engineering recuitment BARC Stipendiary Trainee Category I 2023 Mock Test Chemistry Thermodynamics Thermochemistry
For the reaction, H2(g) + O2(g) → H2O2(g). the standard enthalpy change in kJ/mol is:
[Bond enthalpies of H-H, O=O, O-H and O-O are 438 kJ/mol, 498 kJ/mol, 464 kJ/mol and 138 kJ/mol respectively]
1
-130
2
+334
3
+130
4
-334