Consider the following data Heat of combustion of H2(g) = – 241.8 kJ mol–1 Heat of combustion of C(s) = – 393.5 kJ mol–1 Heat of combustion of C2H5OH(l) = – 1234.7 kJ mol–1 The heat of formation of C2

Question

Consider the following data Heat of combustion of H2(g) = – 241.8 kJ mol–1 Heat of combustion of C(s) = – 393.5 kJ mol–1 Heat of combustion of C2H5OH(l) = – 1234.7 kJ mol–1 The heat of formation of C2H5OH(l) is (–)_________ kJ mol–1 (Nearest integer)

Prashant Kotian · Accepted Answer

Correct answer: .. 2C(s) + 3H2(g) + 2 1 O2(g)   C2H5OH H = ? given (i) C(s) + O2(g)   CO2(g) H1 = – 393.5 KJ/Mole (ii) H2(g) + 2 1 O2(g)   H2O(l)  H = – 241.8 KJ/Mole (iii) C2H5OH + 3O2(g)   2CO2(g) + 3H2O H = – 1234.7 KJ/Mole Target eq. = 2 x eq. I + 3 eq. II – eq. III = 2 (-393.5) + 3 (-241.8) – (-1234.7) = 278 KJ/Mole | JEE(Main) 2023 | DATE : 06-04-2023 (SHIFT-2) | PAPER-1 | CHEMISTRY PAGE # 9

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