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9 September, 09:14

A 0.50 g sample of vegetable oil gives out 19.9 kJ of heat when burned. What is the caloric value of the oil in kcal/g?

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  1. 9 September, 09:25
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    Answer is 9.51 kCal/g

    Explanation;

    1 kJ = 1000 J

    1 J = 0.239 Cal

    Hence,

    19.9 kJ = 19900 J

    19900 J = (0.239 Cal / 1 J) x 19900 J

    = 4756.1 Cal

    1000 Cal = 1 kCal

    Hence, 4756.1 Cal = 4.7561 kCal

    Those calories are in 0.50 g of vegetable oil.

    Hence, to find out the caloric value of the oil in kCal/g, we have to divide amount of Kcal by mass of the oil.

    Then,

    caloric value of the oil = heat burned / mass

    = 4.7561 kCal / 0.50 g

    = 9.5122 kCal/g

    = 9.51 kCal/g
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