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Home / Doubts and Solutions/JEE/Chemistry

ques no 9..

Asked by chandanbr6004 13th November 2017, 9:23 PM
Answered by Expert
Answer:
increment straight H space equals space increment straight E plus space increment nRT increment straight E space equals space fraction numerator Heat space capacity cross times Rise space in space Temp cross times Molecular space mass over denominator Mass space of space comp end fraction space space space space space space equals space fraction numerator 18 cross times 0.25 cross times 16 over denominator 0.08 end fraction increment straight E space equals space minus 900 space KJmol to the power of minus space A s space combustion space reaction space is space there comma space it space is space space exothermic space so space the space sign space will space be space negative. increment straight H space equals space increment straight E plus space increment nRT space straight R equals 8.314 cross times 10 to the power of negative 3 end exponent space KJK to the power of minus mol to the power of minus straight T equals 300 space straight K space increment straight n equals 1 minus 3 space space space space space space space space space space space space space space space equals space minus 2 increment straight H space equals left parenthesis negative 900 right parenthesis plus left parenthesis negative 2 cross times 8.314 cross times 10 to the power of negative 3 end exponent cross times space 300 space right parenthesis space space space space space space space equals space minus 904.98 space KJ
Answered by Expert 14th November 2017, 12:33 PM
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