The complete combustion of 0.721 g of a snack bar in a calorimeter (ccal = 6.15 kj/°c) raises the temperature of the calorimeter by 1.37 °c. calculate the food value (in cal/g) for the snack bar.

The food value of the snack bar could be calculated by 
Food Value = CcalΔT/m

So, the food value for the snackbar would be

Food value = (6.15 kJ/°C)(1.37°C)/0.721 g = 11.68 kJ/g

Convert kJ to cal (1 kJ = 239 cal)
Food value = 11.68*239 = 2791.52 cal/g

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