# A container has a volume of 48 L and holds 6 mol of gas. If the container is compressed such that its new volume is 24 L, how many moles of gas must be released to maintain a constant temperature and pressure?

We must release $3$ moles
As temperature and pressure is constant and volume has been reduced from $48 L$ to $24 L$, number of moles will also reduce from $6$ $m o l$ proportionately to $3$ moles.
Hence, we must release $6 - 3 = 3$ moles.