Answer
$c_m=26.2\frac{J}{mol.K}$
Work Step by Step
We know that;
$c_m=\frac{Q}{N(T_f-T_i)}$
We plug in the known values to obtain:
$c_m=\frac{314}{0.6(45-25)}=26.2\frac{J}{mol.K}$
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