Question 1

Consider the balanced equation: Al2S3(s) + 6H2O(l) $\rightarrow$2Al(OH)3(s) + 3H2S(g)
If 15.0 g of aluminum sulfide and 10.0 g of water are allowed to react as above, and assuming a complete reaction
A) by calculation, find out which is the limiting reagent.
B) calculate the maximum mass of H2S which can be formed from these reagents.
C) calculate the mass of excess reagent remaining after the reaction is complete.

Accepted Answer

a. Water is the limi...

Question 2

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?

Accepted Answer

A)   C2H3O4
B)   C3H4O2
C)   C4H3O2
D)   C5H12O4
E)   C2H2OF) All of the above
G) C) and D)

Question 3

Sodium bromate is used in a mixture which dissolves gold from its ores. Calculate the mass in grams of 4.68 mol of sodium bromate.

Accepted Answer

A)   706 g
B)   482 g
C)   383 g
D)   32.2 g
E)   0.0310 gF) B) and C)
G) D) and E)

Question 4

Lithium hydroxide is used in alkaline batteries. Calculate the molarity of a solution prepared by dissolving 1.495 moles of LiOH in enough water to give a final volume of 750. mL.

Accepted Answer

A)   1.99 M
B)   1.50 M
C)   1.12 M
D)   0.502 M
E)   0.00199 MF) All of the above
G) B) and E)

Question 5

How many protons are there in a molecule of adrenaline (C9H13NO3) , a neurotransmitter and hormone?

Accepted Answer

A)   22
B)   26
C)   43
D)   98
E)   183F) B) and D)
G) All of the above

Question 6

Calculate the molar mass of Ca(BO2) 2·6H2O.

Accepted Answer

A)   273.87 g/mol
B)   233.79 g/mol
C)   183.79 g/mol
D)   174.89 g/mol
E)   143.71 g/molF) B) and E)
G) None of the above

Question 7

Aluminum metal reacts with chlorine gas to form solid aluminum trichloride, AlCl3. What mass of chlorine gas is needed to react completely with 163 g of aluminum?

Accepted Answer

A)   214 g
B)   245 g
C)   321 g
D)   489 g
E)   643 gF) D) and E)
G) C) and D)

Question 8

Sodium hydroxide, also known as caustic soda, is used to neutralize acids and to treat cellulose in making of cellophane. Calculate the number of moles of solute in 1.875 L of 1.356 M NaOH solution.

Accepted Answer

A)   2.543 mol
B)   1.383 mol
C)   0.7232 mol
D)   0.3932 mol
E)   0.001383 molF) C) and D)
G) A) and C)

Question 9

Aluminum oxide (used as an adsorbent or a catalyst for organic reactions)  forms when aluminum reacts with oxygen. 
4Al(s)  + 3O2(g)   →\rightarrow→ 2Al2O3(s) 
A mixture of 82.49 g of aluminum (? = 26.98 g/mol)  and 117.65 g of oxygen (? = 32.00 g/mol)  is allowed to react. What mass of aluminum oxide (? = 101.96 g/mol)  can be formed?

Accepted Answer

A)   155.8 g
B)   200.2 g
C)   249.9 g
D)   311.7 g
E)   374.9 g F) A) and D)
G) C) and D)

Question 10

Calculate the number of moles in 17.8 g of the antacid magnesium hydroxide, Mg(OH) 2.

Accepted Answer

A)   3.28 mol
B)   2.32 mol
C)   0.431 mol
D)   0.305 mol
E)   0.200 molF) All of the above
G) A) and B)

Question 11

Balance the following equation for the combustion of benzene: C6H6(l)  + O2(g)  →\rightarrow→ H2O(g)  + CO2(g)

Accepted Answer

A)   C6H6(l)  + 9O2(g)   →\rightarrow→  3H2O(g)  + 6CO2(g) 
B)   C6H6(l)  + 9O2(g)   →\rightarrow→ 6H2O(g)  + 6CO2(g) 
C)   2C6H6(l)  + 15O2(g)   →\rightarrow→ 6H2O(g)  + 12CO2(g) 
D)   C6H6(l)  + 15O2(g)   →\rightarrow→ 3H2O(g)  + 6CO2(g) 
E)   2C6H6(l)  + 9O2(g)   →\rightarrow→ 6H2O(g)  + 12CO2(g)  F) A) and E)
G) C) and E)

Question 12

Constitutional (structural) isomers have the same molecular formula but different structural formulas.

