Chemistry

Problem

A balloon is filled with

2.4 \times 10^{-3}

mole of He at

27^\circ\text{C}

and

80 \text{ mm}

pressure. An additional amount of He (

1.2 \times 10^{-3}

mole) is added at the same temperature showing a rise in volume by

50\%

. The final pressure of gas in balloon in

\text{cm}

is ....