Consider the following three samples. A.A sample containing 180 g glucose (C6H12O6) B.A sample containing 90 g glucose and 90 g mannose (C6H12O6) C.A sample containing 180 g mannose Which statement is correct?

A) All three samples have the same number of oxygen atoms. B) Both samples A and C have the same number of oxygen atoms,but more than in sample B. C) Sample B has more oxygen atoms than sample A or sample C. D) Sample C has more oxygen atoms than sample A or sample B E) Sample A has more oxygen atoms than sample B or sample C. A) All three samples have the same number of oxygen atoms. B) Both samples A and C have the same number of oxygen atoms,but more than in sample B. C) Sample B has more oxygen atoms than sample A or sample C. D) Sample C has more oxygen atoms than sample A or sample B E) Sample A has more oxygen atoms than sample B or sample C.

What is the molecular mass of cycloheptane,C7H14?

A) 13.02 amu B) 1191.19 amu C) 85.08 amu D) 98.19 amu E) 26.12 amu A) 13.02 amu B) 1191.19 amu C) 85.08 amu D) 98.19 amu E) 26.12 amu

The formula mass of zinc acetate trihydrate,Zn(CH3COO)2 • 3H2O,is

A) 356 amu. B) 184 amu. C) 292 amu. D) 238 amu. E) 156 amu. A) 356 amu. B) 184 amu. C) 292 amu. D) 238 amu. E) 156 amu.

A single molecule of polystryene has the repeating unit -[CH2CH(C6H5)]n-,where n is the number of repeating units.What is the value of n if the molecular mass of a single polymer chain is amu?

A) units. B) units. C) units. D) units. E) units. A) units. B) units. C) units. D) units. E) units.

A sample of ammonium phosphate,(NH4)3PO4,contains 0.104 mol of nitrogen atoms.The number of moles of oxygen atoms in the sample is

A) 0.139 mol. B) 0.0104 mol. C) 0.41 mol. D) 0.419 mol. E) 4.6 mol. A) 0.139 mol. B) 0.0104 mol. C) 0.41 mol. D) 0.419 mol. E) 4.6 mol.

Exam 3: Calculations With Chemical Formulas and Equations

Analysis of a compound containing only C and Cl revealed that it contains 33.33 % C atoms by number and has a molar mass of 248.75 g/mol.What is the molecular formula of this compound?

(Multiple Choice)

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Question 81

How many grams of hydrogen atoms are present in 16.4 g of water?

(Multiple Choice)

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Question 82

Consider the following three samples. A.A sample containing 180 g glucose (C₆H₁₂O₆) B.A sample containing 90 g glucose and 90 g mannose (C₆H₁₂O₆) C.A sample containing 180 g mannose Which statement is correct?

(Multiple Choice)

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Question 83

What is the molecular mass of cycloheptane,C₇H₁₄?

(Multiple Choice)

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Question 84

The formula mass of zinc acetate trihydrate,Zn(CH₃COO)₂ • 3H₂O,is

(Multiple Choice)

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Question 85

Which of the following samples contains the largest number of atoms?

(Multiple Choice)

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Question 86

A single molecule of polystryene has the repeating unit -[CH₂CH(C₆H₅)]_n-,where n is the number of repeating units.What is the value of n if the molecular mass of a single polymer chain is amu?

(Multiple Choice)

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Question 87

One step in the isolation of pure rhodium metal (Rh)is the precipitation of rhodium(III)hydroxide from a solution containing rhodium(III)sulfate according to the following balanced chemical equation: Rh₂(SO₄)₃(aq)+ 6NaOH(aq)→ 2Rh(OH)₃(s)+ 3Na₂SO₄(aq) If 0.730 g of rhodium(III)hydroxide is produced,what mass of sodium sulfate is also produced?

(Multiple Choice)

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Question 88

A sample of ammonium phosphate,(NH₄)₃PO₄,contains 0.104 mol of nitrogen atoms.The number of moles of oxygen atoms in the sample is

(Multiple Choice)

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Question 89

A compound is composed of only C and Cl.It contains 18.42 % C by mass and has a molar mass of 260.76 g/mol.What is its molecular formula?

(Multiple Choice)

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Question 90

A sample of thallium(III)peroxide,Tl₂(O₂)₃,contains 2.45 mol of thallium(III)ions.The number of moles of peroxide ions in the sample is

(Multiple Choice)

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Question 91

The empirical formula for a group of compounds is CHCl.Lindane,a powerful insecticide,is a member of this group.The molar mass of lindane is 290.8.How many atoms of carbon does a molecule of lindane contain?

(Multiple Choice)

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Question 92

Monodisperse polyacrylonitrile contains molecules with the general formula -(CH₂CHCN)_n-,where n is typically greater than 10,000.Given that a sample of monodisperse polyacrilonitrile weighs 676.8 g and contains molecules of -(CH₂CHCN)_n-,calculate n.

(Multiple Choice)

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Question 93

An ore sample with a mass of 92.3 g is found to contain 17.7% by mass iron.What mass of iron is contained in the ore?

(Multiple Choice)

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Question 94

What is the percentage by mass of nitrogen in ammonium phosphate,(NH₄)₃PO₄?

(Multiple Choice)

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Question 95

The fully hydrated form of sodium sulfate is the decahydrate,Na₂SO₄ • 10H₂O.When heated the hydrated salt loses water.How many water molecules are found per formula unit in a partially dehydrated sample of sodium sulfate with a formula mass of 197 amu (i.e.find n for Na₂SO₄ • nH₂O)?

(Multiple Choice)

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Question 96

A compound contains 43.84 % carbon atoms,3.65% hydrogen atoms,and 8.68 % fluorine atoms by mass.Each molecule of this compound contains one fluorine atom.What is the total number of carbon,hydrogen,and fluorine atoms in one molecule of this compound?

