MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.
1)  Which of the following information items would be most useful in verifying the law of definite proportions? 1) ______
  A)  a number of samples of a pure compound collected from various locations
  B)  the total mass of the products in a series of reactions
  C)  analysis information about two compounds that contain the same elements in different proportions
  D)  the total mass of the reactants in a series of reactions

2)  What is the formula mass of Ba(C2H3O2)2? 2) ______
  A)  306.42 amu
  B)  255.43 amu
  C)  196.38 amu
  D)  392.71 amu

3)  Which of the following compounds has the largest formula mass? 3) ______
  A)  CCl4
  B)  BF3
  C)  NO2
  D)  HCN