Exercises: Kilocalories and kilojoules
The label on a can of tuna says that one serving provides 120 kcal. Express that energy in kilojoules using the equivalence $1 \text{ kcal} = 4.184 \text{ kJ}$ and round…
The label on a can of tuna says that one serving provides 120 kcal. Express that energy in kilojoules using the equivalence $1 \text{ kcal} = 4.184 \text{ kJ}$ and round to the nearest unit.
A quesadilla made with a corn tortilla and cheese contains approximately 30 g of carbohydrates, 12 g of protein, and 10 g of lipids. Calculate the total energy content…
A quesadilla made with a corn tortilla and cheese contains approximately 30 g of carbohydrates, 12 g of protein, and 10 g of lipids. Calculate the total energy content in kilocalories using $4 \text{ kcal/g}$ for carbohydrates and proteins and $9 \text{ kcal/g}$ for lipids.
A 40 g granola bar provides 190 kcal and a 150 g apple provides 80 kcal. Calculate the energy per gram of each food in $\text{kcal/g}$ and explain which one is more…
A 40 g granola bar provides 190 kcal and a 150 g apple provides 80 kcal. Calculate the energy per gram of each food in $\text{kcal/g}$ and explain which one is more "energy-dense". Round to two decimal places.
A school meal provides 750 kcal and a 13-year-old teenager needs about 2,200 kcal per day. Calculate what percentage of the daily energy that meal covers, and express…
A school meal provides 750 kcal and a 13-year-old teenager needs about 2,200 kcal per day. Calculate what percentage of the daily energy that meal covers, and express both amounts in kilojoules as well. Is it reasonable for a single meal to cover that fraction of the daily total? Comment on your answer.