Question

How many moles of helium gas occupy a 40.93L tank that is held at STP?

Answer 1

The mole of helium is 1.82723 moles

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

`\begin{gathered} 1\text{ mole }\rightarrow\text{ 22.4L } \\ x\text{ mole }\rightarrow\text{ 40.93L} \\ \text{cross multilply} \\ 1\text{ mole }*\text{ 40.93L = x mole }*\text{ 22.4L} \\ x\text{ mole = }\frac{1\text{ mole }*\text{ 40.93}\cancel{L}}{22.4\cancel{L}} \\ x\text{ mole = }(40.93)/(22.4) \\ x\text{ mole = 1.82723 moles} \end{gathered}`

Therefore, the mole of helium is 1.82723 moles