Question

sodium metal reacts violently with water to produce aqueous sodium hydroxide and hydrogen gas. calculate the enthalpy change for this reaction.
Write the equation and balance it.
Look up Hf for the products and reactants.
Then DHrxn = (n*DHfproducts) - (n*DHfreactants)
is it:
Na + H2O -> ????
Hf is hafnium.
i don't know this stuff.
2Na + H2O ==> H2 + 2NaOH
Hf is H<sub>f</sub> = heat formation and hafnium is not involved with anything your are doing.
Look up the delta H<sub>f</sub> values (they should be listed in your text as delta H<sup>o</sub><sub>f</sub> then
follow the equation I gave you. DHf stands for delta H<sup>o</sup><sub>f</sub>.
I made a typo trying to type the sub subscripts and superscripts.
.....should be listed in your text as delta H<sup>o</sup><sub>f</sub> then follow......
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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