Question

When 0.670g sample of olive oil is burned in a calorimeter, the heat released increases the temperature of 370g of water from 22.7 °C to 39.1 °C, what is the energy value of the olive oil in kcal/g?

Answer 1

Mass of olive oil burned = 0.670 g

Mass of water = 370 g

Temperature change of water =
`39.1^(0)C-22.7^(0)C=16.4^(0)C`

Heat absorbed by water = Heat liberated by burning of olive oil

Calculating the heat absorbed by water:

`q = mC(deltaT)`

q =
`(370g)(4.184(J)/(g^(0)C ) (16.4^(0)C) =25388.5 J`

Heat released by burning of olive oil = 25388.5 J

Energy value of olive oil=
`(25388.5 J)/(0.670g) *(1kcal)/(4184J)=9.06kcal/g`