If you feed 100 kg of n2 gas and 100 kg of h2 gas into a
reactor: what is the maximum number of kg of nh3 that can be
produced?

Answer : The mass of ammonia produced can be, 121.429 k

Solution : Given,

Mass of = 100 kg  = 100000 g

Mass of = 100 kg = 100000 g

Molar mass of = 28 g/mole

Molar mass of = 2 g/mole

Molar mass of = 17 g/mole

First we have to calculate the moles of and .

Now we have to calculate the limiting and excess reagent.

The balanced chemical reaction is,

From the balanced reaction we conclude that

As, 1 mole of react with 3 mole of

So, 3571.43 moles of react with moles of

From this we conclude that, is an excess reagent because the given moles are greater than the required moles and is a limiting reagent and it limits the formation of product.

Now we have to calculate the moles of

From the reaction, we conclude that

As, 1 mole of react to give 2 mole of

So, 3571.43 moles of react to give moles of

Now we have to calculate the mass of

Therefore, the mass of ammonia produced can be, 121.429 kg

i just learnt this recently but i need to look through my notes again