Question

The number of atoms in $10$ litres of ammonia are:

(Molecular Weight of $N=14$ g/mole, $H=1$ g/mole)

• A. $0.893\times 6.023\times {10}^{23}$ atoms
• B. $0.786\times 6.023\times {10}^{23}$ atoms
• C. $3.572\times 6.023\times {10}^{23}$ atoms
• D. $1.786\times 6.023\times {10}^{23}$ atoms

Answer 1

The correct option is D $1.786\times 6.023\times {10}^{23}$ atoms

Moles of ammonia $=\frac{10}{22.4}$.

Each ammonia molecules contains total $4$ atoms

So number of atoms in $10$ litres of ammonia is $(4\times \frac{10}{22.4})\times N_A=1.786\times 6.023\times {10}^{23}$