Please show the work. Thank you Formula of a Hydrate Data: Mass of the crucible
ID: 549362 • Letter: P
Question
Please show the work. Thank you
Formula of a Hydrate
Data:
Mass of the crucible and cover 41.430g
Mass of crucible, cover and sample 42.644g
Mass of crucible, cover and salt after first heating 42.405g
Mass of crucible, cover and salt after second heating 42.401g
Calculations:
Chemical formula of anhydrous salt (given) CaSO4
Mass of hydrate (sample) 1.214g
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
Q1.
mass of hydrated salt = (42.644-41.430) = 1.214 g of sample
mass of anhydrous = (42.644-42.401) = 0.243
Q2
mass of water = (1.214 - 0.243) = 0.971 g
Q3
% water in hydrate = mass of water / total mas sof hydrate = 0.971 /1.214 *100 = 79.98 %
Q4
moles of anhydrous = mass/MW = 0.243 / 136.1406 = 0.0017849 mol
Q5
mol of water = mass/MW = 0.971/18 = 0.0539
Q6
moles of water per salt = 0.0539 / 0.0017849 = 30
Formula of hydrate
CaSO4 * 30 H2O