Styrene's empirical formula is CH.What mass of styrene contains 2.95 × 1021 atoms of hydrogen? The molar mass of styrene is 104 g/mol.

A) 0.0391 g B) 0.0636 g C) 0.509 g D) 0.0587 g E) 0.00489 g A) 0.0391 g B) 0.0636 g C) 0.509 g D) 0.0587 g E) 0.00489 g

The total number of oxygen atoms in 1.93 g of CaCO3 (MM = 100.0 g/mol)is

A) 2.24 × 1023. B) 4.65 × 1022. C) 3.49 × 1022. D) 1.92 × 1023. E) 5.81 × 1022. A) 2.24 × 1023. B) 4.65 × 1022. C) 3.49 × 1022. D) 1.92 × 1023. E) 5.81 × 1022.

A 3.903 g sample of a hydrocarbon is burned in an excess of dioxygen,producing 7.31177 g CO2 and 4.488 g H2O.What is the empirical formula of the hydrocarbon?

A) CH3 B) CH2 C) C2H3 D) CH4 E) CH A) CH3 B) CH2 C) C2H3 D) CH4 E) CH

What is the mass of oxygen atoms in 0.380 mol Fe(CO)5?

A) 21.2 g B) 74.4 g C) 30.4 g D) 6.08 g E) 22.8 g A) 21.2 g B) 74.4 g C) 30.4 g D) 6.08 g E) 22.8 g

Sulfur trioxide,SO3,is made from the oxidation of SO2,and the reaction is represented by the equation: 2SO2 + O2 → 2SO3 A 25-g sample of SO2 gives 18 g of SO3.The percent yield of SO3 is .

A) 9 % B) 58 % C) 14 % D) 31 % E) 100 % A) 9 % B) 58 % C) 14 % D) 31 % E) 100 %

The mineral leadhillite,which is essentially Pb4(SO4)(CO3)2(OH)2 (FW = 1079 g/mol),contains ____% hydrogen by mass.

A) 76.81 B) 0.1868 C) 2.226 D) 17.79 E) 2.971 A) 76.81 B) 0.1868 C) 2.226 D) 17.79 E) 2.971

Pure copper may be produced by the reaction of copper(I)sulfide with oxygen gas as follows: Cu2S(s)+ O2(g)→ 2Cu(s)+ SO2(g) If 0.190 kg of copper(I)sulfide reacts with excess oxygen,what mass of copper metal may be produced?

A) 0.19 kg B) 0.0379 kg C) 0.0758 kg D) 0.151 kg E) 0.38 kg A) 0.19 kg B) 0.0379 kg C) 0.0758 kg D) 0.151 kg E) 0.38 kg

Exam 3: Calculations With Chemical Formulas and Equations

An 8.925 g sample of a compound containing only carbon,hydrogen,and oxygen gives 9.258 g of carbon dioxide and 5.351 g of water after complete combustion of the sample in dioxygen.What is the mass percentage of hydrogen in the sample?

(Multiple Choice)

4.9/5

(34)

Question 41

A _____ is used to determine the molecular weight of a substance when its molecular formula is not known.

(Multiple Choice)

4.9/5

(35)

Question 42

An organic compound has a molecular mass of 324.2 amu and contains 66.63% carbon by mass.How many carbon atoms are in each molecule of this compound?

(Multiple Choice)

4.8/5

(37)

Question 43

Styrene's empirical formula is CH.What mass of styrene contains 2.95 × 10²¹ atoms of hydrogen? The molar mass of styrene is 104 g/mol.

(Multiple Choice)

4.9/5

(41)

Question 44

Elemental sulfur can be converted to sulfur dioxide by combustion in air.Sulfur dioxide will react with water to form sulfurous acid (see balanced equation below). SO₂(g)+ H₂O(l)→ H₂SO₃(l) What mass of sulfur dioxide is needed to prepare 29.36 g of H₂SO₃(l)?

(Multiple Choice)

4.8/5

(31)

Question 45

_____ is the calculation of the quantities of reactants and products involved in a chemical reaction.

(Multiple Choice)

4.9/5

(29)

Question 46

Monodisperse polyacrylonitrile contains molecules with the general formula -(CH₂CHCN)_n-,where n is typically greater than 10,000.Given that a sample of monodisperse polyacrylonitrile weighs 665.1 g and contains molecules of -(CH₂CHCN)_n-,what is the molar mass of the polymer?

