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Assuming ideal behavior, what mass of MgF2 in grams should be added to 141.5g of water to obtain a solution that boils at 101.25C ?

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Assuming ideal behavior, what mass of MgF2 in grams should be added to 141.5g of water to obtain a solution that boils at 101.25C ? For water, Kf=1.86C/m and Kb=0.512C/m

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