Which contains the greatest mass of oxygen: (2.0) mol of formaldehyde ((CH₂O)), (1.5) mol of methanol ((CH₃OH)), or (1.2) mol of acetic acid ((CH₃CO₂H))?
a. (2.0) mol of formaldehyde ((CH₂O)) b. (1.5) mol of methanol ((CH₃OH)) c. (1.2) mol of acetic acid ((CH₃CO₂H)) d. All contain the same mass of oxygen.