CHM 2045C Module Five
Sample Exam
Part B: Mole/Molecule Calculations 4 points
Calculate the mass in grams of 1.16 x 1022 molecules of nitrogen gas, N2
calculate the number of entities in 0.641 g of oxygen gas, O2
Part
C: Percent Composition 3 points
Calculate the
percent composition of each element in the following compound:
Acetic Acid HC2H3O2
Part
D: Empirical Formula Calculation
4 points
Given the following
percent compositions, determine the empirical formula of the following
compound: 54.5% carbon, 9.15% hydrogen, and 36.3% oxygen