The efficiency of aerobic respiration is approximately (in $\%$)

How many $ATP$ molecules could maximally be generated from one molecule of glucose,if the complete oxidation of one mole of glucose to $CO_2$ and $H_2O$ yields $686 \ kcal$ and the useful chemical energy available in the high-energy phosphate bond of one mole of $ATP$ is $12 \ kcal$?

Net gain of $ATP$ molecules per hexose during aerobic respiration is

$A-$ $A$ total of $10$ $NADH + H^+$ and $2$ $FADH_2$ molecules are formed in aerobic respiration.
$R-$ One $NADH + H^+$ and $1$ $FADH_2$ are helpful in the formation of $3$ and $2$ $ATP$ molecules respectively.

How many total $ATP$ molecules are synthesized through the aerobic respiration of one molecule of $PGAL$ (in $ATP$)?

If the complete oxidation of one mole of glucose yields $CO_2$ and $H_2O$ with a release of $686 \, Kcal$ of energy,and the energy stored in one mole of $ATP$ as a phosphate bond is $12 \, Kcal$,what is the maximum number of $ATP$ molecules that can be produced from one glucose molecule?