Answer to Question #89232 in Organic Chemistry for ALEBINDE ZAYAANU MOHAMMED

Question

How many hydrogen molecules are needed for complete catalytic hydrogenation of 0.5 moles of thetricylglycerol which forms glycerol, palmitic acid, oleic acid and linoleic acid by hydrolysis?

Answer 1

n(C₁₅H₃₁COOH) = 0.5 mol.

n(C₁₇H₃₃COOH) = 0.5 mol.

n(C₁₇H₃₁COOH) = 0.5 mol.

C₁₅H₃₁COOH + H₂ ≠

   0.5mol        Xmol

C₁₇H₃₃COOH + H₂ = C₁₇H₃₅COOH

      1mol         1mol

n₁(H₂) = X = 0.5 mol.

   0.5mol        Ymol

C₁₇H₃₁COOH + 2H₂ = C₁₇H₃₅COOH

      1mol         2mol

n₂(H₂) = X = 1 mol.

n(H₂) = n₁(H₂) + n₂(H₂) = 0.5 mol + 1 mol = 1.5 mol.

N(H₂) = n(H₂) × N_A = 1.5 mol × 6.02 × 10²³ mol^-1 = 9.03 × 10²³.