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25 March, 09:37

Calculate the energy provided by a slice of bread containing 2 g of protein, 1 g of fat, and 20 g of carbohydrate. record your answer using whole number.

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  1. 25 March, 09:59
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    The energy provided by equal amounts of carbohydrates and fats are not the same. This means that 1 g of carbohydrates will give out a different value of calories than 1 g of fat.

    Proteins and carbohydrates both give 4 calories per gram,

    Fats give out 9 calories per gram,

    Therefore energy given by each food type is as follows;

    proteins - 2 g x 4 calories/g = 8 calories

    Carbohydrates - 20 g x 4 calories/g = 80 calories

    Fats - 1 g x 9 calories/g = 9 calories

    Total energy - 8+80 + 9 = 97 calories

    1 cal - 4.18 kJ

    Therefore 97 calories - 4.18 kJ/cal x 97 cal = 405 kJ
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