What is the mass percent of carbon, hydrogen, nitrogen, and oxygen in caffeine, C8H10N4O2.

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Chemistry

5 September, 06:39

What is the mass percent of carbon, hydrogen, nitrogen, and oxygen in caffeine, C8H10N4O2.

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Cale Mercado · Answer 1

M (C₈H₁₀N₄O₂) = 194.193 g/mol

w (C) = 8A (C) / M (C₈H₁₀N₄O₂)

w (H) = 10A (H) / M (C₈H₁₀N₄O₂)

w (N) = 4A (N) / (C₈H₁₀N₄O₂)

w (O) = 1-{w (C) + w (H) + w (N) }

w (C) = 8·12.011/194.193=0.4948

w (H) = 10·1.008/194.193=0.0519

w (N) = 4·14.007/194.193=0.2885

w (O) = 0.1648