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29 April, 23:34

Enthalpy changes that are difficult to measure directly can often be determined using Hess' Law

to construct an enthalpy cycle.

Which enthalpy change is indicated by X in the enthalpy cycle shown?

C (s) + 2H2 (g) + 2O2 (g)

CH4 (g) + 2O2 (g) CO2 (g) + 2H2O (l)

X

A - 4 * the enthalpy of combustion of hydrogen

B + 4 * the enthalpy of combustion of hydrogen

C - 2 * the enthalpy of formation of water

D + 2 * the enthalpy of formation of water

from may june 14 zone 11 q 3 a levels

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Answers (1)
  1. 30 April, 00:07
    0
    Hess’ Law states that the heat of formation of the substances is the summation of the products minus the summation of the reactants in a chemical equation.

    The change in enthalpy indicated by X is - 2 multiplied by the formation of water. The answer is letter C.
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