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If /\H of the reactionCH(4(g))+C2H(4(g))...

If `/_\H` of the reaction`CH_(4(g))+C_2H_(4(g)) C_3H_(8(g))` is -19.4 kcals, what will be the `/_\H` of the reaction `C_3H_(8(g)) CH_(4(g))+C_2H_(4(g))` ?

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