Prelab            Lab #423-Empirical Formula            Chem-2-Labs WS96

1. A compound is found to have the empirical formula CH. If the molecular weight
of the compound is 52.08, what is the molecular formula of that compound?

2. In the empirical formula experiment, if the Mg starts to burn too rapidly,
smoke is given off. What should be done to control this?

3. In the empirical formula experiment, what visible signs may be used
to indicate that the reaction between Mg and oxygen is complete?

4. Most common fire extinguishers use either water or carbon dioxide. In the event
of a magnesium fire, would these be OK to use? What section of the MSDS
provides details of this information?

5. In the empirical formula experiment, water is added after the initial reaction
with oxygen before reheating. Why? Write a balanced reaction describing this.