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The heat required to sustain animals to ...

The heat required to sustain animals to hibemate, comes from the biochemical oxidation of fatty acids like arachidonic acid,
`C_(20)H_(32)O_(2)(l) +27O_(2) (g) to 20CO_(2) (g)+16H_(2)O(l)`
The standard molar enthalpy of formation of the acid is -636 kJ/mole. If `C(s)+O_(2)(g) to CO_(2)(l), triangle_(f)H^(@)" =-393.5 kJ/mole and "2H_(2)(g) + O_(2)(g)to 2H_(2)O, triangle_(r)H^(@) "=-571.6 kJ/mole"` then calculate the mass of arachidonic acid needed to wam a 500 kg bear from `5^(@)C" to "25^@C.` Assume that the average heat capacity of bear flesh is `4.18" Jg^(-1) K^(-1)`.

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