Question

How many moles does .365 liters of O2 gas represent

Answer 1

Step 1 - Understanding the molar volume

Every gas, in certain conditions known as STP conditions, occupies the same volume per mol. This is known as the molar volume, and corresponds to 22.4 L/mol. This means that each mole of a gas occupies 22.4 L (at STP).

Step 2 - Using the molar volume to solve the problem

Since we already know the relation between moles and volume in the STP, we can set the following proportion:

`\begin{gathered} 1\text{ mole occupies ---- 22.4 L} \\ 0.365\text{ moles occupies --- x} \\ \\ x=(22.4*0.365)/(1)=8.17\text{ L} \end{gathered}`

0.365 moles of O2 gas at STP occupies thus 8.17 L.