If 157 J of heat is applied to a 84 g sample of mercury, how many degrees will t
ID: 965216 • Letter: I
Question
If 157 J of heat is applied to a 84 g sample of mercury, how many degrees will the temperature of the sample of mercury increase?
mersury=0.14
If 175 J of heat energy is applied to a block of aluminum weighing 28.0 g, by how many degrees will the temperature of the aluminum increase?
Perform the indicated conversions.
(a) 619.7 kJ into kilocalories
kcal
(c) 51.49 kcal into joules
J
(d) 141.6 cal into kilojoules
. kJ
Calculate E for each of the following.
(a) q = -56 kJ, w = +78 kJ
kJ
(b) q = +98 kJ, w = +42 kJ
kJ
(c) q = +49 kJ, w = 0 kJ
kJ
Explanation / Answer
1)
heat Q = 157 J
mass of Hg = 84 g
Cp = 0.14
Q = m Cp dT
157 = 84 x 0.14 x dT
dT = 13.35oC
temperature increases = 13.35 oC
2)
Q = m Cp dT
175 = 28 x 0.9 x dT
dT = 6.94 oC
temperature increase = 6.94 oC
(a) 619.7 kJ into kilocalories
619.7 x 4.18 = 2590.4 kcal
(c) 51.49 kcal into joules
51.49 x 10^3 / 4.18 = 12318 J
(d) 141.6 cal into kilojoules
0.592 kJ
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