Crime Scene 2 - Coffee Break

At this crime scene you will investigate the the scene of the crime where a coffee break took place. Using the clues on the items left at the crime scene, determine what amounts of the various substances were found.

1. Traces of a substance are found in the coffee cup. An analysis shows that the ratio of carbon atoms to hydrogen atoms to oxygen atoms in a molecule is 2 to 3 to 1. What is the molecular formula of this substance found on the coffee cup?

2. A suspicious substance in a beaker; its molecular mass is 206 g/mol. What is the molecular formula of the compound?

3. Examine the lab report at this crime scene. If styrene has a molar mass of 104 g/mol what is the molecular formula for styrene?

4. Examine the plastic container at the crime scene. How many molecules is this?