Gce Model Questions Vol1 2018 Chemistry Question 43

Practice objective / multiple choice question 43 from the 2018 Gce Model Questions Vol1 Chemistry examination.

Gce Model Questions Vol1 2018 Chemistry Objective / Multiple Choice Easy Difficulty

Question 43 GCE_MODEL_QUESTIONS_VOL1 • 2018 • CHEMISTRY • objective

Element X has two naturally occurring isotopes: \({}^{28}\mathrm{X}\) with an abundance of 75.0 % and atomic mass 27.9769 u, and \({}^{30}\mathrm{X}\) with an abundance of 25.0 % and atomic mass 29.9738 u. Calculate the average atomic mass of element X.

Answer Options

A. 28.0 u

Correct Answer B. 28.5 u

C. 27.5 u

D. 29.0 u

Correct Answer

Correct Option:

28.5 u

About This Question

This is Gce Model Questions Vol1 2018 Chemistry Question 43. It is one of the objective questions from the 2018 Gce Model Questions Vol1 Chemistry examination.

Difficulty level: Easy .

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Gce Model Questions Vol1 2018 Chemistry Question 43

Element X has two naturally occurring isotopes: \({}^{28}\mathrm{X}\) with an abundance of 75.0 % and atomic mass 27.9769 u, and \({}^{30}\mathrm{X}\) with an abundance of 25.0 % and atomic mass 29.9738 u. Calculate the average atomic mass of element X.

Answer Options

About This Question

Master the Exam!

Element X has two naturally occurring isotopes: \({}^{28}\mathrm{X}\) with an abundance of 75.0 % and atomic mass 27.9769 u, and \({}^{30}\mathrm{X}\) with an abundance of 25.0 % and atomic mass 29.9738 u. Calculate the average atomic mass of element X.