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A container has a volume of #18 L# and holds #15 mol# of gas. If the container is expanded such that its new volume is #24 L#, how many moles of gas must be injected into the container to maintain a constant temperature and pressure?

Answer 1

William Audy

The number of moles to be injected is #=5 mol#

We apply Avogadro's Law

#V_1/n_1=V_2/n_2#

Initial volume is #V_1=18L#

Initial number of moles #n_1=15mol#

Final volume is #V_2=24L#

Final number of moles is

#n_2=V_2/V_1*n_1#

#=24/18*15#

#=20mol#

Number of moles to be injected is #=n_2-n_1=20-15=5mol#

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Answer 2

Xavier Adame

The container must have 20 moles of gas injected into it to maintain a constant temperature and pressure.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.