What is the atomic weight of an element X for which a sample containing 1.58 10^ 22 atoms weight 1.05 g?

MHT CET Chemistry question

What is the atomic weight of an element X for which a sample containing atoms weight 1.05 g?

Answer: (C)

Moles = 1.58×10²²/6.022×10²³ = 0.02624, so atomic weight = 1.05/0.02624 = 40

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Question ID VK-041142