Question

Find the weight of $0.2\text{moles}$ of ${\text{H}}_2$ gas.

Answer 1

Step 1: Given information

$0.2\text{moles}$ of Hydrogen $\left({\text{H}}_2\right)$ gas.

Step 2: Calculation of molecular weight of ${\text{H}}_2$ gas

The molecular weight of ${\text{H}}_2$ $=\left(2\times 1\right)\mathrm{g}=2.0\mathrm{g}$.

Step 3: Calculation of weight of $0.2\text{moles}$ of Hydrogen $\left({\text{H}}_2\right)$ gas

The weight of $1\text{mol}$ of ${\text{H}}_2$ is $2.0\text{g}$.

Thus, the weight of $0.2\text{mol}$ of ${\text{H}}_2$ is $0.2\text{×2.0}\mathrm{g}=0.4\mathrm{g}$

Hence, the weight of $0.2\text{moles}$ of ${\text{H}}_2$ gas is $0.4\text{g}$.