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    Could someone help me with this question please?

    You have been given a 45 g sample of a substance that is either NaI or acetanisole, C9H10O2(both with Mw=150 g mol-1). When this is added to 850 g of water the freezing temperature is found to be –1.31°C. Given that for water KFP=-1.86 K kg mol-1 which compound is this likely to be and why?
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    Add some silver nitrate.

    Stupid question!

    (sorry for not being any help)
 
 
 
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