How many moles of N2 are needed to make 5.0 moles of NH3?

The answer is "2.5 mole"

Explanation:

The reaction for producing can be defined as follows:

Reaction:

According to the above reaction, to produce 2 moles of  we need 1 mole of nitrogen:

So, according to the question to produce 5.0 mole the required :

To produce 5.0 mole  we need 2.5 mole

level 4 to level 2 : ))