A container has a volume of #4 L# and holds #3 mol# of gas. If the container is expanded such that its new volume is #12 L#, how many moles of gas must be injected into the container to maintain a constant temperature and pressure?

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Answer 1 · 2018-04-11T08:47:17

If a container has a constant temperature and pressure this means it has a constant concentration.

In formulaic words:

#c_i = c_f#

Hence, since:

#c = n/v#

#n_i/v_i = n_f/v_f#

#3/4 = n_f/12#

#n_f = 9# #mol#

Therefore, #6# #mol# of gas must be added.