Problem: Standard thermodynamic quantities for selected substances at 25 °C SubstanceΔH ( kJ/mol)Na(s)0.0Na(g)107.5Cl(g)121.3Cl2(g)0.0NaCl(s)-411.2Pb(s)0.0Pb(g)195.2Pb(NO3)2(s)-451.9N(g)472.7N2(g)0.0O(g)249.2O2(g)0.0O3(g)142.7What is the value of ΔH°f  1  mol of m NaCl(s)?

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We are asked what is the value of ΔH°f  for 1  mol of m NaCl(s)

The heat of formation values can be found on standard tables on books. 

The table is already given so we just have to find it. 


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Problem Details

Standard thermodynamic quantities for selected substances at 25 °C 



SubstanceΔH ( kJ/mol)
Na(s)0.0
Na(g)107.5
Cl(g)121.3
Cl2(g)0.0
NaCl(s)-411.2
Pb(s)0.0
Pb(g)195.2
Pb(NO3)2(s)-451.9
N(g)472.7
N2(g)0.0
O(g)249.2
O2(g)0.0
O3(g)142.7




What is the value of ΔH°f  1  mol of m NaCl(s)?

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