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24 February, 00:53

The gasification of coal is a method of producing methane by the following reaction. C (s) + 2H2 (g) → CH4 (g) ∆H=?

Find ∆H by using the enthalpy changes in the following combustion reactions:

C (s) + O2 (g) → CO2 (g) ∆H=-394 kj

H2 (s) + ½ O2 (g) → H2O (l) ∆H=-286kj

CH4 (g) + 2O2 (g) → CO2 (g) + 2H2O (l) ∆H=-891kj

(A) 75 kJ

(B) - 75 kJ

(C) 1856 kJ

(D) - 1856 kJ

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Answers (2)
  1. 24 February, 01:01
    0
    Using Hess' Law, we can calculate the heat of reaction of the gasification of coal. Multiplying the second reaction by 2 and reversing the third reaction:

    C (s) + O2 (g) → CO2 (g) ∆H=-394 kj

    2H2 (s) + O2 (g) → H2O (l) ∆H=-572kj

    CO2 (g) + 2H2O (l) → CH4 (g) + 2O2 (g) ∆H=891kj

    Adding the three reaction would result to

    C (s) + 2H2 (g) → CH4 (g) ∆H = - 394 + - 572 + 891 = - 75 kJ

    The answer is

    (B) - 75 kJ
  2. 24 February, 01:15
    0
    Hello there.

    The gasification of coal is a method of producing methane by the following reaction. C (s) + 2H2 (g) → CH4 (g) ∆H=?

    Find ∆H by using the enthalpy changes in the following combustion reactions:

    C (s) + O2 (g) → CO2 (g) ∆H=-394 kj

    H2 (s) + ½ O2 (g) → H2O (l) ∆H=-286kj

    CH4 (g) + 2O2 (g) → CO2 (g) + 2H2O (l) ∆H=-891kj

    (B) - 75 kJ
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