Saturday
May 23, 2015

Homework Help: Chem

Posted by AY on Thursday, November 4, 2010 at 1:30am.

Part A : This is the first law of thermodynamics question.

case 1 - the system expands and the surroundings get hotter
case 2 - the system expands and the surroundgins get colder
case 3 - the system contracts and the surroundings get hotter
case 4 - the system contracts and the surroundgins get colder

For each case, is the change in internal energy a)Positive b) Negative c) Not enough data

Part B: A gaseous reaction occurs at a constant pressure of 30.0 and releases 57.4 of heat. Before the reaction, the volume of the system was 6.40. After the reaction, the volume of the system was 2.30 .
Calculate the total internal energy change in kilojoules.

I know that that the change in internal energy = q+w

thank you

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