Problem: What is the change in internal energy (in J) of a system that absorbs 0.615 kJ of heat from its surroundings and has 0.247 kcal of work done on it?

FREE Expert Solution

This problem related to the first law of thermodynamics.

Recall that:

  • Heat absorbed by the system adds to the total energy of the system, therefore its sign is positive.
  • Work is also a form of energy. Work done on the system also adds to the total energy of the system, therefore its sign in positive.


We will need the following equation to solve this problem:

<math xmlns="http://www.w3.org/1998/Math/MathML"><mo>&#x2206;</mo><mi>E</mi><mo>&#xA0;</mo><mo>=</mo><mo>&#xA0;</mo><mi>q</mi><mo>&#xA0;</mo><mo>+</mo><mo>&#xA0;</mo><mi>w</mi><mo>&#xA0;</mo><mo>-</mo><mo>-</mo><mo>-</mo><mo>-</mo><mfenced><mn>1</mn></mfenced></math>


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Problem Details

What is the change in internal energy (in J) of a system that absorbs 0.615 kJ of heat from its surroundings and has 0.247 kcal of work done on it?

Frequently Asked Questions

What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Internal Energy concept. You can view video lessons to learn Internal Energy. Or if you need more Internal Energy practice, you can also practice Internal Energy practice problems.

What textbook is this problem found in?

Our data indicates that this problem or a close variation was asked in Chemistry: The Molecular Nature of Matter and Change - Silberberg 8th Edition. You can also practice Chemistry: The Molecular Nature of Matter and Change - Silberberg 8th Edition practice problems.