Question

A container has a volume of `48 L` and holds `12 mol` of gas. If the container is compressed such that its new volume is `18 L`, how many moles of gas must be released to maintain a constant temperature and pressure?

Answer 1

4.5 moles

Explanation:

Let's use Avogadro's law to calculate the answer:

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

Identify your known and unknown variables:

`color(teal)("Knowns:"`
`v_1`= 48 L
`v_2`= 18 L
`n_1`= 12 mol

`color(maroon) ("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=(18cancelLxx12mol)/(48cancel"L")` = `4.5 mol`