ANSWER
The mole of helium is 1.82723 moles
STEP-BY-STEP EXPLANATION:
Given information
The volume of helium = 40.93L
Let x represents the number of moles of oxygen
Recall that, 1 mole is equivalent to 22.4 L at STP
[tex]\begin{gathered} 1\text{ mole }\rightarrow\text{ 22.4L } \\ x\text{ mole }\rightarrow\text{ 40.93L} \\ \text{cross multilply} \\ 1\text{ mole }\times\text{ 40.93L = x mole }\times\text{ 22.4L} \\ x\text{ mole = }\frac{1\text{ mole }\times\text{ 40.93}\cancel{L}}{22.4\cancel{L}} \\ x\text{ mole = }\frac{40.93}{22.4} \\ x\text{ mole = 1.82723 moles} \end{gathered}[/tex]Therefore, the mole of helium is 1.82723 moles
