Question

What is the volume in liters of 5.25 moles of He gas?​

Answer 1

`\boxed {\boxed {\sf 117.6 \ L \ He}}`

Step-by-step explanation:

Regardless of the type of gas, 1 mole at standard temperature and pressure (STP) occupies a volume of 22.4 liters. In this case the gas is helium (He).

We can set up a ratio.

`\frac { 22.4 \ L \ He}{ 1 \ mol \ He}`

Multiply by the given number of moles.

`5.25 \ mol \ He *\frac { 22.4 \ L \ He}{ 1 \ mol \ He}`

The moles of helium will cancel.

`5.25 *\frac { 22.4 \ L \ He}{ 1 }`

`5.25 * { 22.4 \ L \ He}`

Multiply.

`117.6 \ L \ He`

5.25 moles of helium gas at STP is 117.6 liters of helium.