Homework Help: Chemistry Help!!

Posted by Maci on Tuesday, October 11, 2011 at 2:34pm.

sodium metal reacts violently with water to produce aqueous sodium hydroxide and hydrogen gas. calculate the enthalpy change for this reaction.

Chemistry Help!! - DrBob222, Tuesday, October 11, 2011 at 3:01pm
Write the equation and balance it.
Look up Hf for the products and reactants.
Then DHrxn = (n*DHfproducts) - (n*DHfreactants)
Chemistry Help!! - Maci, Tuesday, October 11, 2011 at 3:07pm
is it:
Na + H2O -> ????
Hf is hafnium.
i don't know this stuff.
Chemistry Help!! - DrBob222, Tuesday, October 11, 2011 at 9:01pm
2Na + H2O ==> H2 + 2NaOH
Hf is H_f = heat formation and hafnium is not involved with anything your are doing.
Look up the delta H_f values (they should be listed in your text as delta H^{o_f then

follow the equation I gave you. DHf stands for delta H^o_f.}
Chemistry Help!! - DrBob222, Tuesday, October 11, 2011 at 9:04pm
I made a typo trying to type the sub subscripts and superscripts.
.....should be listed in your text as delta H^o_f then follow......
Chemistry Help!! - Maci, Wednesday, October 12, 2011 at 1:25pm
i balanced the equation:
2 Na + 2 H2O = H2 + 2 NaOH.
What delta Hf value am i suppose to look up?

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