Question

3. Which of the following statements is correct?

Answer 1

Answer:

3. 2.00 L of air at 100°C has twice the pressure of the same 2.00 L of air at  50°C

Explanation:

1)  doubling the pressure of a gas doubles its volume

This is incorrect because by increasing the pressure volume is going to be decreased.

2)  2.00 L of air at 227°C has twice the pressure of the same 2.00 L of air at  23°C

This is also incorrect because 2 L air at 227 °C will have the pressure more than twice time as compared to the 2L air at 23°C.

3. 2.00 L of air at 100°C has twice the pressure of the same 2.00 L of air at  50°C

This is correct;

According to Gay-Lussac Law,

The pressure of given amount of a gas is directly proportional to its temperature at constant volume and number of moles.

Mathematical relationship:

P₁/T₁ = P₂/T₂

thus, by increasing the temperature pressure is also goes to increase in the same ratio.

4. halving the pressure of a gas halves its volume

This is incorrect because halving the pressure of gas increasing its volume.