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