Question

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

Answer 1

∴ Molar mass of gold is 197 g mole^-1,

The number of atoms = 6.0 × 10²³

∴ No. of atoms is 39.4 g 

= \(\frac{6.0\times10^{23}\times39.4}{197}\) 

= 1.2 × 10²³