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Organic Chemistry

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Phosphoric Acid Chemistry

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Phosphoric acid is an integral part of some of the most important biomolecules in our body.

Reaction 1

image\Ch 31 pass, g1.png

Reaction 1 depicts the conversion of phosphoenol pyruvate to pyruvate.

Phosphate is a part of many high-energy compounds in biological systems. Examples include ATP (adenosine triphosphate)) and GTP (guanosine triphosphate).

image\Ch 31 pass, g2.png

Choose the correct change in free energy in the following conversion. (The products have higher free energy than the reactants)

Adenosine + Phosphate –> AMP

A –14 kJ/mol
B –34 kJ/mol
C +14 kJ/mol
D –40 kJ/mol
Ans. C ATP is a higher energy-currency than AMP. So the hydrolysis of AMP will have a ΔG that is less negative than –31 kJ/mol (given in the passage). Moreover, the conversion represented in the question is the formation of AMP rather than the hydrolysis of AMP. This eliminates Choices B and D. According to the clue given in the question, the products have higher free energy than the reactants. This can give only a positive ΔG.

Phosphoric Acid Chemistry Flashcard List

7 flashcards