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? (the caloric values are: 4 kcal/g for carbohydrate, 9 kcal/g for fat, and 4 kcal/g for protein.)

Answer 1

One cup of kidney beans with 15 g of protein, 1 g of fat, and 42 g of carbohydrate contains approximately 237 kilocalories, when calculated using the given caloric values for each macronutrient.

Step-by-step explanation:

To calculate the number of kilocalories in a cup of kidney beans that contains 15 g of protein, 1 g of fat, and 42 g of carbohydrate, we can use the given caloric values of 4 kcal/g for carbohydrates, 4 kcal/g for protein, and 9 kcal/g for fat.

The total kilocalories can be calculated as follows:

• Carbohydrate kilocalories = 42 g × 4 kcal/g = 168 kcal
• Protein kilocalories = 15 g × 4 kcal/g = 60 kcal
• Fat kilocalories = 1 g × 9 kcal/g = 9 kcal

Adding these together gives:

168 kcal from carbohydrates + 60 kcal from protein + 9 kcal from fat = 237 kilocalories in total.

Therefore, one cup of kidney beans contains approximately 237 kilocalories, to two significant figures.

Answer 2

we need to get the total calories, we can get it by getting the average of calories of the protein, fat, and carbohydrates:
calories of protein = 15g x 4 KCal/g
= 60 KCal
calories of fat = 1 g x 9 KCal/g
= 9 kCal
calories of carbohydrates = 42 g x 4 KCal/g
= 168 Kcal
∴ the total calories = 60 + 9 + 168 = 237Kcal = 0.237 Cal
to get the resualt to two significant figures
∴ the resault is = 0.24 Cal = 240 KCal