MediumChemistry
+4 / -1
A hypothetical reaction , A → 2B, proceeds through following sequence of steps - A → C; ΔH = q₁ C → D; ΔH = q₂ 1/2 D → B; ΔH = q₃ The heat of reaction is :
A
q₁ − q₂ + 2q₃
B
q₁ + q₂ − 2q₃
C
q₁ + q₂ + 2q₃
D
q₁ + 2q₂ − 2q₃
Explanation
Multiplying the third step by 2 gives D → 2B, ΔH = 2q₃. Adding all steps gives A → 2B. Hence ΔH = q₁ + q₂ + 2q₃.
More from Thermodynamics
Hard
Which of the following is correct option for free expansion of an ideal gas under adiabatic conditio
HardUnder the same conditions how many ml of 1 M KOH and 0.5 M H₂SO₄ solutions respectively when mixed f
Hard1 gm H₂ gas at S.T.P. is expanded so that volume is doubled. Hence work done is -
HardThe lattice enthalpy and hydration enthalpy of four compounds are given below – Compound Lattice ent
HardStandard enthalpies of formation of O₃, CO₂, NH₃ and HI are 142.2, −393.2, −46.2 and +25.9 kJ mol⁻¹
HardConsider the following reactions at 1000°C - I. Zn(s) + 1/2 O₂(g) → ZnO(s); ΔG° = −360 kJ mol⁻¹ II.
Practice Chemistry Exams
Full-length mock tests with detailed analytics, rank, and percentile.
Browse Exams