Question 1

Traumatic acid,an organic acid with a molar mass of 228 g/mol,is composed of carbon,hydrogen,and oxygen.Analysis of a 10.000 g sample yielded 6.314 g C and 0.883 g H.What is its molecular formula?

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Question 2

For which of the following compounds are the empirical and molecular formulas the same? Acetic acid,found in vinegar,CH₃COOH Formaldehyde,used to preserve biological specimens,CH₂O Ethanol,found in beer and wine,CH₃CH₂OH

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Question 3

Calcium carbide (CaC_2, 64.10 g/mol)reacts with water (18.02 g/mol)to produce acetylene gas (C₂H₂,26.04 g/mol),which is used in welding applications.The other reaction product is calcium hydroxide (Ca(OH)₂,74.10 g/mol).How many kilograms of C₂H₂ can be produced from 75.0 kg CaC₂?

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The answer of Calcium carbide (CaC_2, 64.10 g/mol)reacts with water...

Question 4

Bullvalene is 92.26% C and 7.74% H; its molar mass is 130.19 g/mol.What is its molecular formula?

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The answer of Bullvalene is 92.26% C and 7.74% H;...

Question 5

Methylheptenone (MHP),which is used in producing lemon fragrances and flavors,contains carbon,hydrogen,and oxygen.The complete combustion of 192 mg MHP produces 536 mg CO₂ and 192 mg H₂O.Mass spectrometry experiments showed that its molar mass is less than 200 g/mol.What is the molecular formula of MHP?

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The answer of Methylheptenone (MHP),which is used in producing lemon...

Question 6

n-Heptane (C₇H₁₄,98.19 g/mol)is an undesirable component of gasoline because it burns explosively and contributes to engine "knocking." Write the balanced combustion reaction of C₇H₁₄.Calculate the number of grams of C₇H₁₄ that react if 125 g CO₂ (44.01 g/mol)are produced.

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The answer of n-Heptane (C₇H₁₄,98.19 g/mol)is an undesirable component of...

Question 7

Give the empirical formula for each of the following compounds: H₂O,H₂O₂,NH₃,N₂H₄,C₁₂H₂₂O₁₁,Al₂Cl₆.

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Question 8

List three reasons why the actual yield for a chemical reaction may differ from the theoretical yield.

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Question 9

Na₂B₄O₅(OH)₄.8 H₂O,commonly known as borax,is used in a variety of applications,including as a fire retardant,an antifungal agent,a flux in metallurgy,a texturing agent in cooking,and a precursor for other boron compounds.How many cubic meters of borax (381.37 g/mol; 1.73 g/cm³)would be required to produce 250 kg elemental boron?

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The answer of Na₂B₄O₅(OH)₄.8 H₂O,commonly known as...

Question 10

White phosphorus (123.88 g/mol)is produced by the reaction of calcium phosphate (310.18 g/mol),silicon dioxide (60.09 g/mol),and carbon (12.01 g/mol).How many grams of P₄ are produced when 750 g Ca₃(PO₄)₂ reacts with excess SiO₂ and C? Assume 100% yield. 2 Ca₃(PO₄)₂(s)+ 6 SiO₂(s)+ 10 C(s)$\to$ P₄(s)+ 6 CaSiO₃(s)+ 10 CO(g)

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The answer of White phosphorus (123.88 g/mol)is produced by the...

Question 11

In addition to Rb₂S,rubidium forms a number of compounds with sulfur.Find the mass percent Rb in Rb₂S,Rb₂S₃,and Rb₂S₆ to two decimal places.

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Question 12

Without doing any calculations,identify which of the following compounds has the largest percent sodium by mass and which has the smallest.Explain your logic. sodium oxide,Na₂O; sodium hydroxide,NaOH; sodium hydrogen carbonate,NaHCO₃, sodium carbonate,Na₂CO₃; sodium peroxide,Na₂O₂

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Question 13

Megaphone,a cytotoxic molecule isolated from a flowering plant of the laurel family,contains carbon,hydrogen,and oxygen.The complete combustion of a 2.0000 g sample in excess O₂ produces 4.9590 g CO₂ and 1.3837 g H₂O.Mass spectrometry experiments showed that megaphone's molecular mass is approximately 390 amu.What is the molecular formula of megaphone?

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The answer of Megaphone,a cytotoxic molecule isolated from a flowering...

Question 14

Mesitylene is a liquid hydrocarbon.If 0.115 g of this compound is burned in pure oxygen to give 0.3790 g CO₂ and 0.1035 g H₂O,what is the empirical formula of the compound?

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The answer of Mesitylene is a liquid hydrocarbon.If 0.115 g...

Question 15

Cadaverine is composed of carbon,hydrogen,and nitrogen.A 20.000 g sample was found to contain 11.754 g C and 2.762 g H.Find the empirical formula of cadaverine.

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Question 16

Which of the following oxides of nitrogen have the same empirical formulas? N₂O,NO,NO₂,N₂O₂,N₂O₄

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Question 17

Diethyl azodicarboxylate,or DEAD,is an explosive compound with the empirical formula C₃H₅NO₂ and a molecular mass of approximately 174 amu.Find its molecular formula.

