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For the reaction 2CH4(g) +3Cl2(g) ->  2CHCl3(l) + 3H2(g), the standard enthaly of change of reaction = -118.6KJ. The standard enthalpy of change of reaction f= -134.1KJ/mol for CHCl3(l). Find the standard enthalpy of change of reaction f for CH4(g).
When K2SO4(aq) and Pb(NO3)2(aq) are mixed,a white colored precipitate forms.

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