Question

What is the energy stored in a 100 kCal slice of bread worth in ATP equivalents? (i.e., how many moles of ATP can be formed from ADP and Pi by that amount of energy)

and

Which has more entropy, a solution of olive oil and water or a solution of ethanol and water? Explain your answer.

Answer 1

Q1.

The reaction:

ATP + H2O --> ADP+ H2PO4 + 7.3 kcl/mol ATP

so 1 mol of ATP --> 7.3 kcal

if we had

100 kcal --> 100/7.3 = 13.69863 mol of ATP will be stored

Q2.

olive oil + water --> 2 phases (this is ordered, beautifully 2 layers)

ethanol + water --> 1 phas,e hectic movement of particles (this is more chaos, disorder)

then

by definition

Entropy is higher in the ethanol + water mix