When your body metabolizes sugar (glucose), 2.8 MJ of heat is produced for every mole of sugar that is burned. How much heat will be released when 0.25 moles of glucose in a can of soda is metabolized? Express your answer in kilojoules (kJ) using the correct number of significant figures.

Respuesta :

Answer: [tex]7.0\times 10^2kJ[/tex]  will be released when 0.25 moles of glucose in a can of soda is metabolized

Explanation:

Heat of combustion is the amount of heat released on complete combustion of 1 mole of substance.

Given :

Amount of heat released on combustion 1 mole of glucose = 2.8 MJ = [tex]2.8\times 10^3kJ[/tex]      [tex]1MJ=10^3kJ[/tex]

Thus we can say:  

1 mole of glucose on combustion releases = [tex]2.8\times 10^6J[/tex]

Thus 0.25 moles of glucose on combustion releases =[tex]\frac{2.8\times 10^3kJ}{1}\times 0.25=7.0\times 10^2kJ[/tex]

Thus [tex]7.0\times 10^2kJ[/tex]  will be released when 0.25 moles of glucose in a can of soda is metabolized