# How do you solve for V2, using Avogadro's Law when moles of a gas are added(n2)? A sample containing 7.20g O2 gas has a volume of 35.0L. Pressure and temperature remain constant. What is the new volume if 0.800mole O2 gas is added?

##### 1 Answer

Jun 24, 2014

The new volume is 159 L.

#### Explanation:

You can read about Avogadro's law at

http://socratic.org/questions/what-is-avogadro-s-law

In your problem,

So we have

If we add

This makes sense.

The number of moles increased by about fivefold, so the volume should have increased about five-fold (to about 175 L).