How many gram of $\mathrm{H}_2 \mathrm{O}$ are present in $0.25 \mathrm{~mol}$ of it?

How many gram of $\mathrm{H}_2 \mathrm{O}$ are present in $0.25 \mathrm{~mol}$ of it?
  1. 0.25 g
  2. 5.4 g
  3. 4.5 g
  4. 6.1 g

Solution

moles $=\frac{\text { mass }}{\text { Molar mass }}$ $\begin{aligned} & \text { Mass }=\text { moles } \times \text { Molar mass of } \mathrm{H}_2 \mathrm{O} \\ & =0.25 \times 18 \\ & =4.5 \mathrm{~g}\end{aligned}$

Asked in: MHT CET 2021 (24 Sep Shift 2)

Practice more Some Basic Concepts of Chemistry questions on Aicharya