Question 1

The combustion of ammonia in the presence of excess oxygen yields NO₂ and H₂O: 4 NH₃ (g)+ 7 O₂ (g)→ 4 NO₂ (g)+ 6 H₂O (g) The combustion of 14.4 g of ammonia consumes ________ g of oxygen.

Accepted Answer

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Question 2

How many moles of lithium phosphate (Li₃PO₄)are contained in 66.6 g of lithium phosphate?

Accepted Answer

The molar mass of lithium phosphate (Li3PO4) is approximately 115.79 g/mol. To find the number of moles in 66.6 g of lithium phosphate, use the formula: moles = mass (g) / molar mass (g/mol). Thus, 66.6 g / 115.79 g/mol ≈ 0.575 moles.

Question 3

A 1.36-g sample of magnesium nitrate,Mg(NO₃)₂,contains ________ mol of this compound.

Accepted Answer

The molar mass of Mg(NO3)2 is approximately 148.31 g/mol. To find the number of moles, divide the mass of the sample by the molar mass: 1.36 g / 148.31 g/mol ≈ 0.00917 mol.

Question 4

Magnesium burns in air with a dazzling brilliance to produce magnesium oxide: 2Mg (s)+ O₂(g)→ 2MgO (s) How many moles of O₂are consumed when 3.55 mol of magnesium burns?

Accepted Answer

According to the balanced equation, 2 moles of Mg react with 1 mole of O2. Therefore, 3.55 moles of Mg will consume 3.55/2 = 1.775 moles of O2, which is approximately 1.78 moles.

Question 5

How many grams of calcium cyanide (Ca(CN)₂)are contained in 0.69 mol of calcium cyanide?

Accepted Answer

1 mol of Ca(CN)2 contains 2 mol of cyanide ions (CN-) and 1 mol of calcium ions (Ca2+).
Therefore, 0.69 mol of Ca(CN)2 contains 2 x 0.69 = 1.38 mol of cyanide ions and 0.69 mol of calcium ions.
The molar mass of Ca(CN)2 is (40.08 + 2x12.01 + 2x14.01) g/mol = 92.11 g/mol.
The mass of 0.69 mol of Ca(CN)2 is (0.69 mol) x (92.11 g/mol) = 63.45 g.
Therefore, there are 63.45 g / 1 mol = 64 g/mol of Ca(CN)2 in 0.69 mol of Ca(CN)2.

Question 6

Magnesium and nitrogen react in a combination reaction to produce magnesium nitride: 3 Mg + N₂ → Mg₃N₂ In a particular experiment,a 8.33-g sample of reacts completely.The mass of Mg consumed is ________ g.

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Question 7

A certain alcohol contains only three elements,carbon,hydrogen,and oxygen.Combustion of a 60.00 gram sample of the alcohol produced 114.6 grams of CO₂ and 70.44 grams of H₂O.What is the empirical formula of the alcohol?

Accepted Answer

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Question 8

How many grams of phenol (C₆H₅OH)are contained in 5.50 mol of phenol?

Accepted Answer

To find the grams of phenol in 5.50 mol, multiply the molar mass of phenol by the number of moles. The molar mass of phenol (C6H5OH) is approximately 94.11 g/mol. Therefore, 5.50 mol × 94.11 g/mol = 517.605 g, which rounds to 518 g.

Question 9

Lithium and nitrogen react to produce lithium nitride: 6Li (s)+ N₂ (g)→ 2Li₃N (s) How many moles of N₂are needed to react with 0.550 mol of lithium?

Accepted Answer

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Question 10

Lithium and nitrogen react to produce lithium nitride: 6Li (s)+ N₂(g)→ 2Li₃N (s) How many moles of lithium nitride are produced when 0.330 mol of lithium react in this fashion?

Accepted Answer

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Question 11

Automotive air bags inflate when sodium azide decomposes explosively to its constituent elements: 2NaN₃ (s)→ 2Na (s)+ 3N₂ (g) How many moles of N₂are produced by the decomposition of 1.75 mol of sodium azide?

Accepted Answer

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Question 12

What is the empirical formula of a compound that is 66.6% C,11.2% H,and 22.2% O by mass?

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Question 13

How many moles of pyridine (C₅H₅N)are contained in 4.14 g of pyridine?

Accepted Answer

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Question 14

What is the mass in grams of 2.00 × 10⁵atoms of naturally occurring neon?

Accepted Answer

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Question 15

What is the mass in grams of 9.76 × 10¹² atoms of naturally occurring potassium?

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Question 16

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 28.0 g of nitrogen?

Accepted Answer

The answer of Automotive air bags inflate when sodium azide...

Question 17

The combustion of propane (C₃H₈)produces CO₂ and H₂O: C₃H₈ (g)+ 5O₂(g)→ 3CO₂ (g)+ 4H₂O (g) The reaction of 2.5 mol of O₂ will produce ________ mol of H₂O.

