Enthalpy Worksheet With Answers Page 4
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1
2
3
4
5
6o
o
4. How many grams of copper can be heated from 22.5
C to 35.0
C by the same quantity
o
o
of heat that can raise the temperature of 145g of H
O from 22.5
C to 35.0
C?
2
Answer
o
o
(145g)(4.180J/g
C) = m(0.385J/g
C)
1574.3g
1.57kg
Bomb Calorimetry
1. A 0.8082g sample of glucose (C
H
O
) is burned in a bomb calorimeter assembly,
6
12
6
o
o
and the temperature is noted to rise from 25.11
C to 27.21
C. Determine the heat
capacity of the bomb calorimeter assembly, given:
C
H
O
+ 6O
6CO
+ 6H
O
6
12
6(s)
2(g)
2(g)
2
(l)
∆H = -2803kJ
Answer
moles of glucose = 0.8082g / 180.2g/mol = 0.00449mol
q = -2803kJ/mol (0.00449mol) = -12.59kJ
o
o
C = q/∆T = 12.59kJ/2.10
C = 6.00kJ/
C
Hess’s Law of Heat Summation
1. Calculate the enthalpy change for the reaction
C
H
+ H
C
H
∆H = ?
2
4(g)
2(g)
2
6(g)
Given:
C
H
+ 3O
2CO
+ 2H
O
2
4(g)
2(g)
2(g)
2
(l)
∆H = -1410.9kJ
2C
H
+ 7O
4CO
+ 6H
O
2
6(g)
2(g)
2(g)
2
(l)
∆H = -3119.4kJ
2H
+ O
2H
O
2(g)
2(g)
2
(l)
∆H = -571.6kJ
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