Question 975: Thermodynamics & KTG

Question

The internal energy change in a system that has absorbed 2 kcal of heat and done 500 J of work is

Accepted Answer

When a quantity Q of heat is supplied to a system it is used to do an amount of work W by the system and to increase the internal energy of the systemÃ¢ÂÂbyÃ¢ÂÂÃ¢ÂÂU :
QÃ¢ÂÂ=Ã¢ÂÂÃ¢ÂÂU + W
Here, Q given in kilo calories is converted into joule.
Therefore Q = 2ÃÂ1000ÃÂ4.2 J = 8400 J
The increase the internal energy
Ã¢ÂÂU = Q Ã¢ÂÂ W = 8400 Ã¢ÂÂ 500 = 7900 J

Answer

6400 J

Answer

5400 J

Answer

7900 J

Answer

8900 J

Thermodynamics & KTG

The internal energy change in a system that has absorbed 2 kcal of heat and done 500 J of work is

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