1)You have a flask of liquid nitrogen at a temperature of -243°C. You then heat
ID: 1329852 • Letter: 1
Question
1)You have a flask of liquid nitrogen at a temperature of -243°C. You then heat the nitrogen until its temperature is doubled. What is the new temperature?
a)-486°C
b) -213°C
c)486°C
d)None of the above
2) An ideal gas in a balloon is kept in thermal equilibrium with its constant-temperature surroundings. How much work is done if the pressure is slowly reduced and the balloon expands to five times its original size? The balloon initially has a pressure of 815.0 Pa and has a volume of 0.70 m3.
-8.0 J
-920 J
-1,000 J
-2,900 J
Explanation / Answer
1)
b) -213 degrees celsius
T1 = -243 + 273 = 30 k
T2 = 2*T1
= 2*30
= 60 k
= 60 - 273
= -213 degrees celsius
2) 920 J
Workdone in an isolthermal process, W = n*R*T*ln(V2/V1)
= P1*V1*ln(V2/V1)
= 815*0.7*ln(5)
= 920 J
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