How much heat will be required at constant pressure to form 1-28 kg of CaC2 from CaOs and Cs-Given-rH0CaO-s - -152 kcal-mol-rH0CaC2-s - -14 kcal-mol-rH0CO-g - -26 kcal-mol-

CaO(s) + 3C(s) → CaC_2(s) + CO(g) Δ_fH^0 = ( 14 26) ( 152) = +112 kcal/mol Total heat required = (1280/64) × 112 ⇒ 2240 kcal ...

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Heat of Formation

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Question

How much heat will be required at constant pressure to form $1.28 k g$ of $C a C_{2}$ from $C a O (s)$ and $C (s)$ ?

Given:

$Δ_{r} H^{0} (C a O, s) = - 152 k c a l / m o l$ .

$Δ_{r} H^{0} (C a C_{2}, s) = - 14 k c a l / m o l$ .

$Δ_{r} H^{0} (C O, g) = - 26 k c a l / m o l$ .

22.4 kcal

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224 kcal

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3840 kcal

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2240 kcal

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How much heat will be required at constant pressure to form $1.28 k g$ of $C a C_{2}$ from $C a O (s)$ and $C (s)$ ?

Given:

$Δ_{r} H^{0} (C a O, s) = - 152 k c a l / m o l$ .

$Δ_{r} H^{0} (C a C_{2}, s) = - 14 k c a l / m o l$ .

$Δ_{r} H^{0} (C O, g) = - 26 k c a l / m o l$ .

128 g

C a C_{2}

C a C O_{3}

C a C O_{3} (s) \to C a O (s) + C O_{2} (g); △ H^{o} = 42 .8 kcal

C a O (s) + 3 C (s) \to C a C_{2} (s) + C O (g); △ H^{o} = 111 kcal

C a C_{2}

C a C O_{3}

C a C O_{3} (s) \to C a O (s) + C O_{2} (g); △ H^{o} = 42 .8 k c a l

C a O (s) + 3 C (s) \to C a C_{2} + C O (g); △ H^{o} = 111 k c a l

C_{10} H_{8} (s) + 12 O_{2} (g) \to 10 C O_{2} (g) + 4 H_{2} O (l)

- 1228.2 k c a l

25^{o} C

C (d i a m o n d, s) + O_{2} (g) \to C O_{2} (g); △ H = - 94.3 k c a l

C (g r a p h i t e, s) + O_{2} (g) \to C O_{2} (g); △ H = - 97.6 k c a l

C (d i a m o n d, s) \to C (g r a p h i t e, s)

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