MEDIUMMCQ SINGLEIChO (Chemistry Olympiad)Physical ChemistryThermodynamics and ThermochemistryPrevious Year Questions
Three thermochemical equations are given below: (i) C(graphite) + O₂(g) → CO₂(g); ∆rH° = x kJ mol–1 (ii) C(graphite) + ½O₂(g) → CO(g); ∆rH° = y kJ mol–1 (iii) CO(g) + ½O₂(g) → CO₂(g); ∆rH° = z kJ mol–1 Based on the above equations, find out which of the relationship given below is correct.
A.z = x + y
B.x = y + z✓ Correct
C.y = 2z – x
D.x = y – z
Explanation
According to Hess’s law, equation (i) is equal to equations (ii) + (iii) i.e., x = y + z
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