1. A compound is found to have the empirical formula CH. If the molecular weight

Question

1. A compound is found to have the empirical formula CH. If the molecular weight of the compound is 78.11, what is the molecular formula of that compound?

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

3. 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 this information?

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

5. What are hazards associated with magnesium and magnesium oxide?

6. Why would you clean the surface of the magnesium ribbon with steel wool if the magnesium surface is dull?

Explanation / Answer

1)molecular mass=78.11
empirical formula mass (CH)=12+1=13

n = 78.11/ 13 = 6

molecular formula = C6H6

so this is benzene

5)magnesium oxide can effect you when breathed in
breathing mg0 can irritate the eys and nose .

6)To remove the "dirty" oxide layer which slows down the burning reaction. It is a bit like removing the rust (oxide layer) off iron before reacting iron with something.

Most metals, like iron and magnesium, form an oxide with exposure to air, and we call this tarnishing, corrosion, or particularly in the case of iron-based metals - rusting.

Some metals, such as sodium, react so readily with air that we store them under oil or kerosene.

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