Answer
$q=849.1\ Btu/lbm$
Work Step by Step
From table A-5E and A-6E:
Inlet ($P_1=500\ psia, x_1=0$): $h_1=449.51.5\ Btu/lbm$
Outlet ($P_2=500\ psia, T_2=600°F$): $h_2=1298.6.2\ Btu/lbm$
$q=h_2-h_1$
$q=849.1\ Btu/lbm$
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