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What is the chemical formula of chlorophyll a?

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What is the chemical formula of chlorophyll a?

(a) C45H72MgN4O5

(b) C55H72MgN4O5

(c) C55H72MnN4O5

(d) C45H72MnN4O5

The question was posed to me by my college professor while I was bunking the class.

Question is taken from Chloroplast Structure and Function topic in division Chloroplast Structure and Function of Cell Biology

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The correct choice is (b) C55H72MgN4O5

To explain: The chlorophyll a contains a magnesium ion complex, which forms a ring structure called the Chlorin ring. It has a molar mass of 893.51 g•mol^−1.

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