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March 4, 2015

March 4, 2015

Posted by **Jenny** on Friday, September 7, 2012 at 3:25am.

Determine the energy required to turn a Na metal atom into a gas phase ion (Na+ (g)).

Ionization energy of Na(g) 499 kJ/mol

Electron affinity of O(g)for2e- 603 kJ/mol

Energy to vaporize Na(s) 109 kJ/mol

O2(g) bond energy 499 kJ/mol

Energy change for the reaction:

2Na(s) + 1/2 O2(g)---> Na2O(s) -416kJ/mol

I think I will use Na(s)-->Na(g) and

Na(g)-->Na+(g)

to solve this problem and this is my answer:

499+(109x2)= 717 kJ/mol

This is my answer.

Please help me out to check my answer and if I did wrong, please help me to show what steps I should do to get the right answer.

Thank you so much.

- chemistry -
**DrBob222**, Friday, September 7, 2012 at 11:57amI would agree with 499 kJ/mol + 109 kJ/mol = ? but I don't know why you multiplied by 2.

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