Answer:
a) Pamela's shortbread cookies has 117,471.3 calories = 117.5 kcal
Elaine's popcorn has 166,515.3 calories = 166.5 kcal
b) Pamela had the smaller net gain of calories after snacking and walking.
Step-by-step explanation:
- Pamela's snack was a small bag of shortbread cookies composed of 2.6 grams fat, 21 grams carbohydrates, and 2.1 grams protein.
- Elaine had a bag of popcorn composed of 2.9 grams fat, 31 grams carbohydrates, and 3.5 grams protein.
Nutrient | Fuel value (kJ/g):
Carbohydrate | 17
Fat | 38
Protein | 17
Noting that instead of Carbs, Protein was intended to be written.
a) For Pamela
Carbohydrates = (21 g) × (17 KJ/g) = 357 KJ
Fats = (2.6 g) × (38 KJ/g) = 98.8 KJ
Protein = (2.1 g) × (17 KJ/g) = 35.7 KJ
Total fuel value = 357 + 98.8 + 35.7 = 491.5 KJ = 491,500 J
Note that 1 cal = 4.184 J
491,500 J = (491,500/4.184) = 117,471.3 calories = 117.5 kcal
Carbohydrates = (31 g) × (17 KJ/g) = 527 KJ
Fats = (2.9 g) × (38 KJ/g) = 110.2 KJ
Protein = (3.5 g) × (17 KJ/g) = 59.5 KJ
Total fuel value = 527 + 110.2 + 59.5 = 696.7 KJ
Note that 1 cal = 4.184 J
696,700 J = (696,700/4.184) = 166,515.3 calories = 166.5 kcal
b) Suppose the friends took a 15-minute walk after snacking. If Pamela burned 43 kcal and Elaine expended 48 kcal, who had the smaller net gain of calories after snacking and walking?
Pamela gains 117.5 kcal
And loses 43 kcal
Net gain = 117.5 - 43 = 74.5 kcal
Elaine gains 166.5 kcal
And loses 48 kcal
Net gain = 166.5 - 48 = 118.5 kcal
Pamela had the smaller net gain of calories after snacking and walking.
Hope this Helps!!!