Chemistry . . . . . . . I dont understand how to do this and my teacher is little help.

Question

In the reaction N2 + 3H2 Yields 2NH3, if 20.0g of hydrogen reacts, How many grams of NH3 are produced?

How many grams of N2 react?

Answer 1

N2 + 3H2 ==> 2NH3. ... balanced equation

You are given 20.0 g H₂ and asked to find g NH3 produced and g of N₂ reacted. To answer this, we must first convert to moles and then back to grams.

moles H₂ = 20.0 g x 1 mole/2 g = 10.0 moles H₂

moles N₂ reacted = 10.0 mol H₂ x 1 mol N₂/3 mol H₂ = 3.33 mol N_2.

grams N₂ = 3.33 mol x 28g/mol = 93.3 g

moles NH₃= 10.0 mol H₂ x 2 mol NH3/3 mol H₂ = 6.67 mol NH3

grams NH3 = 6.67 mol x 17 g/mol = 113 g NH₃