Thanks Steve.  You know how to explain things perfectly, now it all seems easy!!!

 

Curious where you got the values for  44.01 kJ/mol (this number is the standard DH° for the process H2O(l) --> H2O (g) which should be about right at 0° also. 

 

It is probably in CRC Handbook, right,  but is there a web site you use also?

 

If I used DH° sublimation  that would just equal 44.01  kJ/mol for fusion + the 6.01  kJ/mol for vaporization? Hess' Law?

 

Thanks