MHT CET Chemistry question

What is the mass of one molecule of yellow phosphorus? (Atomic mass, P = 30)

Answer: (B)

Solution

Yellow phosphorus is P₄ (120 g mol⁻¹), so one molecule weighs 120/6.022×10²³ = 1.993×10⁻²² g = 1.993×10⁻¹⁹ mg; (a) forgets the g to

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Question ID VK-041133