Question

question 24
4 pts
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.)
237 kcal
230 kcal
88 kcal

1. kcal

Explanation:

Step1: Calculate calories from protein

Multiply protein mass by its caloric - value.
$15\ g\times4\ kcal/g = 60\ kcal$

Step2: Calculate calories from fat

Multiply fat mass by its caloric - value.
$1\ g\times9\ kcal/g=9\ kcal$

Step3: Calculate calories from carbohydrate

Multiply carbohydrate mass by its caloric - value.
$42\ g\times4\ kcal/g = 168\ kcal$

Step4: Calculate total calories

Sum up calories from all components.
$60\ kcal + 9\ kcal+168\ kcal=237\ kcal$
Round to two significant figures: $237\ kcal\approx230\ kcal$

Answer:

230 kcal