(Multiple Choice)

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Question 97

A 0.4647-g sample of a compound known to contain only carbon,hydrogen,and oxygen was burned in dioxygen to yield 0.01962 mol of CO₂ and 0.01961 mol of H₂O.What is the empirical formula of the compound?

(Multiple Choice)

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Question 98

Which of the following compounds has the same percentage of carbon and hydrogen by mass as cyclohexane,C₆H₁₂?

(Multiple Choice)

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Question 99

How many molecules are there in 104 g of pentylene glycol,HO(CH₂)₅OH?

(Multiple Choice)

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Question 100

Showing 81 - 100 of 139

Exam 3: Calculations With Chemical Formulas and Equations

Analysis of a compound containing only C and Cl revealed that it contains 33.33 % C atoms by number and has a molar mass of 248.75 g/mol.What is the molecular formula of this compound?

How many grams of hydrogen atoms are present in 16.4 g of water?

Consider the following three samples. A.A sample containing 180 g glucose (C6H12O6) B.A sample containing 90 g glucose and 90 g mannose (C6H12O6) C.A sample containing 180 g mannose Which statement is correct?

What is the molecular mass of cycloheptane,C7H14?

The formula mass of zinc acetate trihydrate,Zn(CH3COO)2 • 3H2O,is

Which of the following samples contains the largest number of atoms?

A single molecule of polystryene has the repeating unit -[CH2CH(C6H5)]n-,where n is the number of repeating units.What is the value of n if the molecular mass of a single polymer chain is amu?

A sample of ammonium phosphate,(NH4)3PO4,contains 0.104 mol of nitrogen atoms.The number of moles of oxygen atoms in the sample is

A compound is composed of only C and Cl.It contains 18.42 % C by mass and has a molar mass of 260.76 g/mol.What is its molecular formula?

A sample of thallium(III)peroxide,Tl2(O2)3,contains 2.45 mol of thallium(III)ions.The number of moles of peroxide ions in the sample is

The empirical formula for a group of compounds is CHCl.Lindane,a powerful insecticide,is a member of this group.The molar mass of lindane is 290.8.How many atoms of carbon does a molecule of lindane contain?

Monodisperse polyacrylonitrile contains molecules with the general formula -(CH2CHCN)n-,where n is typically greater than 10,000.Given that a sample of monodisperse polyacrilonitrile weighs 676.8 g and contains molecules of -(CH2CHCN)n-,calculate n.

An ore sample with a mass of 92.3 g is found to contain 17.7% by mass iron.What mass of iron is contained in the ore?

What is the percentage by mass of nitrogen in ammonium phosphate,(NH4)3PO4?

The fully hydrated form of sodium sulfate is the decahydrate,Na2SO4 • 10H2O.When heated the hydrated salt loses water.How many water molecules are found per formula unit in a partially dehydrated sample of sodium sulfate with a formula mass of 197 amu (i.e.find n for Na2SO4 • nH2O)?

A compound contains 43.84 % carbon atoms,3.65% hydrogen atoms,and 8.68 % fluorine atoms by mass.Each molecule of this compound contains one fluorine atom.What is the total number of carbon,hydrogen,and fluorine atoms in one molecule of this compound?

A 0.4647-g sample of a compound known to contain only carbon,hydrogen,and oxygen was burned in dioxygen to yield 0.01962 mol of CO2 and 0.01961 mol of H2O.What is the empirical formula of the compound?

Which of the following compounds has the same percentage of carbon and hydrogen by mass as cyclohexane,C6H12?

How many molecules are there in 104 g of pentylene glycol,HO(CH2)5OH?

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Consider the following three samples. A.A sample containing 180 g glucose (C₆H₁₂O₆) B.A sample containing 90 g glucose and 90 g mannose (C₆H₁₂O₆) C.A sample containing 180 g mannose Which statement is correct?

What is the molecular mass of cycloheptane,C₇H₁₄?

The formula mass of zinc acetate trihydrate,Zn(CH₃COO)₂ • 3H₂O,is

A single molecule of polystryene has the repeating unit -[CH₂CH(C₆H₅)]_n-,where n is the number of repeating units.What is the value of n if the molecular mass of a single polymer chain is amu?

A sample of ammonium phosphate,(NH₄)₃PO₄,contains 0.104 mol of nitrogen atoms.The number of moles of oxygen atoms in the sample is

A sample of thallium(III)peroxide,Tl₂(O₂)₃,contains 2.45 mol of thallium(III)ions.The number of moles of peroxide ions in the sample is

Monodisperse polyacrylonitrile contains molecules with the general formula -(CH₂CHCN)_n-,where n is typically greater than 10,000.Given that a sample of monodisperse polyacrilonitrile weighs 676.8 g and contains molecules of -(CH₂CHCN)_n-,calculate n.

What is the percentage by mass of nitrogen in ammonium phosphate,(NH₄)₃PO₄?

The fully hydrated form of sodium sulfate is the decahydrate,Na₂SO₄ • 10H₂O.When heated the hydrated salt loses water.How many water molecules are found per formula unit in a partially dehydrated sample of sodium sulfate with a formula mass of 197 amu (i.e.find n for Na₂SO₄ • nH₂O)?

A 0.4647-g sample of a compound known to contain only carbon,hydrogen,and oxygen was burned in dioxygen to yield 0.01962 mol of CO₂ and 0.01961 mol of H₂O.What is the empirical formula of the compound?

Which of the following compounds has the same percentage of carbon and hydrogen by mass as cyclohexane,C₆H₁₂?

How many molecules are there in 104 g of pentylene glycol,HO(CH₂)₅OH?