(Multiple Choice)

4.9/5

(29)

Question 47

A sample containing only carbon,hydrogen,phosphorus,and oxygen is subjected to elemental analysis.After complete combustion,a 0.3584-g sample of the compound yields 0.5139 g of CO₂,0.3155 g of H₂O,and 0.2762 g of P₄O₁₀.What is the empirical formula of the compound?

(Multiple Choice)

4.8/5

(37)

Question 48

How many moles of iron atoms are contained in 4.16 g of iron?

(Multiple Choice)

4.9/5

(34)

Question 49

NaHCO₃ is the active ingredient in baking soda.How many grams of oxygen are present in 0.25 g of NaHCO₃?

(Multiple Choice)

4.8/5

(36)

Question 50

The total number of oxygen atoms in 1.93 g of CaCO₃ (MM = 100.0 g/mol)is

(Multiple Choice)

4.7/5

(33)

Question 51

A 3.903 g sample of a hydrocarbon is burned in an excess of dioxygen,producing 7.31177 g CO₂ and 4.488 g H₂O.What is the empirical formula of the hydrocarbon?

(Multiple Choice)

4.9/5

(38)

Question 52

A compound composed of only C and H contains 79.88 % C by mass.What is its empirical formula?

(Multiple Choice)

4.9/5

(31)

Question 53

The empirical formula of styrene is CH; its molar mass is 104.1 g/mol.What is the molecular formula of styrene?

(Multiple Choice)

4.9/5

(37)

Question 54

What is the mass of oxygen atoms in 0.380 mol Fe(CO)₅?

(Multiple Choice)

4.8/5

(37)

Question 55

Sulfur trioxide,SO₃,is made from the oxidation of SO₂,and the reaction is represented by the equation: 2SO₂ + O₂ → 2SO₃ A 25-g sample of SO₂ gives 18 g of SO₃.The percent yield of SO₃ is .

(Multiple Choice)

4.8/5

(32)

Question 56

The mineral leadhillite,which is essentially Pb₄(SO₄)(CO₃)₂(OH)₂ (FW = 1079 g/mol),contains ____% hydrogen by mass.

(Multiple Choice)

4.9/5

(30)

Question 57

A chemical reaction has the equation: 2A + B → C.Which of the following figures best illustrates a stoichiometric ratio of A and B? I. II. III. IV.

(Multiple Choice)

5.0/5

(26)

Question 58

Pure copper may be produced by the reaction of copper(I)sulfide with oxygen gas as follows: Cu₂S(s)+ O₂(g)→ 2Cu(s)+ SO₂(g) If 0.190 kg of copper(I)sulfide reacts with excess oxygen,what mass of copper metal may be produced?

(Multiple Choice)

4.8/5

(28)

Question 59

Which of the following compounds has the highest percentage of hydrogen atoms by mass?

(Multiple Choice)

4.9/5

(33)

Question 60

Showing 41 - 60 of 139

Exam 3: Calculations With Chemical Formulas and Equations

An 8.925 g sample of a compound containing only carbon,hydrogen,and oxygen gives 9.258 g of carbon dioxide and 5.351 g of water after complete combustion of the sample in dioxygen.What is the mass percentage of hydrogen in the sample?

A _____ is used to determine the molecular weight of a substance when its molecular formula is not known.

An organic compound has a molecular mass of 324.2 amu and contains 66.63% carbon by mass.How many carbon atoms are in each molecule of this compound?

Styrene's empirical formula is CH.What mass of styrene contains 2.95 × 1021 atoms of hydrogen? The molar mass of styrene is 104 g/mol.

Elemental sulfur can be converted to sulfur dioxide by combustion in air.Sulfur dioxide will react with water to form sulfurous acid (see balanced equation below). SO2(g)+ H2O(l)→ H2SO3(l) What mass of sulfur dioxide is needed to prepare 29.36 g of H2SO3(l)?

_____ is the calculation of the quantities of reactants and products involved in a chemical reaction.

Monodisperse polyacrylonitrile contains molecules with the general formula -(CH2CHCN)n-,where n is typically greater than 10,000.Given that a sample of monodisperse polyacrylonitrile weighs 665.1 g and contains molecules of -(CH2CHCN)n-,what is the molar mass of the polymer?

A sample containing only carbon,hydrogen,phosphorus,and oxygen is subjected to elemental analysis.After complete combustion,a 0.3584-g sample of the compound yields 0.5139 g of CO2,0.3155 g of H2O,and 0.2762 g of P4O10.What is the empirical formula of the compound?

How many moles of iron atoms are contained in 4.16 g of iron?

NaHCO3 is the active ingredient in baking soda.How many grams of oxygen are present in 0.25 g of NaHCO3?

