Calculate Energy Content for a Food Using Nutrition Facts

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Q1. The Nutrition Facts label for crackers states that 1 serving contains 19 g of carbohydrate, 4 g of fat, and 2 g of protein.

What is the energy from each food type and the total energy, in kilocalories, for one serving of crackers? Round off the kilocalories for each food type to the tens place.

Q2.

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?

[angelapaez]

Jeff- would you mind showing your work for the second problem :(

[unclebotwe]

19x17=323, and
2x17=34, and not 320 and 30 respectively.
Therefore the total energy is 509kj, not 500kj.

[shughlazubair]

PLZ SIR TELL ME HOW THIS 500 KJ COULD BE THE ANS

[mohamedansar]

Hi..it has come 509 kj without rounding off each..

[sivashankar]

Carbohydrates provide 4 calories per gram, protein provides 4 calories per gram, and fat provides 9 calories per gram.
Not Kilocalories.