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please answer asap!!! i will thumbs up!!! A certain liquid X has a normal boiling point of 122.30C and a boiling point elevation constant Kb=1.61

please answer asap!!! i will thumbs up!!!
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A certain liquid X has a normal boiling point of 122.30C and a boiling point elevation constant Kb=1.61 " C ' kg mol , A solution is prepared by dissolving some iron(ItI) nitrate (Fe(NO3)3) in 450. g of X. This solution boils at 123.7 "C. Calculate the mass of Fe(NO)3) that was dissolved. Be sure your answer is rounded to the correct number of significiant digits

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