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Three thermochemical equations are given below(1)C_(("graphite"))+O_(2)(g)rarrCO_(2)(g), Delta_(r) H^(@)=xkJ mol^(-1)(2)C_("graphite")+1//2O_(2)(g)rarrCO(g), Delta_(r)H^(@)=y kJ mol^(-1)(3)CO(g)+1//2O_(2)(g)rarrCO_(2)(g), Delta_(r)H^(@)=zkJ mol^(-1) Based on the above equations, find out which of the relationship given below is correct |
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Answer» Solution :Applying Hess's law `C_((g))+O_(2)rarrCO_(2(g))"x kJ mol"^(-1)"....(i)"` `{:(ul(C_((s))+(1)/(2)O_(2)rarrCO_((g))"y kJ mol"^(-1))"...(ii)"),(O_(2)-(1)/(2)O_(2(g))rarrCO_(2(g))-CO_((g))z kJ mol^(-1)"....(III)"):}` On substracting eq. (i) and (ii) we get `CO_((g))+(1)/(2)O_(2(g))rarrCO_(2(g)) thereforex-y=zimpliesx=y+z` |
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