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A piston filled with 0.04 mol of an ideal gas expands reversibly from 50.0 mL to 375 mL at a constant temperature of 37.0°C. As it does so, it absorbs 208J of heat. The values of q and w for the process will be : (R = 8.314 J/mol K) (In 7.5 = 2.01) A) q = + 208 J, w = - 208 J B) q = - 208 J, w = - 208 J C) q = - 208 J, w = + 208 J D) q = + 208 J, w = + 208 J

A
piston filled with 0.04 mol of an ideal gas expands reversibly from
50.0 mL to 375 mL at a constant temperature of 37.0°C. As it does
so, it absorbs 208J of heat. The values of q and w for the process
will be :
(R
= 8.314 J/mol K) (In 7.5 = 2.01)
A) q
= + 208 J, w = - 208 J
B) q
= - 208 J, w = - 208 J
C) q
= - 208 J, w = + 208 J
D) q
= + 208 J, w = + 208 J

Grade:12

2 Answers

Avinash
askIITians Faculty 1241 Points
8 years ago
For isothermal process, ? U = 0

Process is isothermal reversible expansion, hence dE =0

U = 0.

So, Using 1stlaw of thermodynamics

q = -W

or

w = -q = -208 J
Vaibhav saxena
18 Points
5 years ago
For isothermal process, ? U = 0Process is isothermal reversible expansion,hence dE =0U = 0.So, Using 1stlaw of thermodynamicsq = -Worw = -q = -208 J 
so our ans. is q=+280Jand w=-280J

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