Predict in how many of the following processes entropy change of the system is positive-i CaCO 3 s - CaO s - CO 2 g ii N 2 g -3 H 2 g - 2 NH 3 g iii HCl g - NH 3 g - NH 4 Cl s iv 2 SO 2 g - O 2 g - 2 SO 3 g v Cooling of N 2 g from 20- C to -50- CA- 2B- In all the processessC- 3D- 1

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Entropy of Phase Change

Predict in ho...

Question

Predict in how many of the following processes entropy change of the system is positive .
(i) $C a C O_{3} (s) \to C a O (s) + C O_{2} (g)$
(ii) $N_{2} (g) + 3 H_{2} (g) \to 2 N H_{3} (g)$
(iii) $H C l (g) + N H_{3} (g) \to N H_{4} C l (s)$
(iv) $2 S O_{2} (g) + O_{2} (g) \to 2 S O_{3} (g)$
(v) Cooling of $N_{2} (g)$ from $20^{o} C t o - 50^{o} C$

In all the processess

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C a C O_{3} (s) \to C a O (s) + C O_{2} (g)

N_{2} (g) + 3 H_{2} (g) \to 2 N H_{3} (g)

H C l (g) + N H_{3} (g) \to N H_{4} C l (s)

2 S O_{2} (g) + O_{2} (g) \to 2 S O_{3} (g)

N_{2} (g)

20^{o} C t o - 50^{o} C

A g (a q) + C l (a q) \to A g C l (s)

N H_{4} C l (s) \to N H_{3} (g) + H C l (g)

2 N H_{3} (g) \to N_{2} (g) + 3 H_{2} (g)

△ H > △ U

2 H_{2} O (l) ⟶ 2 H_{2} (g) + O_{2} (g)

N_{2} (g) + 3 H_{2} (g) ⟶ 2 N H_{3} (g)

C a C O_{3} (s) ⟶ C a O (s) + C O_{2} (g)

N H_{3} (g) + C O_{2} (g) + H_{2} O (l) ⟶ N H_{4} H C O_{3} (a q)

0.10

N H_{4} H C O_{3}

H_{2} O (l)

\frac{y}{100}

y

B r_{2} (l) ⟶ B r_{2} (g)

H_{2} O (s) ⟶ H_{2} O (g)

N_{2} (1 a t m, 100^{\circ} C) ⟶ N_{2} (1 a t m, 150^{\circ} C)

N_{2} (g) + 3 H_{2} (g) ⟶ 2 N H_{3} (g)

C a C O_{3} (s) ⟶ C a O (s) + C O_{2} (g)

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