Number of atoms present in 1.6 g of methane is:

The correct option is D $3.01\times {10}^{23}$
The molar mass of methane is 16 g/mol.
1 molecule of methane contains 5 atoms
1 mole of methane contains $6.02\times {10}^{23}$ molecules.
Number of atoms present in 1.6 g of methane is:
$6.02\times {10}^{23}\times \frac{1.6g}{16g/mol}\times 5=3.01\times {10}^{23}$ atoms.