Rank the following compounds in terms of their theoretical mass percent water. R

Question

Rank the following compounds in terms of their theoretical mass percent water. Rank the compounds from least percentage of water to greatest percentage of water. The compounds are Rank hago owaer to greatest percentage CaCl2 2H20, COCI2 . 6H20, CuSO4 . 5H20, MgSO4 . 7H20, Sr(NO3)2·4H20. SO4. 5H20, coch 6H20, MgS04'7 CaCl2. 2H20, Sr(NO3)2 4H20, CuSO4 5H20, COCI2 6H20, MgSO4 7H20 O COCI2 6H20, CuSO4 5H20, MgSO4 7H20, , Sr(NO3)2. 4H20, CaCl2 2H20 O MgS04 7H20, Sr(NO3)2. 4H20, CaCl2. 2H20, CuSO4 5H20, COCI2 6H20 Sr(NO3)2 4H20, COCI2. 6H20, CuSO4.5H20, CaCl2 2H20, MgSO-7H

Explanation / Answer

(1)

For CaCl2.2H2O, % water = (2*18/147)*100 = 24.49%

For CoCl2.6H2O, % water = (6*18/238)*100 = 45.37%

For CuSO4.5H2O, % water = (5*18/249.7)*100 = 36.04%

For MgSO4.7H2O, % water = (7*18/246.47)*100 = 51.12%

For Sr(NO3)2.4H2O, % water = (4*18/283.7)*100 = 25.37%

So required order is:

CaCl2.2H2O < Sr(NO3)2.4H2O < CuSO4.5H2O < CoCl2.6H2O < MgSO4.7H2O

(2)

This causes the mass change to be erraneously high which will in turn cause the % water to be erraneously high

(3)

This causes the mass change to be erraneously low which will in turn cause the % water to be erraneously low

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