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30 April, 19:41

The complete combustion of 0.661 g of a snack bar in a calorimeter (Ccal = 6.15 kJ/°C) raises the temperature of the calorimeter by 1.63 °C. Calculate the food value (in Cal/g) for the snack bar.

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  1. 30 April, 20:52
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    The heat calorimeter gained is same amount as the heat which snack bar gave.

    (the heat calorimeter gained) = 6.15 kJ/⁰C * 1.63⁰C = 10.0 kJ

    (the calorie snack bar gave) = (food value) cal/g * 0.661g

    1kJ=10³J

    4.2J=1cal

    (the heat calorimeter gained) = 1.00 * 10⁴J

    (the heat snack bar gave) = (food value) * 0.661 * 4.20 = 2.77 * (food value) J

    (food value) = 3.61cal/g
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