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AIIMS2005ChemistryThermodynamics (C)

H_f^ (298 ~K ) of methanol is given by the chemical equation

Options

  1. ACH _ 4(g) + 1 2 O _ 2(g) CH ₃ OH _ (g)
  2. BC (graphite) + 1 2 O _ 2(g) +2 H _ 2(g) CH ₃ OH
  3. CC (diamond) + 1 2 O _ 2(g) +2 H _ 2(g) CH ₃ OH
  4. DCO _ (g) +2 H _ 2(g) CH ₃ OH _ (l) .

Correct answer

B. C (graphite) + 1 2 O _ 2(g) +2 H _ 2(g) CH ₃ OH

Step-by-step solution

Methanol can be prepared synthetically by heating carbon monoxide and hydrogen gases under pressure in the presence of a catalyst. aligned & C (graphite) +1 / 2 O ₂ CO _ (g) & CO _ (g) +2 H _ 2(g) CH ₃ OH aligned C (graphite) +1 / 2 O _ 2(g) +2 H _ 2(g) CH ₃ OH _ (l)

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