First slide

Enthalpy of formation

Question

Given that S_(s) + $\frac{3}{2}$ O_2(g)→ SO_3(g)+ 2xK.Cal .
SO₂(g) + $\frac{1}{2}$ O_2(g) → SO_3(g) + yK.Cal . The enthalpy of formation SO₂ will be

Moderate

A

2x-y
B

2x+y
C

y-2x
D

y-x

Solution

$S (s) + \frac{3}{2} O_{2} (g) \to {SO}_{3} (g), ∆ H = - 2 x Kcals . . . . (1) {SO}_{2} (g) + \frac{1}{2} O_{2} (g) \to {SO}_{3} (g), ∆ H = - y Kcals . . . . (2) Eq (1) - Eq (2) S (s) + O_{2} (g) \to {SO}_{2} (g), ∆ H = y - 2 x;$

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