What mass of water (in grams) is needed to dissolve 28.7 g of ammonium nitrate NH4NO3 in order to prepare a 0.452 m (molal) solution?

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  1. Molal is the number of moles per kg of solvent (not solution).

    or molal = moles/(kg of water)

    thus mass needed (in kg) =
    (moles NH4NO3)/0.452

    calculate (moles NH4NO3) from the data in the question then use the expression above to find the kg of water needed. Hence convert kg to g as asked for in the question.

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  2. 793.4 g

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