One ATP molecule's hydrolysis releases 7.3 kcal/mol of energy (∆G = - 7.3 kcal/mol of energy). If it takes 2.1 kcal/mol of energy to move one Na + across the membrane (∆G = + 2.1 kcal/mol of energy), how many sodium ions could one ATP molecule's hydrolysis move?

Question

Chemistry

Ryleigh Woodward

27 April, 23:39

One ATP molecule's hydrolysis releases 7.3 kcal/mol of energy (∆G = - 7.3 kcal/mol of energy). If it takes 2.1 kcal/mol of energy to move one Na + across the membrane (∆G = + 2.1 kcal/mol of energy), how many sodium ions could one ATP molecule's hydrolysis move?

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Answers (1)

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Natalia Melendez · Answer 1

One ATP molecule's hydrolysis can move 3 ions of Sodium (Na+) across the menbrane.

Explanation:

As you can see, the energy provided by ATP is enough for moving 3 ions of Na+. Each ion needs + 2.1 kcal/mol of energy.

If we multiply by 3 the energy for moving across the membrane = + 6.3 kcal/mol

By adding the energy from ATP:

ΔGTotal=6.3-7.3 = - 1 kcal/mol