3. Chlorophyll is an important pigment that determines the green color of plant leaves. When burning 89.2 mg of chlorophyll in excess oxygen, only the following four substances are obtained: 242 mg of gas, which is usually carbonated drinks; 64.8 mg of the liquid that forms the basis of these drinks; 5.6 mg of gas, which is the most abundant in the earth's atmosphere, and 4.00 mg of white powder, which is the oxide of a light widely used metal that makes up about 2.3% of the earth's crust.
1) What substances are we talking about?
2) Calculate the formula of chlorophyll, given that its molecule contains only one metal atom.
3) Write the equation for the combustion reaction of chlorophyll.
4) Does chlorophyll contain chlorine? Where did the name "chlorophyll" come from?
5) Give an example of a natural substance containing a fragment of a structure of a similar structure.

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