Homework Answers
1.
2H2 + O2 ----> 2H2O
dhRXN = (2*436+495) - (2*463) = -441 Kj
2.
2CH3OH + 3O2 ---> 2CO2 + 4H2O
DHrxn = (4*-285.8)+(2*-393.5) - (3*0+2*-238.6) = -1453 kj
3.
P4 + 10 CL2 ---> 4 Pcl5 DHrxn =
4*(pcl5 ---> pcl3 + cl2 ) dhrXN = 4*-157
P4 + 6CL2 ---> 4 PCL3 dhRXN = -1207
--------------------------------------------
P4 + 10 CL2 ---> 4 Pcl5 dh = -1207 +4*-157 = -1835
KJ
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