What mass of FeS is formed if 9.42 g of Fe reacts with 68.0 g of S8? 8Fe(s)+ S8(s)→ 8FeS(s)

A) 186 g B) 142 g C) 119 g D) 14.8 g E) 0.169 g A) 186 g B) 142 g C) 119 g D) 14.8 g E) 0.169 g

Potassium chlorate (used in fireworks,flares,and safety matches)forms oxygen and potassium chloride when heated. KClO3(s)→ KCl(s)+ O2(g)[unbalanced] What mass of oxygen gas is formed if 26.4 g of potassium chlorate decomposes completely?

A) 223 g B) 99.1 g C) 10.3 g D) 6.86 g E) 4.60 g A) 223 g B) 99.1 g C) 10.3 g D) 6.86 g E) 4.60 g

What is the maximum number of grams of ammonia,NH3,which can be obtained from the reaction of 10.0 g of H2 and 80.0 g of N2? N2 + 3H2 → 2NH3

A) 34.1 g B) 48.6 g C) 56.3 g D) 90.0 g E) 97.3 g A) 34.1 g B) 48.6 g C) 56.3 g D) 90.0 g E) 97.3 g

What is the mass of 1.63 × 1021 atoms of silicon? (NA = 6.022 × 1023 mol-1)

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

One way of obtaining pure sodium carbonate is through the decomposition of the mineral trona, Na3(CO3) (HCO3)·2H2O. 2Na3(CO3) (HCO3)·2H2O(s)→ 3Na2CO3(s)+ CO2(g)+ 5H2O(g) When 1.00 metric ton (1.00 × 103 kg)of trona is decomposed,0.650 metric ton of Na2CO3 is recovered.What is the percent yield of this reaction?

A) 92.4% B) 72.1% C) 65.0% D) 48.1% E) 35.0% A) 92.4% B) 72.1% C) 65.0% D) 48.1% E) 35.0%

Exam 3: Stoichiometry Ratios of Combination

The percent composition by mass of a compound is 76.0% C,12.8% H,and 11.2% O.The molar mass of this compound is 284.5 g/mol.What is the molecular formula of the compound?

(Multiple Choice)

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Question 81

Many compounds can be represented with the same empirical formula.

(True/False)

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Question 82

What mass of FeS is formed if 9.42 g of Fe reacts with 68.0 g of S₈? 8Fe(s)+ S₈(s)→ 8FeS(s)

(Multiple Choice)

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Question 83

What is the percent sulfur in iron(III)sulfate?

(Multiple Choice)

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Question 84

Terephthalic acid,used in the production of polyester fibers and films,is composed of carbon,hydrogen,and oxygen.When 0.6943 g of terephthalic acid was subjected to combustion analysis,it produced 1.471 g CO₂ and 0.226 g H₂O.What is its empirical formula?

(Multiple Choice)

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Question 85

Potassium chlorate (used in fireworks,flares,and safety matches)forms oxygen and potassium chloride when heated. KClO₃(s)→ KCl(s)+ O₂(g)[unbalanced] What mass of oxygen gas is formed if 26.4 g of potassium chlorate decomposes completely?

(Multiple Choice)

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Question 86

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

(Multiple Choice)

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Question 87

If 3.41 g of nitrogen react with 2.79 g of hydrogen to produce ammonia,what is the limiting reactant and what mass of ammonia is produced?

(Multiple Choice)

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Question 88

There is only one distinct empirical formula for each compound that exists.

(True/False)

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Question 89

An oxide of gadolinium contains 86.76 mass % Gd.What is its empirical formula?

(Multiple Choice)

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Question 90

The empirical formula is the simplest whole number ratio of atoms representing a chemical formula of a molecule.

(True/False)

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Question 91

What is the maximum number of grams of ammonia,NH₃,which can be obtained from the reaction of 10.0 g of H₂ and 80.0 g of N₂? N₂ + 3H₂ → 2NH₃

(Multiple Choice)

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Question 92

Aluminum reacts with oxygen to produce aluminum oxide which can be used as an adsorbent,desiccant or catalyst for organic reactions.A mixture of 82.49 g of aluminum and 117.65 g of oxygen is allowed to react.Identify the limiting reactant and determine the mass of the excess reactant present in the vessel when the reaction is complete.

(Multiple Choice)

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Question 93

What is the mass of 1.63 × 10²¹ atoms of silicon? (N_A = 6.022 × 10²³ mol^-1)

(Multiple Choice)

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Question 94

Sulfur dioxide reacts with chlorine to produce thionyl chloride (used as a drying agent for inorganic halides)and dichlorine oxide (used as a bleach for wood,pulp and textiles). SO₂(g)+ 2Cl₂(g)→ SOCl₂(g)+ Cl₂O(g) If 0.400 mol of Cl₂ reacts with excess SO₂,how many moles of Cl₂O are formed?

(Multiple Choice)

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Question 95

How many grams are present in 0.885 moles of manganese?

