Find the correct relationship between the magnitudes of heat evolved (x and y) in the following reactions.

Reaction (i):

C(g) + 4H(g) → CH₄(g)

Magnitude of heat evolved = x kJ mol⁻¹

Reaction (ii):

C(graphite) + 2H₂(g) → CH₄(g)

Magnitude of heat evolved = y kJ mol⁻¹