Use molar volume to solve the following problems at STP

Question

1. Find the volume (L) occupied by 2.90 moles N2.
2. Find the volume (mL) occupied by 0.490 mole He.
3. Find the number of grams of neon contained in 11.6 L Ne gas.
4. Find the number of grams of neon contained in 11.6 L Ne gas.

Answer 1

Remember that at STP (standard temperature and pressure) 1 mole of any ideal gas occupies 22.4 liters.

#1. 2.90 moles x 22.4 L/mole = 65.0 L

#2. 0.490 moles x 22.4 L/mole = 11.0 L

#3. 11.6 L x 1 mole/22.4 L = 0.518 moles x 20.2 g/mole Ne = 10.5 g

$4 is the same as #3