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Estimate the standard enthalpy of combus...

Estimate the standard enthalpy of combustion of `CH_4(g) " if " Delta_fH^0(CH_4) = - 74.8kJ mol^(-1), Delta_fH^0 (CO_2) = -393.5 kJ mol^(-1) and Delta_fH^0 (H_2O) = -285.8 kJ mol^(-1)`

Text Solution

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The equation for the combustion of `CH_4` is
`CH_4 (g) + 2O_2(g) to CO_2 (g) + 2H_2O(l), Delta_rH^0 = ?`
`Delta_r H^0 = [Delta_fH^0 (CO_2) + 2Delta_f H^0 (H_2O)]`
` - [Delta_fH^0 (CH_4) + 2 Delta_f H^0(O_2)]`
`= (1 xx (-393.5) + 2 xx (-285.8)]`
` - [1 xx (-74.8) + 2xx 0]`
`Delta_c H^0 (CH_4) = -890.3 kJ`
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