Accepted Answer

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Question 18

A 22.5-g sample of ammonium carbonate contains ________ mol of ammonium ions.

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Question 19

Lithium and nitrogen react in a combination reaction to produce lithium nitride: 6Li (s)+ N₂(g)→ 2Li₃N (s) How many moles of lithium are needed to produce 0.45 mol of Li₃N when the reaction is carried out in the presence of excess nitrogen?

Accepted Answer

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Question 20

How many atoms of carbon are in 23.1 g of glucose (C₆H₁₂O₆)?

Accepted Answer

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Quiz 3: Chemical Reactions and Reaction Stoichiometry

The combustion of ammonia in the presence of excess oxygen yields NO₂ and H₂O: 4 NH₃ (g) + 7 O₂ (g) → 4 NO₂ (g) + 6 H₂O (g) The combustion of 14.4 g of ammonia consumes ________ g of oxygen.

How many moles of lithium phosphate (Li₃PO₄) are contained in 66.6 g of lithium phosphate?

A 1.36-g sample of magnesium nitrate,Mg(NO₃) ₂,contains ________ mol of this compound.

Magnesium burns in air with a dazzling brilliance to produce magnesium oxide: 2Mg (s) + O₂(g) → 2MgO (s) How many moles of O₂are consumed when 3.55 mol of magnesium burns?

How many grams of calcium cyanide (Ca(CN) ₂) are contained in 0.69 mol of calcium cyanide?

Magnesium and nitrogen react in a combination reaction to produce magnesium nitride: 3 Mg + N₂ → Mg₃N₂ In a particular experiment,a 8.33-g sample of reacts completely.The mass of Mg consumed is ________ g.

A certain alcohol contains only three elements,carbon,hydrogen,and oxygen.Combustion of a 60.00 gram sample of the alcohol produced 114.6 grams of CO₂ and 70.44 grams of H₂O.What is the empirical formula of the alcohol?

How many grams of phenol (C₆H₅OH) are contained in 5.50 mol of phenol?

Lithium and nitrogen react to produce lithium nitride: 6Li (s) + N₂ (g) → 2Li₃N (s) How many moles of N₂are needed to react with 0.550 mol of lithium?

Lithium and nitrogen react to produce lithium nitride: 6Li (s) + N₂(g) → 2Li₃N (s) How many moles of lithium nitride are produced when 0.330 mol of lithium react in this fashion?

Automotive air bags inflate when sodium azide decomposes explosively to its constituent elements: 2NaN₃ (s) → 2Na (s) + 3N₂ (g) How many moles of N₂are produced by the decomposition of 1.75 mol of sodium azide?

What is the empirical formula of a compound that is 66.6% C,11.2% H,and 22.2% O by mass?

How many moles of pyridine (C₅H₅N) are contained in 4.14 g of pyridine?

What is the mass in grams of 2.00 × 10⁵atoms of naturally occurring neon?

What is the mass in grams of 9.76 × 10¹² atoms of naturally occurring potassium?

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 28.0 g of nitrogen?

The combustion of propane (C₃H₈) produces CO₂ and H₂O: C₃H₈ (g) + 5O₂(g) → 3CO₂ (g) + 4H₂O (g) The reaction of 2.5 mol of O₂ will produce ________ mol of H₂O.

A 22.5-g sample of ammonium carbonate contains ________ mol of ammonium ions.

Lithium and nitrogen react in a combination reaction to produce lithium nitride: 6Li (s) + N₂(g) → 2Li₃N (s) How many moles of lithium are needed to produce 0.45 mol of Li₃N when the reaction is carried out in the presence of excess nitrogen?

How many atoms of carbon are in 23.1 g of glucose (C₆H₁₂O₆) ?

Quiz 3: Chemical Reactions and Reaction Stoichiometry

The combustion of ammonia in the presence of excess oxygen yields NO2 and H2O: 4 NH3 (g) + 7 O2 (g) → 4 NO2 (g) + 6 H2O (g) The combustion of 14.4 g of ammonia consumes ________ g of oxygen.

How many moles of lithium phosphate (Li3PO4) are contained in 66.6 g of lithium phosphate?

A 1.36-g sample of magnesium nitrate,Mg(NO3) 2,contains ________ mol of this compound.

Magnesium burns in air with a dazzling brilliance to produce magnesium oxide: 2Mg (s) + O2(g) → 2MgO (s) How many moles of O2 are consumed when 3.55 mol of magnesium burns?

How many grams of calcium cyanide (Ca(CN) 2) are contained in 0.69 mol of calcium cyanide?

Magnesium and nitrogen react in a combination reaction to produce magnesium nitride: 3 Mg + N2 → Mg3N2 In a particular experiment,a 8.33-g sample of reacts completely.The mass of Mg consumed is ________ g.

