Question

Calculate the number of atoms in 39.4 g gold. Molar mass of gold is 197g mole^–1.

Answer 1

Moles (n) = mass ÷ molar mass
N = 39.4 ÷ 197
N = 0.2 moles

No of atoms = 0.2 × 6.02 ×10^23
= 1.204×10^23


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