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The work done during combustion of `9 xx 10^(-2)` kg of ethane, `C_(2)H_(6)(g)` at 300 K is (Given R=8.314 J `deg^(-1) mol^(-1)`, atomic mass C = 12, H=1)A. 6.236 kJB. `-6.236` kJC. 18.71 kJD. `-18.71` kJ |
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Answer» Correct Answer - C Ethane on combustion gives `CO_(2)` and `H_(2)O` as `C_(2)H_(6)(g) + 7/2 O_(2)(g) to 2CO_(2)(g) + 3H_(2)O(l)` `Deltan = sumn_(g)("product") - sum n(g) ("reactant")` `=(2)-(1+3.5) = -2.5` W=`-Deltan RT` `=(-2)(-2.5) xx 8.314 xx 300` `=625.55` J `=6.2355` kJ The molar mass of `C_(2)H_(6)` is =30 g mol For 30 g, `W=+6.2 355` kJ For 90g, `W = 3 xx 6.2355 kJ = 18.71` kJ |
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