Question

One cup of kidney beans contains 15 g of protein, 1 g of fat, and 42 g of carbohydrate. How many kilocalories, to two significant figures, does this sample contain?

1) 60 kcal
2) 88 kcal
3) 230 kcal
4) 240 kcal
5) 520 kcal

Answer 1

The cup of kidney beans contains 240 kilocalories, after calculating the energy contribution from protein, carbohydrates, and fat. We used the values of 4 kcal/g for protein and carbohydrates and 9 kcal/g for fat, and summed these values to reach the total.

Step-by-step explanation:

To calculate the total kilocalories in a cup of kidney beans, we need to know the caloric values of protein, carbohydrates, and fat. Using standard nutrition science values:

Now, let's calculate the energy provided by each macronutrient:

Adding these together, we get:

60 kcal (from protein) + 168 kcal (from carbohydrates) + 9 kcal (from fat) = 237 kilocalories.

Rounding to two significant figures gives us 240 kilocalories, which corresponds to option 4 in the choices provided.