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