AP QUIZZES - AP TOPIC 4 Stoichiometry SET B
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QUESTION 1. A 54.9 g sample of a hydrocarbon undergoes combustion to produce 38.0 g of water. What is the percentage of hydrogen in the hydrocarbon?

(A) 2.11 %
(B) 4.22 %
(C) 54.9 %
(D) 73.1 %
(E) 7.69 %

QUESTION 2. In the reaction below, 9.23 moles of Carbon dioxide are formed from 10.2 moles of the hydrocarbon. What is the percentage yield?

2C4H10 + 13O2 ==> 8CO2 + 10H2O


(A) 22.6 %
(B) 9.23 %
(C) 40.8 %
(D) 90.5 %
(E) None of the Above

QUESTION 3. Two moles of a particular group I bromide have a mass of 206 g. Identify the group I metal.

(A) Li
(B) Na
(C) K
(D) Rb
(E) Cs

QUESTION 4. What is the molality of an aqueous solution of a compound with a molar mass of 120. g/mol that has a density of 1.56 g/mL and a molarity of 5.78 M?

(A) 6.67 m
(B) 5.78 m
(C) 120. m
(D) 1.56 m
(E) None of the Above

QUESTION 5. What is the % by mass of Beryllium Chloride?

(A) 50% Be, 50% Cl
(B) 33% Be, 67% Cl
(C) 25% Be, 75% Cl
(D) 11.25% Be, 88.75% Cl
(E) 10.1% Be, 89.9% Cl




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