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3. Another way to calculate the number of waters hydrated to an ionic compound is through it's precent composition. An unknown aluminum sulfate hydrate has the formula Al2(SO4)3 ZH2O. If the entire compound is 8.10% Al by mass, calculate the Z value, or how many water molecules are associated with the aluminum sulfate.

3. Another way to calculate the number of waters hydrated to an ionic compound is through it's precent composition. An unknown aluminum sulfate hydrate has the formula Al2(SO4)3 ZH2O. If the entire compound is 8.10% Al by mass, calculate the Z value, or how many water molecules are associated with the aluminum sulfate.

Chemistry
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
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3. Another way to calculate the number of waters hydrated to an ionic compound is through it's precent composition. An unknown aluminum sulfate hydrate has the formula Al2(SO4)3 ZH20. If the entire compound is 8.10% Al by mass, calculate the Z value, or how many water molecules are associated with the aluminum sulfate.
Transcribed Image Text:3. Another way to calculate the number of waters hydrated to an ionic compound is through it's precent composition. An unknown aluminum sulfate hydrate has the formula Al2(SO4)3 ZH20. If the entire compound is 8.10% Al by mass, calculate the Z value, or how many water molecules are associated with the aluminum sulfate.
Expert Solution
Step 1

Molecular weight of Al2(SO4)3.ZH2O = 27x2 + (32+16x4)x3 +Z x (2x1+16)

                                                           = 54 + (96x3) + Zx18 = 342+18Z

Now mass % of Al = 8.1 (given)

Or, 

(54 / (342+18Z)) X 100 = 8.1

So, 

Z= 18

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