Combined Gas Laws

Question

A sample of neon gas occupies a volume of 6.13 L at 59.0°C and 327 torr.

If the volume of the gas sample is increased to 7.31 L, while its temperature is decreased to 5.0°C, the resulting gas pressure will be
torr.

Answer 1

PV/T = constant if the amount of gas does not change

 

P₁V₁ / T₁ = P₂V₂ / T₂ ⇒ 

 

P₂ = (T₂/T₁)(V₁/V₂)P₁

 

T₂ = (5.0 + 273) K

T₁ = (59.0 + 273) K

V₁ = 6.13 L

V₂ = 7.31 L

P₁ = 327 torr

 

Plug in the numbers (use absolute temperature), and get P₂ in units of torr.