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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