Review
1. What laboratory equipment will you use to measure the following quantities?
a) Mass of a wooden block
b) Length of a wooden block
c) Volume of a liquid
2. The mass of an empty graduated cylinder was 15.2 g and mass of the cylinder with sand
in it was found to be 21.5 g. In a water displacement method to find the density of
sand, if initial volume of buret was 2.55 ml and final buret reading was 9.70 ml. The
volume shown with the graduated cylinder was 10.70 ml. Find the density of sand.
3. A KHP solution was prepared by dissolving 0.1441 g of it in 20.0 ml solution. This
solution was titrated with NaOH solution. If 15.5 ml of NaOH were used to reach the
end point, find the molarity of both KHP and NaOH solution.
4. If 15.0 ml of 0 .75 M H2SO4 was needed to reach end point in a titration with 17.0 ml of
NaOH solution. What will be the molarity of NaOH solution.
5. In a lab experiment KI was synthesized by decomposition of KIO3. How many grams of KI will be
produced by 0.1662 g of KIO3. Find the percent yield if actual yield of KI was 0.1125 g.
6. A compound contains 47.08% carbon, 6.59% hydrogen, and 46.33% chlorine by mass. The molar
mass of the compound is 153 g/mol. What are the empirical and molecular formulas of the
compound?
7. What is the concentration of sample that has an absorbance of 0.60?
Concentration (M)
Absorbances
0.20
0.27
0.30
0.41
0.40
0.55
0.50
0.69
Absorbances
0,8
0,6
0,4
0,2
0
0
0,2
0,4
0,6
8. Predict the molecular geometry of following
a) SF6
b) PCl5
c) XeO3
d) O3
9. If a gas is stored at 2 atm pressure in 5 .0 L container, what will be the pressure of gas if it is
transferred to a 7.0 L container?
10. What will be the pressure of a gas in a 250 ml can on a hot summer day, when temperature
outside is 40 0C, if its pressure in winter when temperature was 20 0 C was recorded as 2.5 atm.
11. When solid NaOH (2.5 g ) was dissolved in 100. ml of water, temperature of water changed
from 22 0C to 27 0C. Find the enthalpy of solution in kj/mol for the reaction.