A container has a volume of #2 L# and holds #12 mol# of gas. If the container is compressed such that its new volume is #14 L#, how many moles of gas must be injected into the container to maintain a constant temperature and pressure?

1 Answer
Aug 16, 2016

Answer:

84 moles of gas must be injected into the container.

Explanation:

The answer can be determined by using Avogadro's law:

#v_1/n_1 = v_2/n_2#

The number 1 represents the initial conditions and the number 2 represents the final conditions.

Identify your known and unknown variables:

#color(gold)("Knowns:"#
#v_1#= 2 L
#v_2#= 14 L
#n_1#= 12 mol

#color(tan) ("Unknowns:"#
#n_2#

Rearrange the equation to solve for the final number of moles:

#n_2=(v_2xxn_1)/v_1#

Plug in your given values to obtain the final number of moles:

#n_2=(14 cancelLxx12mol)/(2\cancel"L")# = #84mol#