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The answer of Diethyl azodicarboxylate,or DEAD,is an explosive compound with...

Question 18

Carbon emissions by China in 2012 were estimated at approximately 2.6 $\times$ 10⁹ metric tons (1 metric ton = 1000 kg).This is equivalent to how many kilograms of CO₂?

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Question 19

Manganese reacts with halogens to give metal halides.How many grams of MnF₃ (111.9 g/mol)can be produced using excess fluorine (38.0 g/mol)and 5.49 g Mn (54.9 g/mol)? 2 Mn(s)+ 3 F₂(g)$\to$ 2 MnF₃(s)

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Question 20

Angelic acid is 59.98% C,8.05% H,and 31.96% O by mass.Find its empirical formula.

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The answer of Angelic acid is 59.98% C,8.05% H,and 31.96%...

Quiz 7: Stoichiometry-Mass Relationships and Chemical Reactions

Traumatic acid,an organic acid with a molar mass of 228 g/mol,is composed of carbon,hydrogen,and oxygen.Analysis of a 10.000 g sample yielded 6.314 g C and 0.883 g H.What is its molecular formula?

For which of the following compounds are the empirical and molecular formulas the same? Acetic acid,found in vinegar,CH₃COOH Formaldehyde,used to preserve biological specimens,CH₂O Ethanol,found in beer and wine,CH₃CH₂OH

Calcium carbide (CaC_2, 64.10 g/mol)reacts with water (18.02 g/mol)to produce acetylene gas (C₂H₂,26.04 g/mol),which is used in welding applications.The other reaction product is calcium hydroxide (Ca(OH)₂,74.10 g/mol).How many kilograms of C₂H₂ can be produced from 75.0 kg CaC₂?

Bullvalene is 92.26% C and 7.74% H; its molar mass is 130.19 g/mol.What is its molecular formula?

n-Heptane (C₇H₁₄,98.19 g/mol)is an undesirable component of gasoline because it burns explosively and contributes to engine "knocking." Write the balanced combustion reaction of C₇H₁₄.Calculate the number of grams of C₇H₁₄ that react if 125 g CO₂ (44.01 g/mol)are produced.

Give the empirical formula for each of the following compounds: H₂O,H₂O₂,NH₃,N₂H₄,C₁₂H₂₂O₁₁,Al₂Cl₆.

List three reasons why the actual yield for a chemical reaction may differ from the theoretical yield.

In addition to Rb₂S,rubidium forms a number of compounds with sulfur.Find the mass percent Rb in Rb₂S,Rb₂S₃,and Rb₂S₆ to two decimal places.

Without doing any calculations,identify which of the following compounds has the largest percent sodium by mass and which has the smallest.Explain your logic. sodium oxide,Na₂O; sodium hydroxide,NaOH; sodium hydrogen carbonate,NaHCO₃, sodium carbonate,Na₂CO₃; sodium peroxide,Na₂O₂

Mesitylene is a liquid hydrocarbon.If 0.115 g of this compound is burned in pure oxygen to give 0.3790 g CO₂ and 0.1035 g H₂O,what is the empirical formula of the compound?

Cadaverine is composed of carbon,hydrogen,and nitrogen.A 20.000 g sample was found to contain 11.754 g C and 2.762 g H.Find the empirical formula of cadaverine.

Which of the following oxides of nitrogen have the same empirical formulas? N₂O,NO,NO₂,N₂O₂,N₂O₄

Diethyl azodicarboxylate,or DEAD,is an explosive compound with the empirical formula C₃H₅NO₂ and a molecular mass of approximately 174 amu.Find its molecular formula.

Carbon emissions by China in 2012 were estimated at approximately 2.6 $\times$ 10⁹ metric tons (1 metric ton = 1000 kg).This is equivalent to how many kilograms of CO₂?

Manganese reacts with halogens to give metal halides.How many grams of MnF₃ (111.9 g/mol)can be produced using excess fluorine (38.0 g/mol)and 5.49 g Mn (54.9 g/mol)? 2 Mn(s)+ 3 F₂(g) $\to$ 2 MnF₃(s)

Angelic acid is 59.98% C,8.05% H,and 31.96% O by mass.Find its empirical formula.

Quiz 7: Stoichiometry-Mass Relationships and Chemical Reactions

Traumatic acid,an organic acid with a molar mass of 228 g/mol,is composed of carbon,hydrogen,and oxygen.Analysis of a 10.000 g sample yielded 6.314 g C and 0.883 g H.What is its molecular formula?

For which of the following compounds are the empirical and molecular formulas the same? Acetic acid,found in vinegar,CH3COOH Formaldehyde,used to preserve biological specimens,CH2O Ethanol,found in beer and wine,CH3CH2OH

Calcium carbide (CaC2, 64.10 g/mol)reacts with water (18.02 g/mol)to produce acetylene gas (C2H2,26.04 g/mol),which is used in welding applications.The other reaction product is calcium hydroxide (Ca(OH)2,74.10 g/mol).How many kilograms of C2H2 can be produced from 75.0 kg CaC2?

