A gas is compressed from $\backslash (520\backslash$mathrm$\{$~cm$\}^\{3\}\backslash )$ to $\backslash (200\backslash$mathrm$\{$~cm$\}^\{3\}\backslash )$ at a constant pressure of $500$ kPa $.$ At the same time, $400$ J of heat energy is transferred out of the gas.

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Part A

What is the change in thermal energy of the gas during this process?

Express your answer with the appropriate units.