A natural gas may be assumed to be a mixture fo methane and ethane only. On complete combustion of `10L` of gas at `STP` the heat evolved was `474.6 kJ`. Assuming `Delta_(comb) H^(Theta) CH_(4)(g) =- 894 kJ mol^(-1)` and composition of the mixture by volume.

A natural gas may be assumed to be a mixture fo methane and ethane onl

1.	A natural gas may be assumed to be a mixture fo methane and ethane only. On complete combustion of `10L` of gas at `STP` the heat evolved was `474.6 kJ`. Assuming `Delta_(comb) H^(Theta) CH_(4)(g) =- 894 kJ mol^(-1)` and composition of the mixture by volume.
Answer» `xL rarr CH_(4), "mole of" CH_(4) = x //22.4` `(10-x) L rarr C_(2)H_(6), "mole of" C_(2)H_(6) = (10-x)//22.4` Heat evolved `= (x)/(22.4) xx 894 +((10-x))/(22.4) xx 1500` `474.6 = (x)/(22.4) xx 894 +((10-x))/(22.4) xx 1500` `x = 0.745, % CH_(4) = 74.5%`

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A natural gas may be assumed to be a mixture fo methane and ethane only. On complete combustion of `10L` of gas at `STP` the heat evolved was `474.6 kJ`. Assuming `Delta_(comb) H^(Theta) CH_(4)(g) =- 894 kJ mol^(-1)` and composition of the mixture by volume.

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