Which is the least expensive source of enery in kilojoules per dollar, a box of breakfast cereal that weighs 32 ounces and costs $4.23, or a liter of isooctane (density 0.6916 g/ml) that costs $0.45? compare the nutritionl value of the cereal with the heat produced by combustion of the isooctane under standard conditions. a 1.0 -ounce serving of the cereal provides 130 calories

Explanation:

1) 1.0 ounce serving of the cereal provides 130 calories.

Then 32 ounces of breakfast cereal will provide :

=

Cost of 32 ounces of cereal = $4.23

Energy from cereal with respect to dollar:

2) Density of iso-octane = d = 0.6916 g/mL

Mass of the iso-octane = m

Volume of iso-octane = V = 1 L

Moles of isooctane =

Heat of combustion of isooctane = 5450 kJ/mol

Heat released on combustion of 0.006066 moles of isooctane:

1 kJ = 239.006 cal

Cost of 0.6916 g or 1 L of isooctane = $0.45

Energy from isooctane with respect to dollar:

We can generate large amount of energy by combustion of isooctane than the energy we getting from cereal:

17,564.95 cal/$ > 983.45 cal/$

But isooctane is an indigestible by human body so, it will be good to have cereals.

answer: they produce more slow than unicellular organisms.