Question

The volume of certain amount of an ideal gas is constant at STP. Which of the following changes is CORRECT at constant volume for the same amount of gas?

Options

• 273 K and 2 atm

• 273°C and 2 atm

• 546°C and 0.5 atm

• 0°C and 0 atm

Answer 1

273°C and 2 atm

Explanation:

P₁ = 1 atm, T₁ = 273 K, P₂ = ?, T₂ = ?

Gay Lussac's law states that

`P_1/T_1 = P_2/T_2` = constant

`1/273 = P_2/T_2` = constant

If P₂ = 2 atm and T₂ = 546 K (273°C)

Law of Gay Lussac, i.e. `1/273 = 2/546` holds good.