A sample of ideal gas is in a sealed container. The pressure of the gas is 485 torr, and the temperature is 40 ∘C. If the temperature changes to 74 ∘C with no change in volume or amount of gas, what is the new pressure, P2, of the gas inside the container?

537.68 torr.

Explanation:

We can use the general law of ideal gas: PV = nRT.

where, P is the pressure of the gas in atm.

V is the volume of the gas in L.

n is the no. of moles of the gas in mol.

R is the general gas constant,

T is the temperature of the gas in K.

If n and V are constant, and have different values of P and T:

(P₁T₂) = (P₂T₁).

P₁ = 485 torr, T₁ = 40°C + 273 = 313 K,

P₂ = ? torr, T₂ = 74°C + 273 = 347 K.

∴ P₂ = (P₁T₂) / (P₁) = (485 torr) (347 K) / (313 K) = 537.68 torr.