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Thermodynamics
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NEET 2019
Thermodynamics
· Hess's Law and Enthalpy of Formation
medium
Q2.
Given the following thermochemical equations: 1. C(s) + O₂(g) → CO₂(g) ; ΔH₁ = -393.5 kJ mol⁻¹ 2. H₂(g) + ½O₂(g) → H₂O(l) ; ΔH₂ = -285.8 kJ mol⁻¹ 3. CH₄(g) + 2O₂(g) → CO₂(g) + 2H₂O(l) ; ΔH₃ = -890.3 kJ mol⁻¹ The enthalpy of formation of methane, CH₄(g), is:
A
-74.8 kJ mol⁻¹
B
+74.8 kJ mol⁻¹
C
-148.6 kJ mol⁻¹
D
+148.6 kJ mol⁻¹
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