JAMB Chemistry 2012 Objective — Question 3

Question 3 of 50 from the Joint Admissions and Matriculation Board (JAMB) Chemistry 2012 Objective paper, with the correct answer and a full explanation.

How many atoms are present in 6.0g of magnesium? [Mg=24, Na=6.02×10²³ mol⁻¹]

A. 1.20×10²²
B. 2.41×10²³
C. 1.51×10²³Correct
D. 3.02×10²³

Explanation

Mass of magnesium = 6.0g. Molar mass of magnesium = 24g/mol. Mole = Mass/Molar mass = 6/24 = 0.25mol. Number of Mg atoms = Mole of Mg × Avogadro's number = 0.25×6.02×10²³ = 1.505×10²³.

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