Question 1 Correct Mark 2.00 out of 2.00 You placed a sample of a hydrate of cal

Question

Question 1 Correct Mark 2.00 out of 2.00 You placed a sample of a hydrate of calcium chloride (CaCl2) in a weighed test tube, and weighed the filled test tube Then you heated it until no more water was evolved. After cooling, you weighed the test tube again Mass of empty tube (g) 13.33 Mass of filled tube before heating (g) 18.21 Flag questionMass after cooling (g) 17.0 Calculate the following Mass of hydrate originally taken Answer: 4.88 Question 2 Incorredt Mark 0.00 out of You placed a sample of a hydrate of calcium chloride (CaCl2) in a weighed test tube, and weighed the filled test tube Then you heated it until no more water was evolved. After cooling, you weighed the test tube again Mass of empty tube (g) 13.33 Mass of filled tube before heating (g) 18.21 Mass after cooling (g) 17.0 Calculate the following Mass of water evolved 2.00 Flag question Answer 3.67 Question 3 Incorredt Mark 0.00 out of You placed a sample of a hydrate of calcium chloride (CaCl2) in a weighed test tube, and weighed the filled test tube Then you heated it until no more water was evolved. After cooling, you weighed the test tube again Mass of empty tube (g) 13.33 Mass of filled tube before heating (g) 18.21 1.00 Flag questionMass after cooling (g) 17.0 Calculate the following Mass of anhydrous CaC12 formed Answer: 1.21

Explanation / Answer

2) mass of evovled hydrate,

mass of tube before heating - mass of tube after cooling

18.21 - 17 = 1.21 g of H2O evolved

3) mass of anhydrous CaCl2 = 17 - 13.33 = 3.67 g

4) moles of CaCl2 = 3.67 / 111 = 0.0331 moles

5) moles of H2O = 1.21/18 = 0.0672 moles

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