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 the reaction of 0.530 kg of copper(I)sulfide with excess oxygen produces 0.290 kg of copper metal,what is the percent yield?

A) 137 % B) 39.9 % C) 54.7 % D) 274 % E) 68.5 % A) 137 % B) 39.9 % C) 54.7 % D) 274 % E) 68.5 %

How many grams of potassium are present in 28.7 g of K2Cr2O7?

A) 7.63 g B) 1.468 g C) 3.81 g D) 78.2 g E) 14.4 g A) 7.63 g B) 1.468 g C) 3.81 g D) 78.2 g E) 14.4 g

The molecular formula of a particular solid is C8H4O6.Its molecular mass is

A) 288 amu. B) 100 amu. C) 296 amu. D) 196 amu. E) 170 amu. A) 288 amu. B) 100 amu. C) 296 amu. D) 196 amu. E) 170 amu.

What is the molar mass of the solid C6H8N2O4?

A) 144 g/mol B) 108 g/mol C) 172 g/mol D) 90 g/mol E) 164 g/mol A) 144 g/mol B) 108 g/mol C) 172 g/mol D) 90 g/mol E) 164 g/mol

Balance the following expression: __ CH3CH2COOH + __ O2 → __ CO2 + __ H2O How many moles of O2 are required for the complete combustion of 6 mol of propanoic acid?

A) 6 mol B) 33 mol C) 21 mol D) 38 mol E) 4 mol A) 6 mol B) 33 mol C) 21 mol D) 38 mol E) 4 mol

Plastic wrap can be made from poly(vinylidene chloride).A single poly(vinylidene chloride)strand has the general formula -(CH2CHCl)n-,where n ranges from 10,000 to 100,000.What is the molar mass of a single poly(vinylidene chloride)molecule containing repeating units?

A) g/mol B) g/mol C) g/mol D) g/mol E) g/mol A) g/mol B) g/mol C) g/mol D) g/mol E) g/mol

SO2 reacts with H2S as follows: 2H2S + SO2 → 3S + 2H2O When 7.50 g of H2S reacts with 12.75 g of SO2,which statement applies?

A) 6.38 g of sulfur is formed. B) SO2 is the limiting reagent. C) 0.0216 mol of H2S remains. D) 10.6 g of sulfur is formed. E) 1.13 g of H2S remains. A) 6.38 g of sulfur is formed. B) SO2 is the limiting reagent. C) 0.0216 mol of H2S remains. D) 10.6 g of sulfur is formed. E) 1.13 g of H2S remains.

Consider the fermentation reaction of glucose: C6H12O6 → 2C2H5OH + 2CO2 A 1)00-mol sample of C6H12O6 was placed in a vat with 100 g of yeast.If 67.7 g of C2H5OH was obtained,what was the percent yield of C2H5OH?

A) 73.5 % B) 36.7 % C) 67.7 % D) 100 % E) none of these A) 73.5 % B) 36.7 % C) 67.7 % D) 100 % E) none of these

The commercial production of phosphoric acid,H3PO4,can be represented by the equation 1580 g 296 g 317 g 1030 g 296 g Ca3(PO4)2 + 3SiO2 + 5C + 5O2 + 3H2O → 3CaSiO3 + 5CO2 + 2H3PO4 310 g/mol 60)1 g/mol 12)0 g/mol 32)0 g/mol 18)0 g/mol The molar mass for each reactant is shown below the reactant,and the mass of each reactant for this problem is given above.Which substance is the limiting reactant?

A) H2O B) C C) O2 D) Ca3(PO4)2 E) SiO2 A) H2O B) C C) O2 D) Ca3(PO4)2 E) SiO2

A sample of 96 g of ozone,O3,contains the same number of atoms as

A) 96 g of oxygen (O2). B) 8.06 g of hydrogen (H2). C) 76 g of fluorine (F2). D) 54 g of aluminum (Al). E) 117 g of nickel (Ni). A) 96 g of oxygen (O2). B) 8.06 g of hydrogen (H2). C) 76 g of fluorine (F2). D) 54 g of aluminum (Al). E) 117 g of nickel (Ni).

A sample containing 0.400 mol of a compound is composed of 2.41 × 1023 atoms of sodium,14.19 g of chlorine atoms,and 19.22 g of oxygen atoms.The formula of the compound is

A) NaClO3. B) NaClO5. C) NaClO. D) NaClO4. E) NaClO2. A) NaClO3. B) NaClO5. C) NaClO. D) NaClO4. E) NaClO2.

Which is a reasonable mass corresponding to 1026 molecules of a substance?