The total number of oxygen atoms in 1.93 g of CaCO3 (MM = 100.0 g/mol)is

A 3.903 g sample of a hydrocarbon is burned in an excess of dioxygen,producing 7.31177 g CO2 and 4.488 g H2O.What is the empirical formula of the hydrocarbon?

A compound composed of only C and H contains 79.88 % C by mass.What is its empirical formula?

The empirical formula of styrene is CH; its molar mass is 104.1 g/mol.What is the molecular formula of styrene?

What is the mass of oxygen atoms in 0.380 mol Fe(CO)5?

Sulfur trioxide,SO3,is made from the oxidation of SO2,and the reaction is represented by the equation: 2SO2 + O2 → 2SO3 A 25-g sample of SO2 gives 18 g of SO3.The percent yield of SO3 is .

The mineral leadhillite,which is essentially Pb4(SO4)(CO3)2(OH)2 (FW = 1079 g/mol),contains ____% hydrogen by mass.

A chemical reaction has the equation: 2A + B → C.Which of the following figures best illustrates a stoichiometric ratio of A and B? I. II. III. IV.

Pure copper may be produced by the reaction of copper(I)sulfide with oxygen gas as follows: Cu2S(s)+ O2(g)→ 2Cu(s)+ SO2(g) If 0.190 kg of copper(I)sulfide reacts with excess oxygen,what mass of copper metal may be produced?

Which of the following compounds has the highest percentage of hydrogen atoms by mass?

Chemistry and Measurement

Atoms, molecules, and Ions

Chemical Reactions

The Gaseous State

Thermochemistry

Quantum Theory of the Atom

Electron Configurations and Periodicity

Ionic and Covalent Bonding

Molecular Geometry and Chemical Bonding Theory

States of Matter; Liquids and Solids

Solutions

Rates of Reaction

Chemical Equilibrium

Acids and Bases

Acid-Base Equilibria

Solubility and Complex-Ion Equilibria

Thermodynamics and Equilibrium

Electrochemistry

Nuclear Chemistry

Chemistry of the Main-Group Metals

The Transition Elements and Coordination Compounds

Organic Chemistry

Polymer Materials: Synthetic and Biological

Filters

Styrene's empirical formula is CH.What mass of styrene contains 2.95 × 10²¹ atoms of hydrogen? The molar mass of styrene is 104 g/mol.

Elemental sulfur can be converted to sulfur dioxide by combustion in air.Sulfur dioxide will react with water to form sulfurous acid (see balanced equation below). SO₂(g)+ H₂O(l)→ H₂SO₃(l) What mass of sulfur dioxide is needed to prepare 29.36 g of H₂SO₃(l)?

Monodisperse polyacrylonitrile contains molecules with the general formula -(CH₂CHCN)_n-,where n is typically greater than 10,000.Given that a sample of monodisperse polyacrylonitrile weighs 665.1 g and contains molecules of -(CH₂CHCN)_n-,what is the molar mass of the polymer?

A sample containing only carbon,hydrogen,phosphorus,and oxygen is subjected to elemental analysis.After complete combustion,a 0.3584-g sample of the compound yields 0.5139 g of CO₂,0.3155 g of H₂O,and 0.2762 g of P₄O₁₀.What is the empirical formula of the compound?

NaHCO₃ is the active ingredient in baking soda.How many grams of oxygen are present in 0.25 g of NaHCO₃?

The total number of oxygen atoms in 1.93 g of CaCO₃ (MM = 100.0 g/mol)is

A 3.903 g sample of a hydrocarbon is burned in an excess of dioxygen,producing 7.31177 g CO₂ and 4.488 g H₂O.What is the empirical formula of the hydrocarbon?

What is the mass of oxygen atoms in 0.380 mol Fe(CO)₅?

Sulfur trioxide,SO₃,is made from the oxidation of SO₂,and the reaction is represented by the equation: 2SO₂ + O₂ → 2SO₃ A 25-g sample of SO₂ gives 18 g of SO₃.The percent yield of SO₃ is .

The mineral leadhillite,which is essentially Pb₄(SO₄)(CO₃)₂(OH)₂ (FW = 1079 g/mol),contains ____% hydrogen by mass.

Pure copper may be produced by the reaction of copper(I)sulfide with oxygen gas as follows: Cu₂S(s)+ O₂(g)→ 2Cu(s)+ SO₂(g) If 0.190 kg of copper(I)sulfide reacts with excess oxygen,what mass of copper metal may be produced?