The following data were collected from the gravimetric analysis of a hydrated sa

Question

The following data were collected from the gravimetric analysis of a hydrated salt: Complete the following table. (See Report sheet see Data Analysis C, D for determining the standard deviation and relative standard deviation for a set of data. Express all of the calculated data with the correct number of significant figures (see Data Analysis A). Calculations Mass of hydrated salt (g) ___. Mass of anhydrous salt (g) ___ Mass of water lost (g)___ Percent by mass of volatile water in hydrated salt (%) ____ Average percent H_2O in hydrated salt (%H_2O) ___Data Analysis, B Standard deviation of %H_2O____Data Analysis, C Relative standard deviation of % H_2O in hydrated salt (%RSD) ____ Data Analysis, D a. What is the percent by mass of water in iron(II) sulfate heptahydrate, FeSO_4 middot 7H_2O (or what percent of the molar mass of FeSO_4 middot 7H_2O is due to the waters of crystallization)? b. What mass due waters of crystallization is present in a 3.38 g sample of FeSO_4 middot 7H_2O? Percent water in a Hydrated Salt

Explanation / Answer

Question 7

. What is the percent by mass of water in iron(II) sulfate heptahydrate, FeSO4*7H2O?

% by mass H2= (mass of water/mass of hydrate) x 100

FeSO4 x 7H2O

Mass of H2O: =18 x 7 = 126

Mass of FeSO4:= 278

=126/278 x 100 = 45% H2O

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What mass due to waters of crystallization is present in a 3.38-g sample of FeSO4*7H2O?

= (3.38/278) x126g =1.5319g water.

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