how much of calcium is obtained from 75g from calcium sulphate
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11th
Chemistry
Some Basic Concepts of Chemistry
Stoichiometry and Stoichiometric Calculations
3.40 g of CaSO4 (MW = 136 g...
CHEMISTRY
3.40 g of CaSO
4
(MW=136 g/mol) is formed when 4.30 g of hydrated calcium sulphate heated to a constant mass. How many moles of water of crystallisation are combined with each mole of calcium sulphate?
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ANSWER
CaSO
4
=
136
3.40
=0.025 mole
Mass of H
2
O= mass of hydrated salt - mass of anhydrous salt
=4.30−3.40
=0.90 g
n
H
2
O
=
18
0−90
=0.05 mole
0.025 mole CaSO
4
→0.05 mole H
2
O
∴1 mole CaSO
4
→
0.025
0.05
=2 mole H
2
O
Formula of hydrated CaSO
4
is CaSO
4
.2H
2
O
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