CALCULATIONS Use the mass determined from the last heating and cooling cycle in

Question

CALCULATIONS Use the mass determined from the last heating and cooling cycle in your constant mass calculations. Summarize your calculations in the following table. 0.3416 1. Mass of original ionic hydrate sample 2. Mass of water given off bysample percent of ter infe ionic hydrate 10.0% 3. Mass 0.303 4. Mass of anhydrous compound 5. Chemical formula of anhydrous compound (obtained from instructor) 20 mol 6. Molar mass of anhydrous compound 7. Number of moles of anhydrous cre pound 8. Molar mass of water 0001 males of 9. Number of moles of water given off by sample 10. Ratio of moles of water divided by moles of anhydrous compound 11. Chemical formula of ionic hydrate Show your calculations for steps 3, 7, 9, and 10 below your data table in your lab report.

Explanation / Answer

Step 3

Mass% of water

= mass of water given off x 100/mass of original sample

= 0.0344*100/0.3416

= 10.07%

Step 7

Moles of anhydrous compound = mass/molecular weight

= 0.3072 g/208g/mol

= 0.001477 mol

Step 9

Moles of water = 0.0344/18

= 0.001911 mol

Step 10

Moles of water/moles of anhydrous compound

= 0.001911/0.001477

= 1.2938/1

Chemical formula of hydrate = BaCl2*1.29(H2O)

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