Accepted Answer

A) True 
 B)False

Question 13

Constitutional (structural) isomers have the same empirical formula but different molecular formulas.

Accepted Answer

A) True 
 B)False

Question 14

Balance the following equation: C8H18O3(l)  + O2(g)   →\rightarrow→  H2O(g)  + CO2(g)

Accepted Answer

A)   C8H18O3(l)  + 8O2(g)   →\rightarrow→  9H2O(g)  + 8CO2(g) 
B)   C8H18O3(l)  + 11O2(g)   →\rightarrow→  9H2O(g)  + 8CO2(g) 
C)   2C8H18O3(l)  + 22O2(g)   →\rightarrow→  9H2O(g)  + 16CO2(g) 
D)   C8H18O3(l)  + 13O2(g)   →\rightarrow→ 18H2O(g)  + 8CO2(g) 
E)   2C8H18O3(l)  + 17O2(g)   →\rightarrow→  18H2O(g)  + 16CO2(g)  F) A) and E)
G) None of the above

Question 15

Balance the following equation: B2O3(s)  + HF(l)   →\rightarrow→ BF3(g)  + H2O(l)

Accepted Answer

A)   B2O3(s)  + 6HF(l)   →\rightarrow→  2BF3(g)  + 3H2O(l) 
B)   B2O3(s)  + H6F6(l)   →\rightarrow→ B2F6(g)  + H6O3(l) 
C)   B2O3(s)  + 2HF(l)   →\rightarrow→  2BF3(g)  + H2O(l) 
D)   B2O3(s)  + 3HF(l)   →\rightarrow→  2BF3(g)  + 3H2O(l) 
E)   B2O3(s)  + 6HF(l)   →\rightarrow→  2BF3(g)  + 6H2O(l)  F) A) and E)
G) C) and D)

Question 16

Calculate the number of oxygen atoms in 29.34 g of sodium sulfate, Na2SO4.

Accepted Answer

A)   1.244 * 1023 O atoms
B)   4.976 * 1023 O atoms
C)   2.409 *1024 O atoms
D)   2.915 * 1024 O atoms
E)   1.166 * 1025 O atomsF) D) and E)
G) All of the above

Question 17

Phosphine, an extremely poisonous and highly reactive gas, will react with oxygen to form tetraphosphorus decaoxide and water. 
PH3(g)  + O2(g)   →\rightarrow→ P4O10(s)  + H2O(g)  [unbalanced]
Calculate the mass of P4O10(s)  formed when 225 g of PH3 reacts with excess oxygen.

Accepted Answer

A)   1880 g
B)   940. g
C)   900. g
D)   470 g
E)   56.3 g F) B) and D)
G) A) and B)

Question 18

How many mL of concentrated nitric acid (HNO3, 16.0 M)  should be diluted with water in order to make 2.00 L of 2.00 M solution?

Accepted Answer

A)   32.0 mL
B)   62.5 mL
C)   125 mL
D)   250. mL
E)   500. mLF) C) and E)
G) None of the above

Question 19

The correct method for preparing one liter of a 1.0 M solution of X is to dissolve exactly one mole of X in exactly one liter of water.

Accepted Answer

A) True 
 B)False

Question 20

Copper(II)  sulfide, CuS, is used in the development of aniline black dye in textile printing. What is the maximum mass of CuS which can be formed when 38.0 mL of 0.500 M CuCl2 are mixed with 42.0 mL of 0.600 M (NH4) 2S? Aqueous ammonium chloride is the other product.

Accepted Answer

A)   2.41 g
B)   1.82 g
C)   1.21 g
D)   0.909 g
E)   0.044 gF) B) and C)
G) A) and E)

Exam 3: Stoichiometry of Formulas and Equations

How many protons are there in a molecule of adrenaline (C₉H₁₃NO₃) , a neurotransmitter and hormone?

