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1. Find the molar mass (MM) of the substances.

MM FeSO4 = 151.91g

+MM 7H2O = 126.11g

MM FeSO4 x 7H2O = 278.02g

2. Find the percent water of hydrate.

Divide the mass of water by the mass of the hydrate; multiply result by 100%.

126.11g

278.02g x 100%

Percent water of FeSO4 * 7H2O is 45.36%.

Finding Molar Mass

# atoms Element A x Atomic Mass Element A = Mass A

# atoms Element B x atomic mass Element B = Mass B

... etc.

Add up all the mass values for the substance and you have the molar mass of the substance.

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โˆ™ 11y ago
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โˆ™ 5mo ago

To calculate the percent of water in FeSO4ยท7H2O, you need to consider the molecular weights of each component. The molecular weight of FeSO4 is 151.91 g/mol, and the molecular weight of 7H2O is 126.14 g/mol. The total molecular weight of FeSO4ยท7H2O is 277.05 g/mol. The percent of water in FeSO4ยท7H2O is (126.14/277.05) x 100 = 45.5%.

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