The combustion of Benzoic acid at constant volume is accompanied by an evolution
of 771.5 k cal mort 1.247 g of Benzoic acid at 25°C is burnt in a bomb calorimeter
and showed a temperature rise = 2.870°C. Calculate the total heat capacity of the
calorimeter [Molar mass = 122.12 g mor'
(a) 2400 cal deg
(b) 2745 cal deg
(c) 2975 cal deg
(d) 2225 cal deg
Answers
Explanation:
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11th
Chemistry
Thermodynamics
Enthalpies for Different Types of Reactions
Heat of combustion of benzo...
CHEMISTRY
Heat of combustion of benzoic acid (C
6
H
5
COOH) at constant volume at 25
0
is 3233KJ/mole. When 0.5g of benzoic acid is burnt in bomb calorimeter, the temperature of calorimeter increased by 0.53
0
C. Now in the same bomb calorimeter 1g of C
2
H
6
burnt then temperature increased by 2.04
0
C. △H for combustion of C
2
H
6
is?
HARD
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ANSWER
camb
△H
for C
6
H
5
COOH−3233 k
J
/mol
moles in O Sy=
122
0.5
=
244
1
mol
∴ heat ecvaluted =(
244
1
×3233)kJ
get specific heat for bomb calanmeter be
∴5×0.53
o
=
244
3233
kJ
⇒8=
244×0.53
3233
=25kJ/
o
C
∴ when temp inc. by 2.04
o
C
Heat supplied =2.04×25
=51 kJ
∴54 kJ is released when 1gC
2
H
6
is burnt
,ie
30
1
mol is
∴ for 1 mol, heat is 51×30
1530 k
J
/mol
Explanation:
Thermodynamics chapter
