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
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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