The rate of ATP production in a $70kg$ person at rest is approximately $5\mathrm{.}8{10}^{20}$ ATP molecules $\frac{?}{s}.$

a$.$ Assuming all electron flow is from NADH to $O_2,$ calculate the flow rate of electrons through the electron transport chain.

b$.$ Using your results from Part $($a$),$ calculate the rate of energy expenditure in kca$\frac{l}{s}$ and in Watts? Hints: $1W=$ the current of one ampere across a potential of $1$ volt. $1$ ampere $=6\mathrm{.}28{10}^{18}$ charges$/$s$.$

c$.$ The total ATP content in a $70kg$ person at rest is about $50g.$ What is the estimated turnover of an ATP molecule? $($Note: Turnover has units of time.$)$