# Give me answer of this mcqs.

Please ask single question in single thread.

1) The molar mass of water is 18.

Thus, 18 g of water contains, Avogadro's number (${N}_{A}$)of water molecule.

Therefore, 540 g of water will have $\frac{540}{18}\times {N}_{A}=30{N}_{A}$

Hydrogen has no neutrons and oxygen has 8 neutrons.

Water compose of two hydrogen atoms and one oxygen atom.

Thus total number of neutrons in each water molecule is 8.

Therefore, total number of neutrons in 540 g of water is,

$30{N}_{A}\times 8=240{N}_{A}$

Answer is a.

Regards

**
**