Question

The number of molecules in $1.5$ litres of water are:

(Density of water is $1$ $g/c{m}^3$)

• A. $83.33\times 6.023\times {10}^{21}$
• B. $83.33\times 6.023\times {10}^{23}$
• C. $53.33\times 6.023\times {10}^{23}$
• D. $73.33\times 6.023\times {10}^{21}$

Answer 1

The correct option is B $83.33\times 6.023\times {10}^{23}$

Mass of water $\Rightarrow 1.5\times 1000=1500$ g
Moles of water $=\frac{1500}{18}=83.33$ moles
So, the number of molecules of water $=83.33\times 6.023\times {10}^{23}$ molecules