A gas occupies 5 L at20 °C and 1 atm. What is its volume at 2 atm and 27 °C?
The volume will be 2.6 L.
This looks like a case where we can use the combined gas laws:
#color(blue)(bar(ul(|color(white)(a/a)(p_1V_1)/T_1 = (p_2V_2)/T_2color(white)(a/a)|)))" "#
We can rearrange this formula to get
#V_2 = V_1 × p_1/p_2 × T_2/T_1#
NTP is 1 atm and 20 °C, so