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. all calculations necessary to answer the following questions. In the process the sample was converted to blue anhydrous COSO4. Show 1. 28 1. What was the mass of the hydrate sample? 25.050- 23.122 g hydrate 2. What is the mass of the anhydrous COSO? 24.321 23,422 .8a9 8COSO4 0.729 28-0.5 3. How much water was driven off? g H2O What is the percentage of water in the hydrate? 4. G,729 1.44 28 mass of water in sample 나나. 788 % H2O % water = 100 mass of hydrate sample How many grams of water would there be in 100.0 g of hydrate? How many moles? 5. 16.00 .006 2,18(p 18.010 g H,O; moles H,O 8.014 2.01 58.93 32.00 I.0014) Water of Hyd ration of hydrate? How many moles? What per- 6. How many grams of COSO, are there in 100.0 g of the hydrate is COSO? Convert the mass of COSO, to moles. The molar mass of centage COSO, is 154.996 g. Imol y moles COSO4 IS4.990 g CoSO; 니나 7789 154.a909 44.118 % COSO, in hydrate moles of water are present per mole of COSO? How 7. many moles H,O/moles CoSO4 What is the formula of the hydrate? 8.
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. all calculations necessary to answer the following questions. In the process the sample was converted to blue anhydrous COSO4. Show 1. 28 1. What was the mass of the hydrate sample? 25.050- 23.122 g hydrate 2. What is the mass of the anhydrous COSO? 24.321 23,422 .8a9 8COSO4 0.729 28-0.5 3. How much water was driven off? g H2O What is the percentage of water in the hydrate? 4. G,729 1.44 28 mass of water in sample 나나. 788 % H2O % water = 100 mass of hydrate sample How many grams of water would there be in 100.0 g of hydrate? How many moles? 5. 16.00 .006 2,18(p 18.010 g H,O; moles H,O 8.014 2.01 58.93 32.00 I.0014) Water of Hyd ration of hydrate? How many moles? What per- 6. How many grams of COSO, are there in 100.0 g of the hydrate is COSO? Convert the mass of COSO, to moles. The molar mass of centage COSO, is 154.996 g. Imol y moles COSO4 IS4.990 g CoSO; 니나 7789 154.a909 44.118 % COSO, in hydrate moles of water are present per mole of COSO? How 7. many moles H,O/moles CoSO4 What is the formula of the hydrate? 8.
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Transcribed Image Text: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.
all calculations necessary to answer the following questions.
In the
process the sample was converted to blue anhydrous COSO4. Show
1. 28
1.
What was the mass of the hydrate sample? 25.050- 23.122
g hydrate
2. What is the mass of the anhydrous COSO? 24.321 23,422
.8a9 8COSO4
0.729
28-0.5
3. How much water was driven off?
g H2O
What is the percentage of water in the hydrate?
4.
G,729
1.44 28
mass of water in sample
나나. 788
% H2O
% water =
100
mass of hydrate sample
How many grams of water would there be in 100.0 g of hydrate? How many moles?
5.
16.00
.006
2,18(p
18.010 g H,O;
moles H,O
8.014
Transcribed Image Text:2.01 58.93
32.00
I.0014)
Water of Hyd ration
of hydrate? How many moles? What per-
6. How many grams of COSO, are there in 100.0 g
of the hydrate is COSO? Convert the mass of COSO, to moles. The molar mass of
centage
COSO, is 154.996 g.
Imol
y
moles COSO4
IS4.990 g CoSO;
니나 7789
154.a909
44.118
% COSO, in hydrate
moles of water are present per
mole of COSO?
How
7.
many
moles H,O/moles CoSO4
What is the formula of the hydrate?
8.
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