Vanadium(V)oxide reacts with calcium according to the chemical equation below.When 10.0 moles of V2O5 are mixed with 10.0 moles of Ca, which is the limiting reagent? V2O5(s)+ 5Ca(l)$\rarr$ 2V(l)+ 5CaO(s)

A) V2O5 B) Ca C) V D) CaO E) No reagent is limiting. A) V2O5 B) Ca C) V D) CaO E) No reagent is limiting.

How many sodium atoms are there in 6.0 g of Na3N?

A) 3.6 * 1024 atoms B) 4.6 * 1022 atoms C) 1.3 * 1023 atoms D) 0.217 atoms E) 0.072 atoms A) 3.6 * 1024 atoms B) 4.6 * 1022 atoms C) 1.3 * 1023 atoms D) 0.217 atoms E) 0.072 atoms

How many moles of HCl are represented by 1.0 * 1019 HCl molecules?

A) 1.7 * 10-5 mol B) 1.5 * 10-3 mol C) 1.0 * 1019 mol D) 36.5 mol E) 6.02 * 104 mol A) 1.7 * 10-5 mol B) 1.5 * 10-3 mol C) 1.0 * 1019 mol D) 36.5 mol E) 6.02 * 104 mol

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

What is the theoretical yield of vanadium that can be produced by the reaction of 40.0 g of V2O5 with 40.0 g of calcium based on the following chemical reaction? V2O5(s)+ 5Ca(l)$\rarr$ 2V(l)+ 5CaO(s)

A) 11.2 g B) 5.6 g C) 22.4 g D) 40.0 g E) 20.3 g A) 11.2 g B) 5.6 g C) 22.4 g D) 40.0 g E) 20.3 g

What is the theoretical yield of vanadium, in moles, that can be produced by the reaction of 2.0 mole of V2O5 with 6.0 mole 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) 2.4 mol E) 4.0 mol A) 1.0 mol B) 1.6 mol C) 2.0 mol D) 2.4 mol E) 4.0 mol

The first step in the Ostwald process for producing nitric acid is 4NH3(g)+ 5O2(g)$\rarr$ 4NO(g)+ 6H2O(g). If the reaction of 150.g of ammonia with 150.g of oxygen gas yields 87.g of nitric oxide (NO), what is the percent yield of this reaction?

A) 100% B) 49% C) 77% D) 33% E) 62% A) 100% B) 49% C) 77% D) 33% E) 62%

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 D) 2.2 * 1021 E) 6.6 * 1022 A) 6.1 * 10-27 B) 3.7 * 10-3 C) 4 D) 2.2 * 1021 E) 6.6 * 1022

Exam 3: Mass Relationships in Chemical Reactions

Balance the equation below using the smallest set of whole numbers. What is the coefficient of H₂O? _ PCl₃(l)+ _ H₂O(l) $\rarr$ _ H₃PO₃(aq)+ _ HCl(aq)

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(Multiple Choice)

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Question 1

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Commonly used gases in the laboratory are generally obtained from pressurized metal gas cylinders, but for small amounts of occasionally used gases, it is sometimes easier just to prepare them chemically as needed.For example, nitrogen monoxide, NO(g), can be prepared in the lab by the following chemical reaction: 3Cu(s)+ 8HNO₃(aq) $\rarr$ 2NO(g)+ 3Cu(NO₃)₂(aq)+ 4H₂O(l) If 15 g of copper metal was added to an aqueous solution containing 6.0 moles of HNO₃, how many moles of NO(g)would be produced, assuming a 75% yield.

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Question 2

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0.12 mole NO

The Hall process for the production of aluminum involves the reaction of aluminum oxide with elemental carbon to give aluminum metal and carbon monoxide. If the yield of this reaction is 82% and aluminum ore is 71% by mass aluminum oxide, what mass of aluminum ore must be mined in order to produce 1.0 * 10³ kg (1 metric ton)of aluminum metal by the Hall process?

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Question 3

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Vanadium(V)oxide reacts with calcium according to the chemical equation below.When 10.0 moles of V₂O₅ are mixed with 10.0 moles of Ca, which is the limiting reagent? V₂O₅(s)+ 5Ca(l) $\rarr$ 2V(l)+ 5CaO(s)

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Question 4

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 5

Commonly used gases in the laboratory are generally obtained from pressurized metal gas cylinders, but for small amounts of occasionally used gases, it is sometimes easier just to prepare them chemically as needed.For example, nitrogen monoxide, NO(g), can be prepared in the lab by the following chemical reaction: 3Cu(s)+ 8HNO₃(aq) $\rarr$ 2NO(g)+ 3Cu(NO₃)₂(aq)+ 4H₂O(l) If 5.0 g of copper metal was added to an aqueous solution containing 2.5 moles of HNO₃, how many moles of NO(g)would be produced, assuming a 100% yield.

(Short Answer)

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Question 6

Balance the following chemical equation: Al(s)+ Co(NO₃)₂(aq) $\rarr$ Al(NO₃)₃(aq)+ Co(s)

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Question 7

How many sodium atoms are there in 6.0 g of Na₃N?

(Multiple Choice)

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Question 8

How many Mg atoms are present in 170 g of Mg?

(Short Answer)

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Question 9

How many moles of HCl are represented by 1.0 * 10¹⁹ HCl molecules?

(Multiple Choice)

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Question 10

Calculate the percent composition by mass of oxygen in Na₂CO₃.

(Short Answer)

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Question 11

What is the mass of 0.0250 mol of P₂O₅?

