Using the nutrition values for one serving of crackers found above, calculate the energy, in kilojou

The Nutrition Facts label for crackers states that 1 serving contains 19 g of carbohydrate, 4 g of fat, and 2 g of protein.

a.   Using the nutrition values for one serving of crackers found above, calculate the energy, in kilojoules, for each food type. Round off the kilojoules for each food type to the tens place.

b.   What is the total energy, in kilojoules, for one serving of crackers?

Solution:

a)

19 grams \(\times \frac{17\ KJ}{1g}\) = 323 g → 320 g

4 grams \(\times \frac{38\ KJ}{1g}\) = 152 g → 150 g

2 grams \(\times \frac{17\ KJ}{1g}\) = 34 g → 30 g

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b) 320 g + 150 g + 30 g = 500 g