Waec Model Questions Vol1 2018 Chemistry Question 3

Practice objective / multiple choice question 3 from the 2018 Waec Model Questions Vol1 Chemistry examination.

Waec Model Questions Vol1 2018 Chemistry Objective / Multiple Choice Medium Difficulty
Question 3 WAEC_MODEL_QUESTIONS_VOL1 • 2018 • CHEMISTRY • objective

2.00 g of a compound A (molar mass = 60 g·mol⁻¹) reacts with excess of compound B according to the equation: 2 A + 3 B → C + 4 D. The reaction produces 1.20 L of gaseous product D measured at STP. Calculate the theoretical mass of D (in grams) that should be obtained and the percent yield of the reaction. (Assume D is N₂, M(D) = 28 g·mol⁻¹.)

Answer Options

Correct Answer A. Theoretical mass = 1.87 g; percent yield = 80.4%
B. Theoretical mass = 1.50 g; percent yield = 92.0%
C. Theoretical mass = 1.87 g; percent yield = 70.0%
D. Theoretical mass = 2.10 g; percent yield = 68.0%
Correct Answer
A
Correct Option:
Theoretical mass = 1.87 g; percent yield = 80.4%

About This Question

This is Waec Model Questions Vol1 2018 Chemistry Question 3. It is one of the objective questions from the 2018 Waec Model Questions Vol1 Chemistry examination.

Difficulty level: Medium .

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