City College, Chemistry Department
Chemistry 10301, sections L and L2, Prof. T. Lazaridis
Second Midterm exam, Nov. 6, 2001
Name (last name first): ___________________________________
I.D. Number:
____________________________________________
Workshop leader:
________________________________________
Note: There are 7 questions in this exam (check both sides of the sheet).
Fill in your answer in the blank space provided immediately following each
question.
One point will be subtracted every time you report a numerical result
with an incorrect number of significant figures.
The last sheet of this exam
contains information that may or may not be needed to answer these questions.
Useful data:
R=0.0821 atm L/mol K = 8.3145 J/mol K
1.
(20) a. (5) What will we obtain by adding CaCO
3
to water?
(Use information provide on your data sheet)
Solution
Heterogeneous Mixture
(CaCO
3
is insoluble)
b. (5) A chemical analysis reports that a sample of water contains 8
ppm of lead.
How many grams of lead are in one liter of this
water ?
(Density of water: 1g/ml)
8 ppm = x g lead / (1000 ml * 1 g/ml) => x = 0.008 g Pb
c. (5) How many ml of 3.0 M H
2
SO
4
are required to make 450 ml of
0.10 M H
2
SO
4
?
This preview has intentionally blurred sections. Sign up to view the full version.
View Full Document
This is the end of the preview.
Sign up
to
access the rest of the document.
 Spring '11
 SAWYERS
 Chemistry, Sulfuric acid, Sodium hydroxide, Standard enthalpy change of formation

Click to edit the document details