What mass of copper(I) oxide (M = 143 g/mol) forms when 0.050 mol of ethanal reacts completely with Fehling’s solution?
Correct answer C. 7.15 g
Explanation
One mole of aldehyde reduces two Cu²⁺ ions, giving one mole of Cu₂O. So 0.050 mol ethanal gives 0.050 mol Cu₂O, and mass = 0.050 × 143 = 7.15 g.
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