1021 E) 6.6 × 1022

What is the theoretical yield of vanadium, in moles, that can be produced by the reaction of 1.0 mole of V2O5 with 4.0 moles of calcium based on the following chemical reaction? V2O5(s)+ 5Ca(l)$\rarr$ 2V(l)+ 5CaO(s)

A) 1.0 mol B) 1.6 mol C) 2.0 mol D) 0.80 mol E) None of these A) 1.0 mol B) 1.6 mol C) 2.0 mol D) 0.80 mol E) None of these

What is the mass of 0.0250 mol of P2O5?

A) 35.5 g B) 5676 g C) 0.0250 g D) 1.51 × 1022 g E) 3.55 g A) 35.5 g B) 5676 g C) 0.0250 g D) 1.51 × 1022 g E) 3.55 g

Hydrogen chloride gas can be prepared by the following reaction: 2NaCl(s)+ H2SO4(aq)$\rarr$ 2HCl(g)+ Na2SO4(s) How many grams of HCl can be prepared from 2.00 mol H2SO4 and 2.56 mol NaCl?

A) 7.30 g B) 93.3 g C) 146 g D) 150 g E) 196 g A) 7.30 g B) 93.3 g C) 146 g D) 150 g E) 196 g

When balanced the coefficient of O2 in the following equation is __ C2H4 + __ O2 $\rarr$ __ CO2 + __ H2O

A) 1. B) 2. C) 3. D) 4. E) 6. A) 1. B) 2. C) 3. D) 4. E) 6.

Exam 3: Mass Relationships in Chemical Reactions

A sample of iron metal is placed in a graduated cylinder.It is noted that 10.4 mL of water is displaced by the iron.The iron is then reacted with excess hydrochloric acid to produce iron (II)chloride and hydrogen gas.Given the density for iron is 7.86 g/mL, how many grams of iron (II)chloride are produced in the reaction? Fe(s)+ 2HCl(aq) $\rarr$ FeCl₂(aq)+ H₂(g)

(Multiple Choice)

4.7/5

(32)

Question 141

A compound was discovered whose composition by mass is 85.6% C and 14.4% H.Which of the following could be the molecular formula of this compound?

(Multiple Choice)

4.8/5

(43)

Question 142

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

(Multiple Choice)

4.9/5

(36)

Question 143

Refer to the (unbalanced)equation CS₂ + CaO $\rarr$ CO₂ + CaS.How many grams of CaO are required to react completely with 38 g of CS₂?

(Short Answer)

4.9/5

(39)

Question 144

A silver wire has a diameter of 0.500 mm.What length of this wire contains exactly 1.00 mol of silver? (density of Ag = 10.5 g/cm³)

(Multiple Choice)

4.8/5

(31)

Question 145

Calculate the mass of 3.00 moles of CF₂Cl₂.

(Multiple Choice)

4.7/5

(36)

Question 146

Lithium metal reacts with nitrogen gas to form lithium nitride.Identify the balanced reaction that describes this process.

(Multiple Choice)

4.8/5

(41)

Question 147

How many O atoms are in 4.39 g of CO₂?

(Multiple Choice)

4.8/5

(34)

Question 148

A chemistry student determined the empirical formula for tungsten oxide (W_xO_y).To do so, he heated tungsten with oxygen in a crucible.The data that he recorded are shown below: What is the empirical formula of tungsten oxide?

(Short Answer)

4.7/5

(35)

Question 149

Formaldehyde has the formula CH₂O.How many molecules are there in 0.11 g of formaldehyde?

(Multiple Choice)

4.8/5

(35)

Question 150

What is the coefficient for O₂ when the following combustion reaction of a hydrocarbon is balanced? _ C₇H₁₄ + _ O₂ $\rarr$ _ CO₂ + _ H₂O

(Multiple Choice)

4.9/5

(44)

Question 151

What is the theoretical yield of vanadium, in moles, that can be produced by the reaction of 1.0 mole of V₂O₅ with 4.0 moles of calcium based on the following chemical reaction? V₂O₅(s)+ 5Ca(l) $\rarr$ 2V(l)+ 5CaO(s)

(Multiple Choice)

4.8/5

(37)

Question 152

What is the mass of 0.0250 mol of P₂O₅?