Bullvalene is 92.26% C and 7.74% H; its molar mass is 130.19 g/mol.What is its molecular formula?

n-Heptane (C7H14,98.19 g/mol)is an undesirable component of gasoline because it burns explosively and contributes to engine "knocking." Write the balanced combustion reaction of C7H14.Calculate the number of grams of C7H14 that react if 125 g CO2 (44.01 g/mol)are produced.

Give the empirical formula for each of the following compounds: H2O,H2O2,NH3,N2H4,C12H22O11,Al2Cl6.

List three reasons why the actual yield for a chemical reaction may differ from the theoretical yield.

In addition to Rb2S,rubidium forms a number of compounds with sulfur.Find the mass percent Rb in Rb2S,Rb2S3,and Rb2S6 to two decimal places.

Without doing any calculations,identify which of the following compounds has the largest percent sodium by mass and which has the smallest.Explain your logic. sodium oxide,Na2O; sodium hydroxide,NaOH; sodium hydrogen carbonate,NaHCO3, sodium carbonate,Na2CO3; sodium peroxide,Na2O2

Mesitylene is a liquid hydrocarbon.If 0.115 g of this compound is burned in pure oxygen to give 0.3790 g CO2 and 0.1035 g H2O,what is the empirical formula of the compound?

Cadaverine is composed of carbon,hydrogen,and nitrogen.A 20.000 g sample was found to contain 11.754 g C and 2.762 g H.Find the empirical formula of cadaverine.

Which of the following oxides of nitrogen have the same empirical formulas? N2O,NO,NO2,N2O2,N2O4

Diethyl azodicarboxylate,or DEAD,is an explosive compound with the empirical formula C3H5NO2 and a molecular mass of approximately 174 amu.Find its molecular formula.

Carbon emissions by China in 2012 were estimated at approximately 2.6 ×\times× 109 metric tons (1 metric ton = 1000 kg).This is equivalent to how many kilograms of CO2?

Manganese reacts with halogens to give metal halides.How many grams of MnF3 (111.9 g/mol)can be produced using excess fluorine (38.0 g/mol)and 5.49 g Mn (54.9 g/mol)? 2 Mn(s)+ 3 F2(g) →\to→ 2 MnF3(s)

Angelic acid is 59.98% C,8.05% H,and 31.96% O by mass.Find its empirical formula.

For which of the following compounds are the empirical and molecular formulas the same? Acetic acid,found in vinegar,CH₃COOH Formaldehyde,used to preserve biological specimens,CH₂O Ethanol,found in beer and wine,CH₃CH₂OH

Calcium carbide (CaC_2, 64.10 g/mol)reacts with water (18.02 g/mol)to produce acetylene gas (C₂H₂,26.04 g/mol),which is used in welding applications.The other reaction product is calcium hydroxide (Ca(OH)₂,74.10 g/mol).How many kilograms of C₂H₂ can be produced from 75.0 kg CaC₂?

n-Heptane (C₇H₁₄,98.19 g/mol)is an undesirable component of gasoline because it burns explosively and contributes to engine "knocking." Write the balanced combustion reaction of C₇H₁₄.Calculate the number of grams of C₇H₁₄ that react if 125 g CO₂ (44.01 g/mol)are produced.

Give the empirical formula for each of the following compounds: H₂O,H₂O₂,NH₃,N₂H₄,C₁₂H₂₂O₁₁,Al₂Cl₆.

In addition to Rb₂S,rubidium forms a number of compounds with sulfur.Find the mass percent Rb in Rb₂S,Rb₂S₃,and Rb₂S₆ to two decimal places.

Without doing any calculations,identify which of the following compounds has the largest percent sodium by mass and which has the smallest.Explain your logic. sodium oxide,Na₂O; sodium hydroxide,NaOH; sodium hydrogen carbonate,NaHCO₃, sodium carbonate,Na₂CO₃; sodium peroxide,Na₂O₂

Mesitylene is a liquid hydrocarbon.If 0.115 g of this compound is burned in pure oxygen to give 0.3790 g CO₂ and 0.1035 g H₂O,what is the empirical formula of the compound?

Which of the following oxides of nitrogen have the same empirical formulas? N₂O,NO,NO₂,N₂O₂,N₂O₄

Diethyl azodicarboxylate,or DEAD,is an explosive compound with the empirical formula C₃H₅NO₂ and a molecular mass of approximately 174 amu.Find its molecular formula.

Carbon emissions by China in 2012 were estimated at approximately 2.6 $\times$ 10⁹ metric tons (1 metric ton = 1000 kg).This is equivalent to how many kilograms of CO₂?

Manganese reacts with halogens to give metal halides.How many grams of MnF₃ (111.9 g/mol)can be produced using excess fluorine (38.0 g/mol)and 5.49 g Mn (54.9 g/mol)? 2 Mn(s)+ 3 F₂(g) $\to$ 2 MnF₃(s)