(Multiple Choice)

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Question 12

What is the theoretical yield of vanadium that can be produced by the reaction of 40.0 g of V₂O₅ with 40.0 g of calcium based on the following chemical reaction? V₂O₅(s)+ 5Ca(l) $\rarr$ 2V(l)+ 5CaO(s)

(Multiple Choice)

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Question 13

Calculate the mass of FeS formed when 9.42 g of iron reacts with 8.50 g of sulfur according to the following reaction. Fe(s)+ S(s) $\rarr$ FeS(s)

(Multiple Choice)

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Question 14

What is the theoretical yield of vanadium, in moles, that can be produced by the reaction of 2.0 mole of V₂O₅ with 6.0 mole of calcium based on the following chemical reaction? V₂O₅(s)+ 5Ca(l) $\rarr$ 2V(l)+ 5CaO(s)

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Question 15

The first step in the Ostwald process for producing nitric acid is 4NH₃(g)+ 5O₂(g) $\rarr$ 4NO(g)+ 6H₂O(g). If the reaction of 150.g of ammonia with 150.g of oxygen gas yields 87.g of nitric oxide (NO), what is the percent yield of this reaction?

(Multiple Choice)

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Question 16

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)

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Question 17

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

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Question 18

How many moles of oxygen atoms are there in 10 moles of KClO₃?

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Question 19

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?

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Question 20

Showing 1 - 20 of 168

Exam 3: Mass Relationships in Chemical Reactions

Balance the equation below using the smallest set of whole numbers. What is the coefficient of H2O? ___ PCl3(l)+ ___ H2O(l) →\rarr→ ___ H3PO3(aq) + ___ HCl(aq)

Vanadium(V)oxide reacts with calcium according to the chemical equation below.When 10.0 moles of V2O5 are mixed with 10.0 moles of Ca, which is the limiting reagent? V2O5(s)+ 5Ca(l) →\rarr→ 2V(l)+ 5CaO(s)

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

Balance the following chemical equation: Al(s)+ Co(NO3)2(aq) →\rarr→ Al(NO3)3(aq)+ Co(s)

How many sodium atoms are there in 6.0 g of Na3N?

How many Mg atoms are present in 170 g of Mg?

How many moles of HCl are represented by 1.0 * 1019 HCl molecules?

Calculate the percent composition by mass of oxygen in Na2CO3.

What is the mass of 0.0250 mol of P2O5?

What is the theoretical yield of vanadium that can be produced by the reaction of 40.0 g of V2O5 with 40.0 g of calcium based on the following chemical reaction? V2O5(s)+ 5Ca(l) →\rarr→ 2V(l)+ 5CaO(s)

Calculate the mass of FeS formed when 9.42 g of iron reacts with 8.50 g of sulfur according to the following reaction. Fe(s)+ S(s) →\rarr→ FeS(s)

What is the theoretical yield of vanadium, in moles, that can be produced by the reaction of 2.0 mole of V2O5 with 6.0 mole of calcium based on the following chemical reaction? V2O5(s)+ 5Ca(l) →\rarr→ 2V(l)+ 5CaO(s)

The first step in the Ostwald process for producing nitric acid is 4NH3(g)+ 5O2(g) →\rarr→ 4NO(g)+ 6H2O(g). If the reaction of 150.g of ammonia with 150.g of oxygen gas yields 87.g of nitric oxide (NO), what is the percent yield of this 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?

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

How many moles of oxygen atoms are there in 10 moles of KClO3?

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?

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Balance the equation below using the smallest set of whole numbers. What is the coefficient of H₂O? _ PCl₃(l)+ _ H₂O(l) $\rarr$ _ H₃PO₃(aq)+ _ HCl(aq)

Vanadium(V)oxide reacts with calcium according to the chemical equation below.When 10.0 moles of V₂O₅ are mixed with 10.0 moles of Ca, which is the limiting reagent? V₂O₅(s)+ 5Ca(l) $\rarr$ 2V(l)+ 5CaO(s)

Balance the following chemical equation: Al(s)+ Co(NO₃)₂(aq) $\rarr$ Al(NO₃)₃(aq)+ Co(s)

How many sodium atoms are there in 6.0 g of Na₃N?

How many moles of HCl are represented by 1.0 * 10¹⁹ HCl molecules?

Calculate the percent composition by mass of oxygen in Na₂CO₃.

What is the mass of 0.0250 mol of P₂O₅?

What is the theoretical yield of vanadium that can be produced by the reaction of 40.0 g of V₂O₅ with 40.0 g of calcium based on the following chemical reaction? V₂O₅(s)+ 5Ca(l) $\rarr$ 2V(l)+ 5CaO(s)

Calculate the mass of FeS formed when 9.42 g of iron reacts with 8.50 g of sulfur according to the following reaction. Fe(s)+ S(s) $\rarr$ FeS(s)

What is the theoretical yield of vanadium, in moles, that can be produced by the reaction of 2.0 mole of V₂O₅ with 6.0 mole of calcium based on the following chemical reaction? V₂O₅(s)+ 5Ca(l) $\rarr$ 2V(l)+ 5CaO(s)

The first step in the Ostwald process for producing nitric acid is 4NH₃(g)+ 5O₂(g) $\rarr$ 4NO(g)+ 6H₂O(g). If the reaction of 150.g of ammonia with 150.g of oxygen gas yields 87.g of nitric oxide (NO), what is the percent yield of this reaction?

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

How many moles of oxygen atoms are there in 10 moles of KClO₃?

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?