A certain alcohol contains only three elements,carbon,hydrogen,and oxygen.Combustion of a 60.00 gram sample of the alcohol produced 114.6 grams of CO2 and 70.44 grams of H2O.What is the empirical formula of the alcohol?

How many grams of phenol (C6H5OH) are contained in 5.50 mol of phenol?

Lithium and nitrogen react to produce lithium nitride: 6Li (s) + N2 (g) → 2Li3N (s) How many moles of N2 are needed to react with 0.550 mol of lithium?

Lithium and nitrogen react to produce lithium nitride: 6Li (s) + N2 (g) → 2Li3N (s) How many moles of lithium nitride are produced when 0.330 mol of lithium react in this fashion?

Automotive air bags inflate when sodium azide decomposes explosively to its constituent elements: 2NaN3 (s) → 2Na (s) + 3N2 (g) How many moles of N2 are produced by the decomposition of 1.75 mol of sodium azide?

What is the empirical formula of a compound that is 66.6% C,11.2% H,and 22.2% O by mass?

How many moles of pyridine (C5H5N) are contained in 4.14 g of pyridine?

What is the mass in grams of 2.00 × 105 atoms of naturally occurring neon?

What is the mass in grams of 9.76 × 1012 atoms of naturally occurring potassium?

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 28.0 g of nitrogen?

The combustion of propane (C3H8) produces CO2 and H2O: C3H8 (g) + 5O2 (g) → 3CO2 (g) + 4H2O (g) The reaction of 2.5 mol of O2 will produce ________ mol of H2O.

A 22.5-g sample of ammonium carbonate contains ________ mol of ammonium ions.

Lithium and nitrogen react in a combination reaction to produce lithium nitride: 6Li (s) + N2 (g) → 2Li3N (s) How many moles of lithium are needed to produce 0.45 mol of Li3N when the reaction is carried out in the presence of excess nitrogen?

How many atoms of carbon are in 23.1 g of glucose (C6H12O6) ?

The combustion of ammonia in the presence of excess oxygen yields NO₂ and H₂O: 4 NH₃ (g) + 7 O₂ (g) → 4 NO₂ (g) + 6 H₂O (g) The combustion of 14.4 g of ammonia consumes ________ g of oxygen.

How many moles of lithium phosphate (Li₃PO₄) are contained in 66.6 g of lithium phosphate?

A 1.36-g sample of magnesium nitrate,Mg(NO₃) ₂,contains ________ mol of this compound.

Magnesium burns in air with a dazzling brilliance to produce magnesium oxide: 2Mg (s) + O₂(g) → 2MgO (s) How many moles of O₂are consumed when 3.55 mol of magnesium burns?

How many grams of calcium cyanide (Ca(CN) ₂) are contained in 0.69 mol of calcium cyanide?

Magnesium and nitrogen react in a combination reaction to produce magnesium nitride: 3 Mg + N₂ → Mg₃N₂ In a particular experiment,a 8.33-g sample of reacts completely.The mass of Mg consumed is ________ g.

A certain alcohol contains only three elements,carbon,hydrogen,and oxygen.Combustion of a 60.00 gram sample of the alcohol produced 114.6 grams of CO₂ and 70.44 grams of H₂O.What is the empirical formula of the alcohol?

How many grams of phenol (C₆H₅OH) are contained in 5.50 mol of phenol?

Lithium and nitrogen react to produce lithium nitride: 6Li (s) + N₂ (g) → 2Li₃N (s) How many moles of N₂are needed to react with 0.550 mol of lithium?

Lithium and nitrogen react to produce lithium nitride: 6Li (s) + N₂(g) → 2Li₃N (s) How many moles of lithium nitride are produced when 0.330 mol of lithium react in this fashion?

Automotive air bags inflate when sodium azide decomposes explosively to its constituent elements: 2NaN₃ (s) → 2Na (s) + 3N₂ (g) How many moles of N₂are produced by the decomposition of 1.75 mol of sodium azide?

How many moles of pyridine (C₅H₅N) are contained in 4.14 g of pyridine?

What is the mass in grams of 2.00 × 10⁵atoms of naturally occurring neon?

What is the mass in grams of 9.76 × 10¹² atoms of naturally occurring potassium?

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 28.0 g of nitrogen?

The combustion of propane (C₃H₈) produces CO₂ and H₂O: C₃H₈ (g) + 5O₂(g) → 3CO₂ (g) + 4H₂O (g) The reaction of 2.5 mol of O₂ will produce ________ mol of H₂O.

Lithium and nitrogen react in a combination reaction to produce lithium nitride: 6Li (s) + N₂(g) → 2Li₃N (s) How many moles of lithium are needed to produce 0.45 mol of Li₃N when the reaction is carried out in the presence of excess nitrogen?

How many atoms of carbon are in 23.1 g of glucose (C₆H₁₂O₆) ?