Answer:
![\boxed {\boxed {\sf 117.6 \ L \ He}}](https://tex.z-dn.net/?f=%5Cboxed%20%7B%5Cboxed%20%7B%5Csf%20117.6%20%5C%20L%20%5C%20He%7D%7D)
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}](https://tex.z-dn.net/?f=%5Cfrac%20%7B%2022.4%20%5C%20L%20%5C%20He%7D%7B%201%20%5C%20mol%20%5C%20He%7D)
Multiply by the given number of moles.
![5.25 \ mol \ He *\frac { 22.4 \ L \ He}{ 1 \ mol \ He}](https://tex.z-dn.net/?f=5.25%20%5C%20mol%20%5C%20He%20%2A%5Cfrac%20%7B%2022.4%20%5C%20L%20%5C%20He%7D%7B%201%20%5C%20mol%20%5C%20He%7D)
The moles of helium will cancel.
![5.25 *\frac { 22.4 \ L \ He}{ 1 }](https://tex.z-dn.net/?f=5.25%20%2A%5Cfrac%20%7B%2022.4%20%5C%20L%20%5C%20He%7D%7B%201%20%7D)
![5.25 * { 22.4 \ L \ He}](https://tex.z-dn.net/?f=5.25%20%2A%20%7B%2022.4%20%5C%20L%20%5C%20He%7D)
Multiply.
![117.6 \ L \ He](https://tex.z-dn.net/?f=117.6%20%5C%20L%20%5C%20He)
5.25 moles of helium gas at STP is 117.6 liters of helium.
Answer:
Batteries store chemical energy
Explanation:
It would be in the fourth shell.
To be honest, I learned this in school so I'll tell you XD
The formula of sodium oxide is Na2O