A student is given a sample of red cobalt sulfate hydrate. She weighed the sample in a dry covered crucible and obtained a mass of 25.050 g for the crucible, cover, and sample. Before adding the sample, the crucible and cover weighed 23.422 g. She then heated the crucible to drive off the water of hydration, keeping the crucible at red heat for about 10 minutes with the cover slightly ajar. She then let the crucible cool, and found it had a lower mass; the crucible, cover and contents then weighed 24.321 g. In the process the sample was converted to blue anhydrous CoSo, Show all calculations necessary to answer the following questions. 1. What was the mass of the hydrate sample? g hydrate 2. What is the mass of the anhydrous CoSo,? g CoSO, 3. How much water was driven off? g H,O

A student is given a sample of red cobalt sulfate hydrate. She weighed the sample in a dry covered crucible and obtained a mass of 25.050 g for the crucible, cover, and sample. Before adding the sample, the crucible and cover weighed 23.422 g. She then heated the crucible to drive off the water of hydration, keeping the crucible at red heat for about 10 minutes with the cover slightly ajar. She then let the crucible cool, and found it had a lower mass; the crucible, cover and contents then weighed 24.321 g. In the process the sample was converted to blue anhydrous CoSo, Show all calculations necessary to answer the following questions. 1. What was the mass of the hydrate sample? g hydrate 2. What is the mass of the anhydrous CoSo,? g CoSO, 3. How much water was driven off? g H,O

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Question

A student is given a sample of red cobalt sulfate hydrate. She weighed the sample in a dry covered
crucible and obtained a mass of 25.050 g for the crucible, cover, and sample. Before adding the
sample, the crucible and cover weighed 23.422 g. She then heated the crucible to drive off the
water of hydration, keeping the crucible at red heat for about 10 minutes with the cover slightly
ajar. She then let the crucible cool, and found it had a lower mass; the crucible, cover and contents
then weighed 24.321 g. In the process the sample was converted to blue anhydrous CoSO,. Show
all calculations necessary to answer the following questions.
1. What was the mass of the hydrate sample?
g hydrate
2. What is the mass of the anhydrous CoSO,?
g CoSO,
3. How much water was driven off?
g H,O
61 I

Water of Hydration
4. What is the percentage of water in the hydrate?
mass of water in sample
% water =
mass of hydrate sample
x100
% H¸O
5. How many grams of water would there be in 100.0 g of hydrate? How many moles?
- g H,O;
moles H,O
6. How many grams of CoSo, are there in 100.0 g of hydrate? How many moles? What per-
centage of the hydrate is CoSO,? Convert the mass of CoSo, to moles. The molar mass of
CoSO, is 154.996 g.
g CoSO;
moles CoSO,
% CoSO, in hydrate
7. How many moles of water are present per mole of CoSO,?
moles H,O/moles CoSO,
8. What is the formula of the hydrate?
62

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