Neco 2019 Chemistry Question 41

Practice objective / multiple choice question 41 from the 2019 Neco Chemistry examination.

Neco 2019 Chemistry Objective / Multiple Choice Hard Difficulty
Question 41 NECO • 2019 • CHEMISTRY • objective

A 15.0 g sample of a reddish-brown metal oxide of formula \( \mathrm{M_2O_3} \) is reduced with carbon to give 9.0 g of the metal. When the metal is burnt in air, it forms the same oxide, gaining 0.44 g of oxygen per gram of metal. (a) Determine the atomic mass of the metal M. (b) Calculate the theoretical mass of metal that should be obtained from the reduction. (c) Determine the percent yield of the reduction.

Answer Options

A. Atomic mass ≈ 52.0 g·mol⁻¹; theoretical mass = 9.8 g; percent yield = 81.6 %
Correct Answer B. Atomic mass ≈ 55.9 g·mol⁻¹; theoretical mass = 10.5 g; percent yield = 85.7 %
C. Atomic mass ≈ 58.7 g·mol⁻¹; theoretical mass = 11.2 g; percent yield = 80.4 %
D. Atomic mass ≈ 55.9 g·mol⁻¹; theoretical mass = 9.0 g; percent yield = 90.0 %
Correct Answer
B
Correct Option:
Atomic mass ≈ 55.9 g·mol⁻¹; theoretical mass = 10.5 g; percent yield = 85.7 %

About This Question

This is Neco 2019 Chemistry Question 41. It is one of the objective questions from the 2019 Neco Chemistry examination.

Difficulty level: Hard .

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