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Given C_(("graphite"))+O_(2)(g)toCO_(2)(g), Delta_(r)H^(@)=-393.5kJmol^(-1) H_(2)(g)+1/2O_(2)(g)toH_(2)O(l), Delta_(r)H^(@)=-285.8kJmol^(-1) CO_(2)(g)+2H_(2)O(l)toCH_(4)(g)+2O_(2)(g), Delta_(r)H^(@)=+890.3kJmol^(-1) Based on the above thermochemical equations, the value of Delta_(r)H^(@) at 298 K for the reaction C_(("graphite"))+2H_(2)(g)toCH_(4)(g) will be : |
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Answer» `+144.0kJmol^(-1)` |
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