Please show the work. Thank you Formula of a Hydrate Data: Mass of the crucible
ID: 549330 • Letter: P
Question
Please show the work. Thank you
Formula of a Hydrate
Data:
Mass of the crucible and cover 51.729g
Mass of crucible, cover and sample 52.388g
Mass of crucible, cover and salt after first heating 52.258g
Mass of crucible, cover and salt after second heating 52.254g
Calculations:
Chemical formula of anhydrous salt (given) CaSO4
Mass of hydrate (sample) 0.659g
Mass of anhydrous salt ______ ?
Mass of water liberated ______ ?
Percentage H2O in the hydrate ______ ?
Moles of anhydrous salt in the hydrate ______ ?
Moles of water in 100g of hydrate ______ ?
Moles of water in 100g of hydrate ______ ?
Moles of water per mole of anhydrous salt ______ ?
Average Moles of water per mole of anhydrous salt ______ ?
Formula of the Hydrate ______ ?
Explanation / Answer
Mass of anhydrous salt = 52.388 - 52.254 = 0.134 gm
Mass of water liberated = 0.134 gm
Moles of water = 0.134 /18 = 0.007444 Moles
Moles of CaSO4 is present = 0.659 /136.1406 = 0.00484 Moles
(Molar mass of CaSO4 is 136.1406 g/mol)
Percentage H2O in the hydrate = 0.134 x 100 / 0.659 = 20.33 %
Moles of water in 100g of hydrate = 0.007444 x 100 / 0.659 = 1.129 Moles
Moles of water per mole of anhydrous salt = 0.007444 / 0.00484 = 1.5
Average Moles of water per mole of anhydrous salt = 1.5
Formula of the Hydrate = (CuSO4)2. 3H2O