Chemistry Pre-Lab: Solving for number of moles of crystal water using manganese perchlorat

Sep 24th, 2015
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Question description

  1. Samples of hydrated manganese perchlorate are heated to determine the amount of crystal water: Mn(ClO4)2·nH2O ! Mn(ClO4)2 nH2O Two samples of different weight are studied: a) m (before heating) = 1.629 g ; m (after heating) = 1.142 g b) m (before heating) = 9.048 g ; m (after heating) = 6.645 g For both samples, calculate the number of moles of crystal water per formula unit of manganese perchlorate. Decide which sample is most likely to represent the correct result, and explain what might have gone wrong with the other.

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