# The pressure of a sample of dry air is held constant at 2.25 atm while the temperature is decreased rom 100 °C to 7 °C. The original volume of the sample is 43 L. What is the final volume of the sample?

Sep 14, 2017

${V}_{\text{final}} \cong 32 \cdot L$

#### Explanation:

We use old Charles' law.......$V \propto T$ at constant pressure.

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

And solve for ${V}_{2} = \frac{{V}_{1}}{{T}_{1}} \times {T}_{2}$

(43*L)/(373*K)xx280*K=??L