Answer
$1.576KJ $
Work Step by Step
We can find the heat absorbed as
$2.25g \space C_3H_8O\times \frac{1 mol\space C_3H_8O}{60.09g\space C_3H_8O}\times\frac{42.1KJ}{1 mol\space C_3H_8O}=1.576KJ $
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