The label on a ready-to-eat cereal box indicates that 1 cup contains 32 grams of carbohydrate, 4 grams of protein, and 2 grams of fat. How many kilocalories are there in two cups of this cereal?

324kcal for two cups

Explanation:

Calorie is the unit of food energy. Kilocalorie (Kcal) is a thousand calories. Ideally in a food, Carbohydrates make up for 4calories per gram, proteins make up for 4 calories as well, while fats make up for 9calories per gram.

Hence, according to the question, the cereal box as indicated on the label box, contains 32grams of carbohydrates, 4grams of protein and 2grams of fats.

If 1 gram of carbohydrate produces 4 calories

32 grams of carbohydrate will produce 32 * 4 = 128calories

If 1 gram of protein produces 4 calories

4 grams of protein will produce 4 * 4 = 16 calories

If 1 gram of fat produces 9 calories

2 grams of fat will produce 2 * 9 = 18calories

In total, 128 + 16 + 18 = 162 calories for one cup of the cereal. Hence 2 cups of the cereal will produce 2*162 = 324calories of energy.