Help me to show my work step

Question

How many moles of ammonia would be required to react exactly with 0.342 moles of copper(II) oxide in the following chemical reaction? 2 NH₃(g) + 3 CuO(s) → 3 Cu(s) + N₂(g) + 3 H₂O(g)

Answer 1

Known: 0.342 moles CuO

Unknown: ? moles NH3

This is a mole-mole stoichiometry problem since we are given moles of one substance and asked for moles of another substance. We will use the coefficients in the balanced chemical equation to find the MOLE RATIO to solve this problem.

0.342 moles CuO x 2 moles NH3

3 moles CuO

We write it this way so that unit "moles CuO" will cancel out and we will be left with "moles NH3".

Mathematically, we will multiply 0.342 by 2 and then divide the result by 3.

Our answer is 0.228 moles NH3.