Two friends, Pamela and Elaine, compared snack items they planned to enjoy durin

Question

Two friends, Pamela and Elaine, compared snack items they planned to enjoy during a work break. 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, Carbs 17

(a) Using the fuel values provided, calculate the number of calories in each person's snack. Pamela's snack Cal Elaine's snack Cal

(b) Suppose the friends took a 15-minute walk after snacking. If Pamela burned 43 calories and Elaine expended 48 calories, who had the smaller net gain of calories after snacking and walking?

Explanation / Answer

Given :

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, Carbs 17

You can't convert KJ/g to calories, but you CAN convert KJ/g to calories/g
1 calorie = 4.184 joule = 0.004184 kilo joule
1 joule = 1 / 4.184 calorie = 0.2390 calorie
1000 joule = 1 kilo joule = 239.0 calorie
1 KJ/g = 239.0 calorie/g = 0.2390 kilo calorie/g

1 KJ/g = 239.0 calorie/g

For Pamela’s snacks Nutrient Fuel value as follows :

2.6 grams fat × 38 = 98.8 KJ/g

21 grams carbohydrates ×17 = 357 kJ/g

2.1 grams protein × 17 = 35.7 KJ/g

Total Nutrient Fuel value = 98.8 KJ/g + 357 kJ/g + 35.7 KJ/g = 491.5 KJ/g

1 KJ/g = 239.0 calorie/g

491.5 KJ/g = 117468 calorie/g

491.5 KJ/g = 117.46 Kcalorie/g

For Pamela’s snacks Nutrient Fuel value is 117468 calorie/g.

For Elaine’s snacks Nutrient Fuel value as follows :

2.9 grams fat × 38 = 110.2 KJ/g

31 grams carbohydrates × 17 = 527 KJ/g

3.5 grams protein × 17 = 59.5 KJ/g

Total Nutrient Fuel value = 110.2 KJ/g + 527 kJ/g + 59.5 KJ/g = 696.5 KJ/g

1 KJ/g = 239.0 calorie/g

696.5 KJ/g = 166463.5 calorie/g

696.5 KJ/g = 166.46 Kcalorie/g

For Elaine’s snacks Nutrient Fuel value is 166463.5 calorie/g

(b)15-minute walk after snacking If Pamela burned 43 calories and Elaine expended 48 calories, then Elaine should have smaller net gain of calories after snacking and walking

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