Answer
Theoretical mass of Cu = 123.35 g
Step-by-step explanation
Given:
Balanced equation: CuO + H2 → Cu + H2O
mass of CuO = 154.4 g
We know:
molar mass of CuO = 79,545 g/mol
molar mass of Cu = 63,546 g/mol
Required: Theoretical yield of Cu
Solution:
Step1: Find the number of moles of CuO and use stoichiometry to find moles of Cu
n = m/M where n is the moles, m is the mass and M is the molar mass
n = 154.4 g/79,545 g/mol
n = 1.94 mol
Now we can use stoichiometry to find moles of Cu, the molar ratio between CuO and Cu is 1:1
Therefore the number of moles of Cu = 1.94 mol
Step 2: Find the theoretical mass of Cu
m = n x M
m = 1.94 mol x 63,546 g/mol
m = 123.35 g