Question

a sample of xenon gas that occupies a volume of 20.3 l at a temperature of 0 °c and a pressure of 1 atm contains moles of gas.

Answer 1

.90625 moles of Xenon gas

Step-by-step explanation:

The gas is at STP(Standard Temperature & Pressure) of 0 C and 1 atm
When a gas is at STP we know that 1 mol of that gas covers a volume of 22.4L.

Using dimesional analysis we can find the answer:

20.3L Xenon gas ×
`(1 mol)/(22.4 L)` = 0.90625