(Multiple Choice)

4.8/5

(38)

Question 153

Hydrogen chloride gas can be prepared by the following reaction: 2NaCl(s)+ H₂SO₄(aq) $\rarr$ 2HCl(g)+ Na₂SO₄(s) How many grams of HCl can be prepared from 2.00 mol H₂SO₄ and 2.56 mol NaCl?

(Multiple Choice)

4.8/5

(32)

Question 154

What is the average mass of one Ca atom?

(Multiple Choice)

4.9/5

(37)

Question 155

Phosphorus reacts with iodine as shown in the chemical reaction below.What is the percent yield of the reaction if 28.2 g PI₃ is obtained from the reaction of 48.0 g of I₂ with excess phosphorus? 2P(s)+ 3I₂(s) $\rarr$ 2PI₃(s)

(Short Answer)

4.8/5

(44)

Question 156

Phosphorus pentachloride reacts with water to form hydrochloric acid and phosphoric acid.How many total moles of acid are formed when starting with 4.5 g of PCl₅ and excess H₂O? PCl₅ + 4H₂O $\rarr$ 5HCl + H₃PO₄

(Multiple Choice)

4.8/5

(46)

Question 157

When balanced the coefficient of O₂ in the following equation is C₂H₄ + O₂ $\rarr$ CO₂ + H₂O

(Multiple Choice)

4.8/5

(38)

Question 158

Which one of the following is an example of a balanced chemical reaction?

(Multiple Choice)

4.9/5

(30)

Question 159

Boron obtained from borax deposits in Death Valley consists of two isotopes.They are boron-10 and boron-11 with atomic masses of 10.013 amu and 11.009 amu, respectively.The atomic mass of boron is 10.81 amu (see periodic table).Which isotope of boron is more abundant, boron-10 or boron-11?

(Multiple Choice)

5.0/5

(46)

Question 160

Showing 141 - 160 of 194

Exam 3: Mass Relationships in Chemical Reactions

A compound was discovered whose composition by mass is 85.6% C and 14.4% H.Which of the following could be the molecular formula of this compound?

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

Refer to the (unbalanced)equation CS2 + CaO →\rarr→ CO2 + CaS.How many grams of CaO are required to react completely with 38 g of CS2?

A silver wire has a diameter of 0.500 mm.What length of this wire contains exactly 1.00 mol of silver? (density of Ag = 10.5 g/cm3)

Calculate the mass of 3.00 moles of CF2Cl2.

Lithium metal reacts with nitrogen gas to form lithium nitride.Identify the balanced reaction that describes this process.

How many O atoms are in 4.39 g of CO2?

A chemistry student determined the empirical formula for tungsten oxide (WxOy).To do so, he heated tungsten with oxygen in a crucible.The data that he recorded are shown below: What is the empirical formula of tungsten oxide?

Formaldehyde has the formula CH2O.How many molecules are there in 0.11 g of formaldehyde?

What is the coefficient for O2 when the following combustion reaction of a hydrocarbon is balanced? ___ C7H14 + ___ O2 →\rarr→ ___ CO2 + ___ H2O

What is the theoretical yield of vanadium, in moles, that can be produced by the reaction of 1.0 mole of V2O5 with 4.0 moles of calcium based on the following chemical reaction? V2O5(s)+ 5Ca(l) →\rarr→ 2V(l)+ 5CaO(s)

What is the mass of 0.0250 mol of P2O5?

Hydrogen chloride gas can be prepared by the following reaction: 2NaCl(s)+ H2SO4(aq) →\rarr→ 2HCl(g)+ Na2SO4(s) How many grams of HCl can be prepared from 2.00 mol H2SO4 and 2.56 mol NaCl?

What is the average mass of one Ca atom?

