Using the table on the left, calculate the total kilocalories for the meal (rounding off the kilocalories to the tens place).

Question

Express the energy to two significant figures and include the appropriate units
Proteins(g)- 47+14
Carbohydrates(g) - 49+47+76
Fats(g)- 40+13+10

Answer 1

To calculate the total kilocalories for the meal, we need to multiply the grams of each nutrient by its corresponding energy value in kilocalories per gram and then sum up the results.

The energy values for each nutrient are as follows:
- Proteins: 4 kilocalories per gram
- Carbohydrates: 4 kilocalories per gram
- Fats: 9 kilocalories per gram

Let's calculate the kilocalories for each nutrient:

Proteins: (47 + 14) g = 61 g
Total protein kilocalories = 61 g * 4 kcal/g = 244 kcal

Carbohydrates: (49 + 47 + 76) g = 172 g
Total carbohydrate kilocalories = 172 g * 4 kcal/g = 688 kcal

Fats: (40 + 13 + 10) g = 63 g
Total fat kilocalories = 63 g * 9 kcal/g = 567 kcal

Now, let's add up the kilocalories for each nutrient to find the total:

Total kilocalories = Total protein kilocalories + Total carbohydrate kilocalories + Total fat kilocalories
Total kilocalories = 244 kcal + 688 kcal + 567 kcal = 1499 kcal

Therefore, the total kilocalories for the meal is 1499 kcal (rounded to the tens place) or 1.5 × 10^3 kcal (expressed with two significant figures and appropriate units).