(Multiple Choice)

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Question 96

What is the mass in grams of 0.250 mol of the common antacid calcium carbonate?

(Multiple Choice)

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Question 97

Once the following equation is balanced with the smallest set of whole number coefficients,what is the sum of the coefficients? (Don't forget to include coefficients of one.) _ CH₄ + _ Cl₂ → _ CCl₄ + _ HCl

(Multiple Choice)

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Question 98

What is the mass of one copper atom? (N_A = 6.022 × 1023 mol^-1)

(Multiple Choice)

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Question 99

One way of obtaining pure sodium carbonate is through the decomposition of the mineral trona, Na₃(CO₃) (HCO₃)·2H₂O. 2Na₃(CO₃) (HCO₃)·2H₂O(s)→ 3Na₂CO₃(s)+ CO₂(g)+ 5H₂O(g) When 1.00 metric ton (1.00 × 10³ kg)of trona is decomposed,0.650 metric ton of Na₂CO₃ is recovered.What is the percent yield of this reaction?

(Multiple Choice)

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Question 100

Showing 81 - 100 of 131

Exam 3: Stoichiometry Ratios of Combination

The percent composition by mass of a compound is 76.0% C,12.8% H,and 11.2% O.The molar mass of this compound is 284.5 g/mol.What is the molecular formula of the compound?

Many compounds can be represented with the same empirical formula.

What mass of FeS is formed if 9.42 g of Fe reacts with 68.0 g of S8? 8Fe(s)+ S8(s)→ 8FeS(s)

What is the percent sulfur in iron(III)sulfate?

Terephthalic acid,used in the production of polyester fibers and films,is composed of carbon,hydrogen,and oxygen.When 0.6943 g of terephthalic acid was subjected to combustion analysis,it produced 1.471 g CO2 and 0.226 g H2O.What is its empirical formula?

Potassium chlorate (used in fireworks,flares,and safety matches)forms oxygen and potassium chloride when heated. KClO3(s)→ KCl(s)+ O2(g)[unbalanced] What mass of oxygen gas is formed if 26.4 g of potassium chlorate decomposes completely?

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

If 3.41 g of nitrogen react with 2.79 g of hydrogen to produce ammonia,what is the limiting reactant and what mass of ammonia is produced?

There is only one distinct empirical formula for each compound that exists.

An oxide of gadolinium contains 86.76 mass % Gd.What is its empirical formula?

The empirical formula is the simplest whole number ratio of atoms representing a chemical formula of a molecule.

What is the maximum number of grams of ammonia,NH3,which can be obtained from the reaction of 10.0 g of H2 and 80.0 g of N2? N2 + 3H2 → 2NH3

What is the mass of 1.63 × 1021 atoms of silicon? (NA = 6.022 × 1023 mol-1)

Sulfur dioxide reacts with chlorine to produce thionyl chloride (used as a drying agent for inorganic halides)and dichlorine oxide (used as a bleach for wood,pulp and textiles). SO2(g)+ 2Cl2(g)→ SOCl2(g)+ Cl2O(g) If 0.400 mol of Cl2 reacts with excess SO2,how many moles of Cl2O are formed?

How many grams are present in 0.885 moles of manganese?

What is the mass in grams of 0.250 mol of the common antacid calcium carbonate?

Once the following equation is balanced with the smallest set of whole number coefficients,what is the sum of the coefficients? (Don't forget to include coefficients of one.) ___ CH4 + ___ Cl2 → ___ CCl4 + ___ HCl

What is the mass of one copper atom? (NA = 6.022 × 1023 mol-1)

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What mass of FeS is formed if 9.42 g of Fe reacts with 68.0 g of S₈? 8Fe(s)+ S₈(s)→ 8FeS(s)

Terephthalic acid,used in the production of polyester fibers and films,is composed of carbon,hydrogen,and oxygen.When 0.6943 g of terephthalic acid was subjected to combustion analysis,it produced 1.471 g CO₂ and 0.226 g H₂O.What is its empirical formula?

Potassium chlorate (used in fireworks,flares,and safety matches)forms oxygen and potassium chloride when heated. KClO₃(s)→ KCl(s)+ O₂(g)[unbalanced] What mass of oxygen gas is formed if 26.4 g of potassium chlorate decomposes completely?

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

What is the maximum number of grams of ammonia,NH₃,which can be obtained from the reaction of 10.0 g of H₂ and 80.0 g of N₂? N₂ + 3H₂ → 2NH₃

What is the mass of 1.63 × 10²¹ atoms of silicon? (N_A = 6.022 × 10²³ mol^-1)

Once the following equation is balanced with the smallest set of whole number coefficients,what is the sum of the coefficients? (Don't forget to include coefficients of one.) _ CH₄ + _ Cl₂ → _ CCl₄ + _ HCl

What is the mass of one copper atom? (N_A = 6.022 × 1023 mol^-1)