Correct Answer
verified

Phosphine, an extremely poisonous and highly reactive gas, will react with oxygen to form tetraphosphorus decaoxide and water. PH₃(g) + O₂(g) $\rightarrow$ P₄O₁₀(s) + H₂O(g) [unbalanced] Calculate the mass of P₄O₁₀(s) formed when 225 g of PH₃ reacts with excess oxygen.

Correct Answer
verified

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?

Correct Answer
verified

Calculate the molar mass of Ca(BO₂) ₂·6H₂O.

Correct Answer
verified

Constitutional (structural) isomers have the same molecular formula but different structural formulas.

Correct Answer
verified

Constitutional (structural) isomers have the same empirical formula but different molecular formulas.

Correct Answer
verified

Sodium hydroxide, also known as caustic soda, is used to neutralize acids and to treat cellulose in making of cellophane. Calculate the number of moles of solute in 1.875 L of 1.356 M NaOH solution.

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
a. Water is the limi...
View Answer

Copper(II) sulfide, CuS, is used in the development of aniline black dye in textile printing. What is the maximum mass of CuS which can be formed when 38.0 mL of 0.500 M CuCl₂ are mixed with 42.0 mL of 0.600 M (NH₄) ₂S? Aqueous ammonium chloride is the other product.

Correct Answer
verified

Aluminum metal reacts with chlorine gas to form solid aluminum trichloride, AlCl₃. What mass of chlorine gas is needed to react completely with 163 g of aluminum?

Correct Answer
verified

Lithium hydroxide is used in alkaline batteries. Calculate the molarity of a solution prepared by dissolving 1.495 moles of LiOH in enough water to give a final volume of 750. mL.

Correct Answer
verified

Balance the following equation: C₈H₁₈O₃(l) + O₂(g) $\rightarrow$ H₂O(g) + CO₂(g)

Correct Answer
verified

Calculate the number of moles in 17.8 g of the antacid magnesium hydroxide, Mg(OH) ₂.

Correct Answer
verified

Balance the following equation: B₂O₃(s) + HF(l) $\rightarrow$ BF₃(g) + H₂O(l)

Correct Answer
verified

Calculate the number of oxygen atoms in 29.34 g of sodium sulfate, Na₂SO₄.

Correct Answer
verified

Balance the following equation for the combustion of benzene: C₆H₆(l) + O₂(g) $\rightarrow$ H₂O(g) + CO₂(g)

Correct Answer
verified

How many mL of concentrated nitric acid (HNO₃, 16.0 M) should be diluted with water in order to make 2.00 L of 2.00 M solution?

Correct Answer
verified

The correct method for preparing one liter of a 1.0 M solution of X is to dissolve exactly one mole of X in exactly one liter of water.

Correct Answer
verified

Sodium bromate is used in a mixture which dissolves gold from its ores. Calculate the mass in grams of 4.68 mol of sodium bromate.

Correct Answer
verified

Exam 3: Stoichiometry of Formulas and Equations

How many protons are there in a molecule of adrenaline (C9H13NO3) , a neurotransmitter and hormone?

Correct AnswerverifiedShow Answer

Phosphine, an extremely poisonous and highly reactive gas, will react with oxygen to form tetraphosphorus decaoxide and water. PH3(g) + O2(g) →\rightarrow→ P4O10(s) + H2O(g) [unbalanced] Calculate the mass of P4O10(s) formed when 225 g of PH3 reacts with excess oxygen.

Correct AnswerverifiedShow Answer

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?

Correct AnswerverifiedShow Answer

Calculate the molar mass of Ca(BO2) 2·6H2O.

Correct AnswerverifiedShow Answer

Constitutional (structural) isomers have the same molecular formula but different structural formulas.

Correct AnswerverifiedShow Answer

Constitutional (structural) isomers have the same empirical formula but different molecular formulas.

Correct AnswerverifiedShow Answer

Sodium hydroxide, also known as caustic soda, is used to neutralize acids and to treat cellulose in making of cellophane. Calculate the number of moles of solute in 1.875 L of 1.356 M NaOH solution.

