Gce Model Questions Vol1 2017 Chemistry Question 44

Practice objective / multiple choice question 44 from the 2017 Gce Model Questions Vol1 Chemistry examination.

Gce Model Questions Vol1 2017 Chemistry Objective / Multiple Choice Hard Difficulty
Question 44 GCE_MODEL_QUESTIONS_VOL1 • 2017 • CHEMISTRY • objective

An alloy consists of metals A and B. Metal A has a density of \(7.8\ \mathrm{g\ cm^{-3}}\) and metal B a density of \(11.3\ \mathrm{g\ cm^{-3}}\). A 10.0 g sample of the alloy occupies a volume of \(1.18\ \mathrm{cm^{3}}\). (i) Determine the mass percentages of A and B in the alloy. (ii) Given atomic masses \(M_A=55.8\ \mathrm{g\ mol^{-1}}\) and \(M_B=65.4\ \mathrm{g\ mol^{-1}}\), calculate the atomic percentages of A and B.

Answer Options

A. Mass % A ≈ 72.0 %, B ≈ 28.0 %; Atomic % A ≈ 75.0 %, B ≈ 25.0 %
Correct Answer B. Mass % A ≈ 74.3 %, B ≈ 25.7 %; Atomic % A ≈ 77.2 %, B ≈ 22.8 %
C. Mass % A ≈ 80.1 %, B ≈ 19.9 %; Atomic % A ≈ 83.5 %, B ≈ 16.5 %
D. Mass % A ≈ 68.5 %, B ≈ 31.5 %; Atomic % A ≈ 71.0 %, B ≈ 29.0 %
Correct Answer
B
Correct Option:
Mass % A ≈ 74.3 %, B ≈ 25.7 %; Atomic % A ≈ 77.2 %, B ≈ 22.8 %

About This Question

This is Gce Model Questions Vol1 2017 Chemistry Question 44. It is one of the objective questions from the 2017 Gce Model Questions Vol1 Chemistry examination.

Difficulty level: Hard .

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