A) 100 ng B) 100 g C) 100 mg D) 100 kg E) 100 µg A) 100 ng B) 100 g C) 100 mg D) 100 kg E) 100 µg

Exam 3: Calculations With Chemical Formulas and Equations

A hydrocarbon,subjected to elemental analysis,was found to contain 79.89 % carbon and 20.11 % hydrogen by mass.What is the empirical formula of the hydrocarbon?

(Multiple Choice)

4.8/5

(32)

Question 121

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 the reaction of 0.530 kg of copper(I)sulfide with excess oxygen produces 0.290 kg of copper metal,what is the percent yield?

(Multiple Choice)

4.9/5

(36)

Question 122

A given hydrocarbon is burned in the presence of oxygen gas and is converted completely to water and carbon dioxide.The mole ratio of H₂O to CO₂ is 1.125:1.00.The hydrocarbon could be

(Multiple Choice)

4.9/5

(40)

Question 123

How many grams of potassium are present in 28.7 g of K₂Cr₂O₇?

(Multiple Choice)

4.8/5

(34)

Question 124

A chemical reaction has the equation: 2A + B → C.In which case is B the limiting reactant?

(Multiple Choice)

4.7/5

(36)

Question 125

The molecular formula of a particular solid is C₈H₄O₆.Its molecular mass is

(Multiple Choice)

4.8/5

(23)

Question 126

What is the molar mass of the solid C₆H₈N₂O₄?

(Multiple Choice)

4.8/5

(29)

Question 127

Balance the following expression: CH₃CH₂COOH + O₂ → CO₂ + H₂O How many moles of O₂ are required for the complete combustion of 6 mol of propanoic acid?

(Multiple Choice)

4.8/5

(32)

Question 128

Plastic wrap can be made from poly(vinylidene chloride).A single poly(vinylidene chloride)strand has the general formula -(CH₂CHCl)_n-,where n ranges from 10,000 to 100,000.What is the molar mass of a single poly(vinylidene chloride)molecule containing repeating units?

(Multiple Choice)

4.9/5

(44)

Question 129

SO₂ reacts with H₂S as follows: 2H₂S + SO₂ → 3S + 2H₂O When 7.50 g of H₂S reacts with 12.75 g of SO₂,which statement applies?

(Multiple Choice)

4.9/5

(33)

Question 130

Consider the fermentation reaction of glucose: C₆H₁₂O₆ → 2C₂H₅OH + 2CO₂ A 1)00-mol sample of C₆H₁₂O₆ was placed in a vat with 100 g of yeast.If 67.7 g of C₂H₅OH was obtained,what was the percent yield of C₂H₅OH?

(Multiple Choice)

4.8/5

(37)

Question 131

A 3.391 g sample of a compound containing only carbon,hydrogen,and oxygen is burned in an excess of dioxygen,producing 6.477 g CO₂ and 3.978 g H₂O.What mass of oxygen is contained in the original sample?

(Multiple Choice)

4.9/5

(37)

Question 132

Which one of the following samples has the greatest mass?

(Multiple Choice)

4.9/5

(39)

Question 133

A compound is composed of only C and H.It contains 92.26 % C.What is its empirical formula?

(Multiple Choice)

4.7/5

(39)

Question 134

The commercial production of phosphoric acid,H₃PO₄,can be represented by the equation 1580 g 296 g 317 g 1030 g 296 g Ca₃(PO₄)₂ + 3SiO₂ + 5C + 5O₂ + 3H₂O → 3CaSiO₃ + 5CO₂ + 2H₃PO₄ 310 g/mol 60)1 g/mol 12)0 g/mol 32)0 g/mol 18)0 g/mol The molar mass for each reactant is shown below the reactant,and the mass of each reactant for this problem is given above.Which substance is the limiting reactant?

(Multiple Choice)

4.8/5

(40)

Question 135

A sample of 96 g of ozone,O₃,contains the same number of atoms as

(Multiple Choice)

4.7/5

(40)

Question 136

A sample containing 0.400 mol of a compound is composed of 2.41 × 10²³ atoms of sodium,14.19 g of chlorine atoms,and 19.22 g of oxygen atoms.The formula of the compound is

(Multiple Choice)

4.9/5

(36)

Question 137

What is the mass percentage of carbon in the compound C₆H₆O₃?

(Multiple Choice)

4.8/5

(31)

Question 138

Which is a reasonable mass corresponding to 10²⁶ molecules of a substance?

