The heat capacity at constant volume is the heal capacity at constant pressure.
ID: 949637 • Letter: T
Question
The heat capacity at constant volume is the heal capacity at constant pressure. always higher than always lower than always the same of sometimes higher, sometimes lower than What is the reason for the answer to question 17? At constant volume, part of the incoming heat is lost as work At constant pressure, work is done on the system At constant volume, the change in temperature depends only on the change in internal energy, not on the work At constant pressure, the change in temperature depends only on the heat, not on the work At constant pressure, the change in internal energy is a state function Solve this problem on the back of the scantron sheet. calculation required for credit: a mere answer to the question will receive NO credit.) A certain material's temperature increases by 1.0 DegreeC for every 1560 J that it gains. A 0.1964 g sample of quinone (molar mass - 108.1 g/mole) was bunt, and the surrounding material's temperature increased from 20.3 DegreeC to 23.5 DegreeC. Find the molar heat of reaction for the combustion of quinone.Explanation / Answer
17
B. Always lower.
18.
B. At constant pressure, work is done on the system.
19.
Qmaterial = 1560 J/oC (23.5-20.3) oC = 49 92 J = 5.0 kJ
Note that 1560 J/oC is equivalent to mc from Q = mcDT.
DH = -Q = -5.0 kJ
n = 0.1964g/[108.1 g/mole] = 0.00182 mole
DH/n = -5.0 kJ/0.00182 mole = -2.7 X 103 kJ/mole of quinine
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