Question

Number of atoms present in 1.6 g of methane is:

• A. $6.02\times {10}^{23}$
• B. $3.01\times {10}^{24}$
• C. $3.01\times {10}^{23}$
• D. $6.02\times {10}^{24}$

Answer 1

Answer: (C)

$3.01\times {10}^{23}$

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.