Thursday
September 18, 2014

Homework Help: Chemistry

Posted by Alex on Friday, November 8, 2013 at 9:22pm.

I need help I can't seem to get the right answer. Please help!
1/2 H_2 (g) + 1/2 Cl_2 (g) --> HCl (g) -92.3 kJ/mol
Na(s) + 1/2 O_2(g) + 1/2H_2(g) --> NaOH(s) -426.8 kJ/mol
NaCl(s) --> Na(s) + 1/2Cl_2(g) 411.1 kJ/mol
H_2O(l) -->H_2(g) + 1/2O_2(g) 285.8 kJ/mol
HCl(g) --> HCl(aq) -75.2 kJ/mol
NaOH(s) --> NaOH(aq) -41.8 kJ/mol
HCl (aq) + NaOH (aq) --> NaCl (aq) + H_2O (l) -56 kJ/mol

I need the dH for H for NaCl(s) NaCl(aq) kJ/mol
I keep getting -411.1 kJ /mol but it says it's wrong what am I doing wrong?

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