If you had 0.681 moles of CaSO_4 middot 2H_2 O, how many moles of H_2 O would yo

Question

If you had 0.681 moles of CaSO_4 middot 2H_2 O, how many moles of H_2 O would you have? You have a 1.00 g sample of a hydrate of Na_2 CO_3. By heating the compound, you drive off the water and are left with 0.3704 g of the anhydrous compound. What mass of water has been driven off? What is the % by mass of Na_2 CO_3 in the hydrate? What is the % by mass of water in the hydrate? If you had started with 1.623 g of the hydrate, what mass of water would you expect to lose upon heating? Borax (a laundry additive you can buy in the grocery store) is a hydrated sodium tetraborate compound and contains 47.24% water by mass. If you have 15.00 g of borax, how many grams of water are present in the sample? Name the following hydrates

Explanation / Answer

2

a. mass of water driven off = 1 - 0.374 = 0.626 grams

b . percentbymass of Na2CO3 = 0.626/1*100 = 62.6%

C. percentbymass of WATER = 100 -62.6 = 37.04%

D. mass of water driven = 1.623*37.04/100 = 0.601 grams

3. mass of water present in sample = 15*47.24/100 = 7.086 grams

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