Question

39.4kg of gold was recovered from a sumuggler.The number of atoms of gold recovered are?

Answer 1

the molar mass of gold = 196.97 g
number of atoms = given mass/molar mass × $6.022 × 10^{23}$ atoms
$\frac{39.4}{196.97}$× $6.022 × 10^{23}$ atoms 
⇒1.2 × $10^{23}$ atoms of gold