Phosphorus reacts with iodine as shown in the chemical reaction below.What is the percent yield of the reaction if 28.2 g PI3 is obtained from the reaction of 48.0 g of I2 with excess phosphorus? 2P(s)+ 3I2(s) →\rarr→ 2PI3(s)

Phosphorus pentachloride reacts with water to form hydrochloric acid and phosphoric acid.How many total moles of acid are formed when starting with 4.5 g of PCl5 and excess H2O? PCl5 + 4H2O →\rarr→ 5HCl + H3PO4

When balanced the coefficient of O2 in the following equation is __ C2H4 + __ O2 →\rarr→ __ CO2 + __ H2O

Which one of the following is an example of a balanced chemical reaction?

Boron obtained from borax deposits in Death Valley consists of two isotopes.They are boron-10 and boron-11 with atomic masses of 10.013 amu and 11.009 amu, respectively.The atomic mass of boron is 10.81 amu (see periodic table).Which isotope of boron is more abundant, boron-10 or boron-11?

Chemistry: the Study of Change

Atoms, Molecules, and Ions

Reactions in Aqueous Solutions

Gases

Thermochemistry

Quantum Theory and the Electronic Structure of Atoms

Periodic Relationships Among the Elements

Chemical Bonding I: Basic Concepts

Chemical Bonding Ii: Molecular Geometry and Hybridization of Atomic Orbitals

Intermolecular Forces and Liquids and Solids

Physical Properties of Solutions

Chemical Kinetics

Chemical Equilibrium

Acids and Bases

Acid-Base Equilibria and Solubility Equilibria

Entropy Free Energy and Equilibrium

Electrochemistry

Nuclear Chemistry

Chemistry in the Atmosphere

Metallurgy and the Chemistry of Metals

Nonmetallic Elements and Their Compounds

Transition Metal Chemistry and Coordination Compounds

Organic Chemistry

Synthetic and Natural Organic Polymers

Filters

Refer to the (unbalanced)equation CS₂ + CaO $\rarr$ CO₂ + CaS.How many grams of CaO are required to react completely with 38 g of CS₂?

A silver wire has a diameter of 0.500 mm.What length of this wire contains exactly 1.00 mol of silver? (density of Ag = 10.5 g/cm³)

Calculate the mass of 3.00 moles of CF₂Cl₂.

How many O atoms are in 4.39 g of CO₂?

A chemistry student determined the empirical formula for tungsten oxide (W_xO_y).To do so, he heated tungsten with oxygen in a crucible.The data that he recorded are shown below: What is the empirical formula of tungsten oxide?

Formaldehyde has the formula CH₂O.How many molecules are there in 0.11 g of formaldehyde?

What is the coefficient for O₂ when the following combustion reaction of a hydrocarbon is balanced? _ C₇H₁₄ + _ O₂ $\rarr$ _ CO₂ + _ H₂O

What is the theoretical yield of vanadium, in moles, that can be produced by the reaction of 1.0 mole of V₂O₅ with 4.0 moles of calcium based on the following chemical reaction? V₂O₅(s)+ 5Ca(l) $\rarr$ 2V(l)+ 5CaO(s)

What is the mass of 0.0250 mol of P₂O₅?

Hydrogen chloride gas can be prepared by the following reaction: 2NaCl(s)+ H₂SO₄(aq) $\rarr$ 2HCl(g)+ Na₂SO₄(s) How many grams of HCl can be prepared from 2.00 mol H₂SO₄ and 2.56 mol NaCl?

Phosphorus reacts with iodine as shown in the chemical reaction below.What is the percent yield of the reaction if 28.2 g PI₃ is obtained from the reaction of 48.0 g of I₂ with excess phosphorus? 2P(s)+ 3I₂(s) $\rarr$ 2PI₃(s)

Phosphorus pentachloride reacts with water to form hydrochloric acid and phosphoric acid.How many total moles of acid are formed when starting with 4.5 g of PCl₅ and excess H₂O? PCl₅ + 4H₂O $\rarr$ 5HCl + H₃PO₄

When balanced the coefficient of O₂ in the following equation is C₂H₄ + O₂ $\rarr$ CO₂ + H₂O