Question

To use Charles' Law, which of the following needs to remain constant?

• A. Pressure and the number of moles of a gas
• B. Pressure and temperature
• C. Temperature and the number of moles of a gas
• D. Pressure and volume
• E. Temperature and volume

Answer 1

The correct option is A Pressure and the number of moles of a gas

(A) : At constant pressure and number of moles.
Charles's Law: When the pressure on a sample of a dry gas is held constant, the Kelvin temperature and the volume will be directly related as:
$V\alpha T$ , at constant pressure and number of moles.
Hence, if the temperature is doubled the volume will also be doubled.