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Posted by 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!! - , 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!! - , Tuesday, October 11, 2011 at 3:07pm

    is it:
    Na + H2O -> ????
    Hf is hafnium.
    i don't know this stuff.

  • Chemistry Help!! - , Tuesday, October 11, 2011 at 9:01pm

    2Na + H2O ==> H2 + 2NaOH
    Hf is Hf = heat formation and hafnium is not involved with anything your are doing.
    Look up the delta Hf values (they should be listed in your text as delta Hof then
    follow the equation I gave you. DHf stands for delta Hof.

  • Chemistry Help!! - , 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 Hof then follow......

  • Chemistry Help!! - , 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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