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Thermodynamics question

2013 · Q111
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Thermodynamics question

2013 · Q111

NEETChemistryThermodynamicsMCQ+4 / −1
Three thermochemical equations are given below
(i)  C(graphite) + O2(g) →\to→ CO2(g); Δ\DeltaΔrHo = x kJ mol−-−1
(ii)  C(graphite) + 12{1 \over 2}21​O2(g) →\to→ CO(g); Δ\DeltaΔrHo = y kJ mol−-−1
(iii)  CO(g) + 12{1 \over 2}21​O2(g) →\to→ CO2(g); Δ\DeltaΔrHo = z kJ mol−-−1
Based on the above equations, find out which of the relationship given below is correct.
  1. A
    z = x + y
  2. B
    x = y + z
  3. C
    y = 2z −-− x
  4. D
    x = y −-− z
View written solutionFree

Correct answer: B

According to Hess's law, equation (i) is equal to equations (ii) + (iii)

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