# A sample of gas has a volume of 425 mL at 25°C and 760 torr. What volume would this gas sample have at STP?

Jan 28, 2016

${V}_{2} = 389 m L$

#### Explanation:

At STP: P=760 torr and T=273K.

To solve this question, we could use Charles' law since both the number of mole and pressure are constant:

$\frac{{V}_{1}}{{T}_{1}} = \frac{{V}_{2}}{{T}_{2}}$

$\implies {V}_{2} = {T}_{2} \times \frac{{V}_{1}}{{T}_{1}}$

$\implies {V}_{2} = 273 \cancel{K} \times \frac{425 m L}{298 \cancel{K}} = 389 m L$