Leve1 .The reaction which produces methanol from carbon monoxide and hydrogen is represented by the equation CO(g) + 2H2(g) U CH3OH(g) ∆H = –94kJ mol–1 The reaction is carried out at high pressure and the gases are passed through a mixture of zinc oxide and chromium oxide maintained at 400 °C. These conditions are chosen to give a good yield of methanol at a satisfactory rate. (a)(i)Explain why increasing the pressure gives a better yield. ................................................................................................................................ ................................................................................................................................ (1) (ii)Give one disadvantage of using high pressure in an industrial plant. ................................................................................................................................ ................................................................................................................................ (1) (b)(i)The value of ∆H is negative. What does this tell you about the reaction?
Posted on: Tue, 22 Jul 2014 15:09:35 +0000
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