Question

Consider separate 1.0 L samples of the following gases at STP: Cl2, C2H6, and Xe. Which of the following statements are true regarding these gas samples?

The C2H6 gas sample has the smallest average kinetic energy.

The mass of the gas in each container is the same.

The C2H6 gas molecules collide with the container walls most frequently.

The C2H6 gas sample has the lowest density.

Each Cl2 gas particle collision with the container wall is more forceful as compared to each C2H6 and Xe collision.

The Cl2 gas sample has the most molecules of gas present.

Answer 1

Consider separate 1.0 L samples of the following gases at STP: Cl2, C2H6, and Xe. Which of the following statements are true regarding these gas samples?

1) The C2H6 gas sample has the smallest average kinetic energy.: false

The average kinetic energy is independant of molar mass of gas and it depends upon temperature only so the average kinetic energy will be same for all

2) The mass of the gas in each container is the same.: false

The same volume of each gas at STP will have same moles, however due to difference in molar mass the mass of each gas will different from each other

3) The C2H6 gas molecules collide with the container walls most frequently.: true

It is the lightest among given gases

4) The C2H6 gas sample has the lowest density.

true

density = mass / volume , so it will have lowest mass being the lightes (lowest molar mass)

5) Each Cl2 gas particle collision with the container wall is more forceful as compared to each C2H6 and Xe collision.

False

Xe being more heavy will collide more forcefully

6) The Cl2 gas sample has the most molecules of gas present: false ,

the molecules of each gas will be the same as volume and temperature and pressure are same.