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chemistry:enthalpy changes !!!!!!

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ruby92:
the chief gas in bio gas is methane
(a)the standard enthalphy change of formation deltaHf (CH4) cannot be measured directly.
i calculate the standard enthalpy change of formation of methane from the deltaHc values below
     substance        deltaHc
CH4                          -890
C                             -393.5
H2                            -285.9

ii suggest why the enthalpy change of formation of methane cannot be measured directly?

Saladin:
There u go.

ruby92:
thnk u so muchhh :D

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