mass of Cu = 184.15 g
Explanation:
We have the following chemical reaction:
2 Cu + O₂ → 2 CuO
Knowing the chemical reaction we devise the following reasoning:
if 2 moles of Cu produces 2 moles of CuO
then X moles of Cu produces 2.9 moles of CuO
X = (2 × 2.9) / 2 = 2.9 moles of Cu
And now to find the mass of copper (Cu) we use the following formula:
number of moles = mass / molar weight
mass = number of moles × molar weight
mass of Cu = 2.9 × 63.5
mass of Cu = 184.15 g
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number of moles
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