Combustion of sucrose is used by aerobic organisms for providing energy for the life sustaining processes. If all the capturing of energy from the reaction is done through electrical process (non P-V work) then calculate maximum available energy which can be captured by combustion of 34.2 gm of sucrose
Given: `Delta H_("combustion")` (sucrose)`=-6000kJ mol^(-1)` `DeltaS _("combustion") = 180J//K.mol` and body temperature is 300 K

Options

A. `600 kJ`
B. `594.6 kJ`
C. `5.4 kJ`
D. `605 .4 kJ`

Answer

D

Explanation

No. of moles of sucrose `= (34.2 )/(342) = 0.1 , - (Delta G) _(T,P) = `useful work done by the system
`- Delta G =- DeltaH + T DeltaS = + (600 xx 0.1) + (180 xx 0.1 xx 300)/(1000) = 605.4 kJ`