Mass of oxygen gas needed to burn 37.5g of wax

Question

Benjamin Melendez

Chemistry

10 December, 11:58

Mass of oxygen gas needed to burn 37.5g of wax

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Answers (1)

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Julissa Hanson · Answer 1

Answer is: mass oxygen is 129,28 grams.

Chemical reaction: 2C₁₈H₃₈ + 55O₂ → 36CO₂ + 38H₂O.

m (C₁₈H₃₈) = 37,5 g.

n (C₁₈H₃₈) = m (C₁₈H₃₈) : M (C₁₈H₃₈).

n (C₁₈H₃₈) = 37,5 g : 254 g/mol.

n (C₁₈H₃₈) = 0,147 mol.

From chemical reaction: n (C₁₈H₃₈) : n (O₂) = 2 : 55.

n (O₂) = 4,04 mol.

m (O₂) = 4,04 mol · 32 g/mol.

m (O₂) = 129,28 g.