Which conversion factor is needed to solve the following problem?

How many liters of ammonia gas (NH3), can be formed from 54.1 liters of hydrogen gas (H2) at STP?

3H2 + N2 --> 2NH3

Question options:

Molar Volume


Molar Mass of Hydrogen (H2)


Molar Mass of ammonia (NH3)


Avogadro's Number