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A gas expands and does $P$ - $V$ work on the surroundings equal to $325 \mathrm{J}$. At the same time, it absorbs $127 \mathrm{J}$ of heat from the surroundings. Calculate the change in energy of the gas.

$-198 \mathrm{J}$

Chemistry 101

Chapter 6

Thermochemistry

Rice University

Drexel University

University of Maryland - University College

Lectures

05:27

In chemistry, a chemical reaction is a process that leads to the transformation of one set of chemical substances to another. Both reactants and products are involved in the chemical reactions.

06:42

In chemistry, energy is what is required to bring about a chemical reaction. The total energy of a system is the sum of the potential energy of its constituent particles and the kinetic energy of these particles. Chemical energy, also called bond energy, is the potential energy stored in the chemical bonds of a substance. Chemical energy is released when a bond is broken during chemical reactions.

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this problem. We're focusing on a gas expansion for this problem. We're told that gas does 325 jewels work on the surroundings. So the system is expending energy to do work on the surroundings. It's losing energies. That's why this number is negative. We're also told that the system gains heat from the surroundings. If you're gaining heat that's positive. You're adding energy to the system. So now where? Then? We're also told we need to find the change in internal energy of our gas and in this case or gas is our system. So of course, if you follow the usual formula, the change in internal energy is equal to the work plus the heat. We know that the change internal energy of our system is equal to negative 325 jewels plus 127 jewels, which we know will be equal to 100 negative 198 jewels. So we also because of this, we know that our system is overall losing energy because this number is negative. That means it's expending energy

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