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A    mass of crucible		24.06 g             	C A    mass of crucible		24.06 g             	C

A mass of crucible 24.06 g C - PowerPoint Presentation

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Uploaded On 2016-05-08

A mass of crucible 24.06 g C - PPT Presentation

B crucible hydrate 2830 g C MN xH 2 O C hydrate B C 424 g MN xH 2 O D final heated hydrate crucible 2636 g C MN E anhydrous salt D A 230 g MN ID: 310425

mol h2o crucible hydrate h2o mol hydrate crucible salt water xh2o anhydrous formula 120 01912 mass heating

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Slide1

A mass of crucible 24.06 g C B crucible + hydrate 28.30 g C + MN . xH2O C hydrate (B – C) 4.24 g MN . xH2O*D final heated hydrate + crucible 26.36 g C + MN E anhydrous salt (D – A) 2.30 g MN F water removed (D – B) or (C – E) 1.94 g H2O / 0.01912 mol *1st heating = 26.42 g, 2nd heating = 26.36 g

DATA TABLE: Formula of a Hydrate

Calculations: Empirical Formula1.94 g H2O = 0.1077 mol H2O 6 H2O 2.30 g MN = 0.01912 mol MN 1 MN

Molar mass of anhydrous salt is 120.3 g/mol identity of salt is magnesium sulfate

1 mol H2O

18 H

2O

1 mol MN

120.3 MN

Formula of this hydrate:

MN

. 6H2O

Percent water = x 100 % = 45.8% water

1.94 g H2O

4.24 g

8.8% error