03/09/16
CHEM 101 Quiz 4 (15 points)
Name _________________________________
1. (3 points) Hydrazine is compound made up of molecules built of nitrogen and hydrogen atoms as
follows:
(a) Fill the blanks.
Molecular formula of hydrazine
Empirical formula hydrazine
(b) Fill the blanks.
Numeric Value:
Unit:
Molecular weight of hydrazine
Molar mass of hydrazine
Average mass of hydrazine
molecules in grams
2. (3 points) Fill the blanks in the following table.
Bromine
Diamond
Sodium
chloride
The number of molecules in 1.00 mole
The number of atoms in 1.00 mole
The number of elements in 1.00 mole
The number of substances in 1.00 mole
The number of compounds in 1.00 mole
The mass in grams of 1.00 mole
The volume in cm3 of 1.00 mole
PLEASE TURN OVER!!!
3. (3 points) Briefly (in general terms) describe how one can distinguish between Na2CO3 and
K2CO3 samples using the method employed in Experiment 3 “Identification of a Metal
Carbonate”. Outline the measurements that should be taken and calculations that should be
performed based on those measurements to tell the two samples apart.
4. (6 points) 0.487 grams of an organic compound (molar mass is approximately 320 g/mol) is
combusted and found to produce 1.321 g CO2, 0.325 g H2O and 0.0421 g N2. Determine the
empirical and molecular formulas of the compound.