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Correct Answerverifieda. Water is the limi...View AnswerShow Answer

Copper(II) sulfide, CuS, is used in the development of aniline black dye in textile printing. What is the maximum mass of CuS which can be formed when 38.0 mL of 0.500 M CuCl2 are mixed with 42.0 mL of 0.600 M (NH4) 2S? Aqueous ammonium chloride is the other product.

Correct AnswerverifiedShow Answer

Aluminum metal reacts with chlorine gas to form solid aluminum trichloride, AlCl3. What mass of chlorine gas is needed to react completely with 163 g of aluminum?

Correct AnswerverifiedShow Answer

Lithium hydroxide is used in alkaline batteries. Calculate the molarity of a solution prepared by dissolving 1.495 moles of LiOH in enough water to give a final volume of 750. mL.

Correct AnswerverifiedShow Answer

Balance the following equation: C8H18O3(l) + O2(g) →\rightarrow→ H2O(g) + CO2(g)

Correct AnswerverifiedShow Answer

Calculate the number of moles in 17.8 g of the antacid magnesium hydroxide, Mg(OH) 2.

Correct AnswerverifiedShow Answer

Balance the following equation: B2O3(s) + HF(l) →\rightarrow→ BF3(g) + H2O(l)

Correct AnswerverifiedShow Answer

Calculate the number of oxygen atoms in 29.34 g of sodium sulfate, Na2SO4.

Correct AnswerverifiedShow Answer

Balance the following equation for the combustion of benzene: C6H6(l) + O2(g) →\rightarrow→ H2O(g) + CO2(g)

Correct AnswerverifiedShow Answer

How many mL of concentrated nitric acid (HNO3, 16.0 M) should be diluted with water in order to make 2.00 L of 2.00 M solution?

Correct AnswerverifiedShow Answer

The correct method for preparing one liter of a 1.0 M solution of X is to dissolve exactly one mole of X in exactly one liter of water.

Correct AnswerverifiedShow Answer

Sodium bromate is used in a mixture which dissolves gold from its ores. Calculate the mass in grams of 4.68 mol of sodium bromate.

Correct AnswerverifiedShow Answer

How many protons are there in a molecule of adrenaline (C₉H₁₃NO₃) , a neurotransmitter and hormone?

Correct Answer
verified

Phosphine, an extremely poisonous and highly reactive gas, will react with oxygen to form tetraphosphorus decaoxide and water. PH₃(g) + O₂(g) $\rightarrow$ P₄O₁₀(s) + H₂O(g) [unbalanced] Calculate the mass of P₄O₁₀(s) formed when 225 g of PH₃ reacts with excess oxygen.

Correct Answer
verified

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?

Correct Answer
verified

Calculate the molar mass of Ca(BO₂) ₂·6H₂O.

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
a. Water is the limi...
View Answer

Copper(II) sulfide, CuS, is used in the development of aniline black dye in textile printing. What is the maximum mass of CuS which can be formed when 38.0 mL of 0.500 M CuCl₂ are mixed with 42.0 mL of 0.600 M (NH₄) ₂S? Aqueous ammonium chloride is the other product.

Correct Answer
verified

Aluminum metal reacts with chlorine gas to form solid aluminum trichloride, AlCl₃. What mass of chlorine gas is needed to react completely with 163 g of aluminum?

Correct Answer
verified

Correct Answer
verified

Balance the following equation: C₈H₁₈O₃(l) + O₂(g) $\rightarrow$ H₂O(g) + CO₂(g)

Correct Answer
verified

Calculate the number of moles in 17.8 g of the antacid magnesium hydroxide, Mg(OH) ₂.

Correct Answer
verified

Balance the following equation: B₂O₃(s) + HF(l) $\rightarrow$ BF₃(g) + H₂O(l)

Correct Answer
verified

Calculate the number of oxygen atoms in 29.34 g of sodium sulfate, Na₂SO₄.

Correct Answer
verified

Balance the following equation for the combustion of benzene: C₆H₆(l) + O₂(g) $\rightarrow$ H₂O(g) + CO₂(g)

Correct Answer
verified

How many mL of concentrated nitric acid (HNO₃, 16.0 M) should be diluted with water in order to make 2.00 L of 2.00 M solution?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified