Answer
$Q_{12}=3.74kJ$
Work Step by Step
We can find heat for $1 \rightarrow 2$ as:
$Q_{12}=nC_v(T_1-T_2)$
We plug in the known values to obtain:
$Q_{12}=(1)(\frac{3}{2})(8.31)(600-300)=3739.5J=3.74kJ$
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