A sample of a gas in a rigid cylinder with a movable piston has a volume of a lamp then .2 L at STP. What is the volume of this gas at 202.6 kPa and 300 Calvin?

The new volume of the gas is 0.11 L

Explanation:

To calculate the volume when temperature and pressure has changed, we use the equation given by combined gas law.

The equation follows:

where,

are the initial pressure, volume and temperature of the gas

are the final pressure, volume and temperature of the gas

At STP:

The temperature at this condition is taken as 273 K and the pressure at this condition is taken as 1 atm or 101.3 kPa.

We are given:

Putting values in above equation, we get:

Hence, the new volume of the gas is 0.11 L

your answer is a. the enthalpy of formation for a pure element in its standard state is always positive.