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Easy chemistry question?

Posted in: enart.nnmj.com Date: March 11th, 2010

  • i feel really stupid that im unable to answer this question because i think im overthinking it

    calculate enthalpy change for melting of a 30g ice cube?


  • umm I think this is how you should go about it.

    So, I think they mean that the inital temperature is 0 C, and final T is also ) C. if it was different, you also have to calculate heat to increase the temperature.

    1- find the number of moles of 30 g of water.
    2- write your equation like this
    H2O (s) -----> H2O (l) and look up the enthalpy.

    then multiple your number of moles by the enthalpy,since the looked up value is in _kj/MOL.

    so something like this:
    x mol * y kj/mol.

    the moles cancel out and you are left with energy,

    cheers :)







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