How much heat will be required to make 2kg of calcium carbide CaC2 according to the following reaction- CaOs-3Cs- CaC2-COgThe heats of formation of CaOs-CaC2s and COg are -151-6-14-2-26-4kcal respectively-

Δ H=∑Δ H _ f(products) ^ o ∑Δ H _ f(reactants) ^ o =[ Δ H _ (Ca C _ 2 ) ^ o +4Δ H _ (CO) ^ o ] [ Δ H _ (CaO) ^ o +2Δ H _ (C) ^ o ] [ 14.2 26.4 ...

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Standard XII

Chemistry

Heat of Reaction

How much heat...

Question

How much heat will be required to make $2 k g$ of calcium carbide $(C a C_{2})$ according to the following reaction?
$C a O (s) + 3 C (s) \to C a C_{2} + C O (g)$
The heats of formation of $C a O (s), C a C_{2} (s)$ and $C O (g)$ are $- 151.6, - 14.2, - 26.4 k c a l$ respectively.

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Solution

$Δ H = \sum {Δ H}_{f (p r o d u c t s)}^{o} - \sum {Δ H}_{f (r e a c t a n t s)}^{o}$
$= [Δ H_{(C a C_{2})}^{o} + 4 Δ H_{(C O)}^{o}] - [Δ H_{(C a O)}^{o} + 2 Δ H_{(C)}^{o}]$
$[- 14.2 - 26.4] - [- 151.6 + 3 \times 0]$
$= - 111.0 k c a l$
For formation o f $64 g$ of $C a C_{2}$ $111.0 k c a l$ of heat is required.
So, heat required for making $2000 g$ of
$C a C_{2} = \frac{111.0}{64} \times 2000 = 3468.75 k c a l$

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Similar questions

Q. What is the amount of heat to be supplied to prepare 128 g of

C a C_{2}

by using

C a C O_{3}

and followed by reaction with carbon. Reactions are:

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

Q. Calcium carbide is made in an electric-furnace by the reaction given below:

C a O + 3 C ⟶ C a C_{2} + C O

The crude product is usually

85 %

C a C_{2}

and

15 %

unreacted

C a O

.
How much

C a C_{2}

would this crude product contain?

[Given atomic mass of

C a = 40

amu,

C = 12

amu,

O = 16

amu]

C a C_{2} + H_{2} O \to C a O + H C \equiv C H

n (C H \equiv C H) + n H_{2} \to - (C H_{2} - C H_{2})_{n} -

Polyethylene can be produced from calcium carbide according to the given sequence of reactions.
The mass of polyethylene that can be produced from

20.0

kg of pure

C a C_{2}

is :

Q. Calcium carbide is made in an electric furnace by the reaction:

C a O + 3 C ⟶ C a C_{2} + C O

The crude product is usually

85 %

C a C_{2}

and

15 %

unreacted

C a O

.
(a)The amount of

C a O

with which we should start to produce

450

kg of crude product is

x

kg.
(b) Amount of

C a C_{2}

which this crude product will contain is

y

kg.
The value of

x + y

in a nearest integer is :

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:

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

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

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

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How much heat will be required to make 2kg of calcium carbide (CaC2) according to the following reaction?CaO(s)+3C(s)→CaC2+CO(g)The heats of formation of CaO(s),CaC2(s) and CO(g) are −151.6,−14.2,−26.4kcal respectively.

ΔH=∑ΔHof(products)−∑ΔHof(reactants)=[ΔHo(CaC2)+4ΔHo(CO)]−[ΔHo(CaO)+2ΔHo(C)][−14.2−26.4]−[−151.6+3×0]=−111.0kcalFor formation o f64g of CaC2 111.0kcal of heat is required. So, heat required for making 2000g of CaC2=111.064×2000=3468.75kcal

How much heat will be required to make $2 k g$ of calcium carbide $(C a C_{2})$ according to the following reaction?
$C a O (s) + 3 C (s) \to C a C_{2} + C O (g)$
The heats of formation of $C a O (s), C a C_{2} (s)$ and $C O (g)$ are $- 151.6, - 14.2, - 26.4 k c a l$ respectively.