When 10 grams of copper and 10 grams of iodine are mixed, what is the
theoretical yield of copper i iodide?
2cu + i2 → 2cui

30 grams

15 grams

7.5 grams

20 grams

15 grams

Explanation:

Mass of Cu = 10 g  

Molar mass of Cu = 63.546 g/mol

Moles of Cu =  = 0.1574

Mass of I₂ = 10 g  

Molar mass of I₂ = 253.8 g/mol

Moles of I₂ = = 0.04

I₂ here is the limiting reactant as it has the least number of moles.  

Based on the balanced equation,

1 mole of I₂ = 2 moles of CuI

0.04 mole of I₂ = 0.08 moles of CuI

Molar mass of CuI = 190.45 g/mol

Mass of CuI = 0.08 moles x 190.45 g/mol  = 15.236  g

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