Question

What is the DeltaH_rxn for the following reaction?

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Answer #1

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

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P4 + 10 CL2 ---> 4 Pcl5 dh = -1207 +4*-157 = -1835 KJ
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