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Calculate the value of (DeltaH - DeltaE)...

Calculate the value of `(DeltaH - DeltaE)`in calories for the combustion of `CH_4` at `27^@C`. 

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`CH_(4(g)) + 2O_(2(g)) to CO_(2(g)) + 2H_2O_((l))`
Change in the number of moles
`Delta n = n_P - n_R = 1 - 3 = -2 , DeltaH = DeltaE + DeltanRT`
`DeltaH - DeltaE = -2 xx 2 xx 300 = -1200 ` calories.
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