ACS General Chemistry Stoichiometry 40 Questions And Answers
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What is the empirical formula for the substance with this analysis?
Elemental Analysis by Mass
Na 54.0%
B 8.50%
0 37.5%
(A) Na₃BO₃
(B) Na₂B₂O₃
(C) Na₄BO₄
(D) Na₃B₂O₂
Elemental Analysis by Mass
Na 54.0%
B 8.50%
0 37.5%
(A) Na₃BO₃
(B) Na₂B₂O₃
(C) Na₄BO₄
(D) Na₃B₂O₂
(A) Na₃BO₃
What is the mass percent of oxygen in Fe₂(S0₄)₃?
Atomic Molar Mass Data
Fe 55.85 g•mo1⁻¹
S 32.06 g•mo1⁻¹
O 16.00 g•mo1⁻¹
(A) 15.40% (B) 18.76% (C) 30.80% (D) 48.01%
Atomic Molar Mass Data
Fe 55.85 g•mo1⁻¹
S 32.06 g•mo1⁻¹
O 16.00 g•mo1⁻¹
(A) 15.40% (B) 18.76% (C) 30.80% (D) 48.01%
(D) 48.01%
A typical silicon chip, such as those in electronic calculators, has a mass of 2.3 x 10⁻⁴g. Assuming the chip is pure silicon, how many silicon atoms are in such a chip?
(A) 4.9 X 10¹⁸
(B) 1.4 X 10²⁰
(C) 3.9 X 10²¹
(D) 2.6 X 10²⁷
(A) 4.9 X 10¹⁸
(B) 1.4 X 10²⁰
(C) 3.9 X 10²¹
(D) 2.6 X 10²⁷
(A) 4.9 X 10¹⁸
A hydrocarbon with general formula CxHy was burned completely in air, yielding 0.18g of water and 0.44 g of carbon dioxide. Which formula could give such data?
Formula Molar Mass
H₂0 18.0 g•mo1⁻¹
C0₂ 44.0 g•mo1⁻¹
(A) C₂H₂ (B) C₂H₄ (C) C₂H₆ (D)C₆H₆
Formula Molar Mass
H₂0 18.0 g•mo1⁻¹
C0₂ 44.0 g•mo1⁻¹
(A) C₂H₂ (B) C₂H₄ (C) C₂H₆ (D)C₆H₆
(B) C₂H₄
Calculate the mass of SbF₃ needed to produce 1.00 g of Freon-12, CCl₂F₂. The reaction is represented by this equation.
3CCl₄+ 2SbF₃ → 3CCl₂F₂ + 2SbC1₃
Formula Molar Mass
SbF₃ 179 g•mo1⁻¹
CC1₂F₂ 121 g•mo1⁻¹
(A) 0.667 g (B) 0.986 g (C) 1.48 g (D) 2.22 g
3CCl₄+ 2SbF₃ → 3CCl₂F₂ + 2SbC1₃
Formula Molar Mass
SbF₃ 179 g•mo1⁻¹
CC1₂F₂ 121 g•mo1⁻¹
(A) 0.667 g (B) 0.986 g (C) 1.48 g (D) 2.22 g
(B) 0.986 g
What volume of 0.100 M SO₃²(aq) is needed to titrate 24.0 mL of 0.200 M Fe³⁺(aq)? This equation represents the reaction that takes place during the titration.
2Fe³⁺(aq) +SO₃²⁻(aq) +H₂0(L)→2Fe²⁺(aq)
+SO₄²⁻(aq) + 2H⁺(aq)
(A) 48.0 mL (B) 24.0 mL (C) 12.0 mL (D) 6.00 mL
2Fe³⁺(aq) +SO₃²⁻(aq) +H₂0(L)→2Fe²⁺(aq)
+SO₄²⁻(aq) + 2H⁺(aq)
(A) 48.0 mL (B) 24.0 mL (C) 12.0 mL (D) 6.00 mL
(B) 24.0 mL
If a 17.0 g sample of impure, nickel metal reacts with excess carbon monoxide, CO, fotming 6.25 L of Ni(C0)₄ gas under standard temperature and pressure conditions, what is the percent by mass of nickel in the impure nickel metal sample?
Ni(s) -:- 4CO(g) →Ni(CO)₄(g)
(A) 24.1% (B) 25.0% (C) 96.3% (D) 100%
Ni(s) -:- 4CO(g) →Ni(CO)₄(g)
(A) 24.1% (B) 25.0% (C) 96.3% (D) 100%
(C) 96.3%
The combustion reaction of C₃H₈0 with 0₂ is represented by this balanced chemical equation.
F'ormula Molar Mass
C₃H₈0 60.l g•mo1⁻¹
O₂ 32.0 g•mo1⁻¹
When 3.00 g C₃H₈0 and 7.38 g 0₂ are combined, how many moles of which reagent remain?
(A) 0.006 mo1 0₂
(B) 0.24 mol C₃H₈O
(C) 0.24 mol O₂
(D) 0.18 mol C₃H₈0
F'ormula Molar Mass
C₃H₈0 60.l g•mo1⁻¹
O₂ 32.0 g•mo1⁻¹
When 3.00 g C₃H₈0 and 7.38 g 0₂ are combined, how many moles of which reagent remain?
(A) 0.006 mo1 0₂
(B) 0.24 mol C₃H₈O
(C) 0.24 mol O₂
(D) 0.18 mol C₃H₈0
(A) 0.006 mo1 0₂
What is the maximum mass of (NH₄)₂S0₄ that could be formed from 17 kg of NH₃ and 200 kg of solution containing 49% H₂S0₄ by mass? This equation represents the reaction.
2NH₃(g) + H₂SO₄(aq)→(NH₄)₂SO₄(s)
(A) 217 kg (B) 132 kg (C)115 kg (D) 66 kg
2NH₃(g) + H₂SO₄(aq)→(NH₄)₂SO₄(s)
(A) 217 kg (B) 132 kg (C)115 kg (D) 66 kg
(D) 66 kg
What is the percent yield of PbI₂ if 5.00 g of Pbl₂ results from a solution containing 10.0 g of Pb(C₂H₃0₂)₂ with a solution containing an excess. of KI? This is the equation representing the reaction.
Pb(C₂H₃0₂)₂(aq) + 2Kl(aq)→PbI₂(s)
+2KC₂H₃0₂(aq)
(A) 17.6% (B) 35.3% (C) 50.0% (D) 70.5%
Pb(C₂H₃0₂)₂(aq) + 2Kl(aq)→PbI₂(s)
+2KC₂H₃0₂(aq)
(A) 17.6% (B) 35.3% (C) 50.0% (D) 70.5%
(B) 35.3%