When a 0.680 g sample of olive oil is burned in a calorimeter, the heat released increases the temperature of 370 g of water from 22.7 ∘c to 38.9 ∘c. what is the energy value of the olive oil in kj/g?

the energy value of the olive oil kJ/g = 36.880 KJ/g

Explanation:

we can calculate energy gained by the water which generated by the reaction from this formula :

Q = mc∆t

where:

m is the mass of water= 370 g

c specific heat of water = 4.184 J/g·°C  

∆t is the change or difference in temperature in °C = 38.9 - 22.7 = 16.2 °C

by substitution:

Q = 370g * 4.184 J/g.°C* 16.2°C

   = 25078.896 Joule

the energy value of the olive oil = Q / mass of olive oil

                                                     = 25078.896 Joule/ 0.68 g

                                                     =36880 J/g

                                                      = 36880 / 1000 = 36.880 KJ/g

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