REGULAR QUIZZES - REGULAR TOPIC 7 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. Which of the following contains the greatest number of molecules?

(A) 3.00 moles of Carbon dioxide
(B) 2.00 moles of Carbon dioxide
(C) 2.00 moles of Sulfuric acid
(D) 88.0 grams of Carbon dioxide
(E) 98.0 grams of Sulfuric acid

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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