(Multiple Choice)

4.9/5

(38)

Question 139

Showing 121 - 139 of 139

Exam 3: Calculations With Chemical Formulas and Equations

A hydrocarbon,subjected to elemental analysis,was found to contain 79.89 % carbon and 20.11 % hydrogen by mass.What is the empirical formula of the hydrocarbon?

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 the reaction of 0.530 kg of copper(I)sulfide with excess oxygen produces 0.290 kg of copper metal,what is the percent yield?

A given hydrocarbon is burned in the presence of oxygen gas and is converted completely to water and carbon dioxide.The mole ratio of H2O to CO2 is 1.125:1.00.The hydrocarbon could be

How many grams of potassium are present in 28.7 g of K2Cr2O7?

A chemical reaction has the equation: 2A + B → C.In which case is B the limiting reactant?

The molecular formula of a particular solid is C8H4O6.Its molecular mass is

What is the molar mass of the solid C6H8N2O4?

Balance the following expression: __ CH3CH2COOH + __ O2 → __ CO2 + __ H2O How many moles of O2 are required for the complete combustion of 6 mol of propanoic acid?

Plastic wrap can be made from poly(vinylidene chloride).A single poly(vinylidene chloride)strand has the general formula -(CH2CHCl)n-,where n ranges from 10,000 to 100,000.What is the molar mass of a single poly(vinylidene chloride)molecule containing repeating units?

SO2 reacts with H2S as follows: 2H2S + SO2 → 3S + 2H2O When 7.50 g of H2S reacts with 12.75 g of SO2,which statement applies?

Consider the fermentation reaction of glucose: C6H12O6 → 2C2H5OH + 2CO2 A 1)00-mol sample of C6H12O6 was placed in a vat with 100 g of yeast.If 67.7 g of C2H5OH was obtained,what was the percent yield of C2H5OH?

A 3.391 g sample of a compound containing only carbon,hydrogen,and oxygen is burned in an excess of dioxygen,producing 6.477 g CO2 and 3.978 g H2O.What mass of oxygen is contained in the original sample?

Which one of the following samples has the greatest mass?

A compound is composed of only C and H.It contains 92.26 % C.What is its empirical formula?

A sample of 96 g of ozone,O3,contains the same number of atoms as

A sample containing 0.400 mol of a compound is composed of 2.41 × 1023 atoms of sodium,14.19 g of chlorine atoms,and 19.22 g of oxygen atoms.The formula of the compound is

What is the mass percentage of carbon in the compound C6H6O3?

Which is a reasonable mass corresponding to 1026 molecules of a substance?

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

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 the reaction of 0.530 kg of copper(I)sulfide with excess oxygen produces 0.290 kg of copper metal,what is the percent yield?

A given hydrocarbon is burned in the presence of oxygen gas and is converted completely to water and carbon dioxide.The mole ratio of H₂O to CO₂ is 1.125:1.00.The hydrocarbon could be

How many grams of potassium are present in 28.7 g of K₂Cr₂O₇?

The molecular formula of a particular solid is C₈H₄O₆.Its molecular mass is

What is the molar mass of the solid C₆H₈N₂O₄?

Balance the following expression: CH₃CH₂COOH + O₂ → CO₂ + H₂O How many moles of O₂ are required for the complete combustion of 6 mol of propanoic acid?

Plastic wrap can be made from poly(vinylidene chloride).A single poly(vinylidene chloride)strand has the general formula -(CH₂CHCl)_n-,where n ranges from 10,000 to 100,000.What is the molar mass of a single poly(vinylidene chloride)molecule containing repeating units?

SO₂ reacts with H₂S as follows: 2H₂S + SO₂ → 3S + 2H₂O When 7.50 g of H₂S reacts with 12.75 g of SO₂,which statement applies?

Consider the fermentation reaction of glucose: C₆H₁₂O₆ → 2C₂H₅OH + 2CO₂ A 1)00-mol sample of C₆H₁₂O₆ was placed in a vat with 100 g of yeast.If 67.7 g of C₂H₅OH was obtained,what was the percent yield of C₂H₅OH?

A 3.391 g sample of a compound containing only carbon,hydrogen,and oxygen is burned in an excess of dioxygen,producing 6.477 g CO₂ and 3.978 g H₂O.What mass of oxygen is contained in the original sample?

A sample of 96 g of ozone,O₃,contains the same number of atoms as

A sample containing 0.400 mol of a compound is composed of 2.41 × 10²³ atoms of sodium,14.19 g of chlorine atoms,and 19.22 g of oxygen atoms.The formula of the compound is

What is the mass percentage of carbon in the compound C₆H₆O₃?

Which is a reasonable mass corresponding to 10²⁶ molecules of a substance?