Question

$1.4{dm}^3$ of a gas at a STP weight $1.26\times {10}^3$ kg Calculate Molecular mass, Mass of 1 mole

Answer 1

We know that at STP weight (gm) of $22.4d{m}^3$ is molecular mass of a gas.

Now, the weight of $1.4d{m}^3$ gas is $1.26\times {10}^{-3}kg$.

$\therefore$ Molecular mass= $\frac{1.26\times {10}^{-3}\times {10}^3\times 22.4}{1.4}$

$=20.16g/mol$

$\therefore$ Mass of $1$ mole of gas= $20.16g$ .