Chapter U3, Problem 8STP

Interpretation Introduction

Interpretation:

The change in the volume of the gas needs to be explained if temperature is increased at constant pressure and number of moles.

Concept introduction:

The concept is based onCharles’sLaw which states that at pressure and number of moles, the volume of the gas is directly proportional to the temperature of the gas.It means if temperature increase, volume increases and if temperature decreasesthen volume decreases with constant pressure and number of moles of gas.

Also,

$V\propto T$

Answer to Problem 8STP

Option (C) is correct.

Explanation of Solution

Reason for correct option:

When the gas temperature increases then the volume also increases because the kinetic energy of the gas particles increases and they occupy more space.

Conclusion

Reasons for incorrect options:

Option (a) is incorrect because on increasing the temperature, the space between gaseous particles increases and they are not close to each other thus, volume increases.

Option (b) is incorrect because on increasing the temperature, the kinetic energy of the molecules of gas increases so they collide with more gaseous molecules.

Option (d) is incorrect because the attraction between the molecules is not the reason for increase in volume.