Question

calculate the number of molecules in 5.5 g of NH3. [atomic mass of N=14 and H=1].

Answer 1

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Answer 2

Answer: $1.92\times 10^{23}$

Explanation:

To calculate the moles, we use the formula:

$Moles=\frac{\text{Given mass}}{\text{Molar mass}}$

${\text {moles of ammonia}=\frac{5.5}{17g/mol}=0.32moles$

1 mole molecule of $NH_3$ contains =$6.023\times 10^{23}$ molecules of ammonia

0.32 moles of $NH_3$ contains =$\frac{6.023\times 10^{23}}{1}\times 0.32=1.92\times 10^{23}$ molecules of ammonia