Question

1. If 100 mL of a gas, originally at 760 torr, is compressed to a pressure of 120 kPa

Answer 1

Answer : The final volume will be, 84.4 mL

Explanation :

Boyle's Law : It is defined as the pressure of the gas is inversely proportional to the volume of the gas at constant temperature and number of moles.

$P\propto \frac{1}{V}$

or,

$P_1V_1=P_2V_2$

where,

$P_1$ = initial pressure = 760 torr

$P_2$ = final pressure = 120 kPa = 900 torr   (1 kPa = 7.5 torr)

$V_1$ = initial volume = 100 mL

$V_2$ = final volume = ?

Now put all the given values in the above equation, we get:

$760torr\times 100mL=900torr\times V_2$

$V_2=84.4mL$

Therefore, the final volume will be, 84.4 mL