A container has a volume of #6 L# and holds #5 mol# of gas. If the container is compressed such that its new volume is #12 L#, how many moles of gas must be released to maintain a constant temperature and pressure?

1 Answer
Aug 8, 2018

Answer:

As the question is written, the number of moles can only be added is #=5mol#

Explanation:

Apply Avogadro's Law

#"Volume"/"Number of moles"= " Constant"#

At constant temperature and pressure

#V_1/n_1=V_2/n_2#

The initial volume is #=6L#

The initial number of moles is #n_1=5mol#

The final volume is #V_2=12L#

This is not a compression, it's an expansion

The final number of moles is

#n_2=V_2/V_1*n_1=12/6*5=10mol#

The number of moles to be added is

#=n_2-n_1=10-5=5mol#