# A sample of hydrogen gas is collected and found to fill 2.85 Lat 25.0°C. What will be its volume at exactly 0°C?

Sep 5, 2017

$P V = n R T$

$P V = n R T = P V$

Thus,

${P}_{1} {V}_{1} = {P}_{2} {V}_{2}$

Note: use absolute temperature (e.g. K)

$2.85 L \cdot 298.15 K = 273.15 K \cdot {V}_{2}$
$\therefore {V}_{2} \approx 3.11 L$