
the total kilojoules in two tablespoons of crunchy peanut butter that contains 2  g
  of carbohydrate, 15  g
  of fat, and 9  g
  of protein
Express your answer to two significant figures and include the appropriate uni

To calculate the total kilojoules (kJ) in two tablespoons of crunchy peanut butter, we need to consider the energy contribution from carbohydrates, fats, and proteins. The energy values for these macronutrients are:

- Carbohydrates: 16 kJ per gram
- Fats: 37 kJ per gram
- Proteins: 17 kJ per gram

Given:
- Carbohydrates: \(2 \, \text{g}\)
- Fats: \(15 \, \text{g}\)
- Proteins: \(9 \, \text{g}\)

We can calculate the energy contribution from each macronutrient:

\[
\text{Energy from carbohydrates} = 2 \, \text{g} \times 16 \, \frac{\text{kJ}}{\text{g}} = 32 \, \text{kJ}
\]

\[
\text{Energy from fats} = 15 \, \text{g} \times 37 \, \frac{\text{kJ}}{\text{g}} = 555 \, \text{kJ}
\]

\[
\text{Energy from proteins} = 9 \, \text{g} \times 17 \, \frac{\text{kJ}}{\text{g}} = 153 \, \text{kJ}
\]

Now, sum these values to find the total energy:

\[
\text{Total energy} = 32 \, \text{kJ} + 555 \, \text{kJ} + 153 \, \text{kJ} = 740 \, \text{kJ}
\]

To two significant figures, the total energy is:

\[
\text{Total energy} \approx 740 \, \text{kJ}
\]

So, the total kilojoules in two tablespoons of crunchy peanut butter is **740 kJ**.

---

Would you like more details or have any questions? Here are some related questions you might find interesting:

1. How would the energy content change if the fat content were reduced by 5 grams?
2. What is the energy content in kilocalories for the same amount of peanut butter?
3. How many grams of carbohydrates would be required to match the energy provided by 15 grams of fat?
4. How does the energy density of peanut butter compare to other common foods?
5. What percentage of the total energy comes from fats?

**Tip:** Always round your final answer to the correct number of significant figures to match the precision of the given data.

the total kilojoules in two tablespoons of crunchy peanut butter that contains 2 g of carbohydrate, 15 g of fat, and 9 g of protein. Express your answer to two significant figures and include the appropriate unit.

Learn how to calculate the total energy in kilojoules for two tablespoons of peanut butter with 2g of carbohydrates, 15g of fat, and 9g of protein. This guide provides a step-by-step breakdown using basic energy calculations. Suitable for students in Grades 6-8.

Math Problem Statement

Solution

Ask a new question for Free

By Image

Math Problem Analysis

Mathematical Concepts

Formulas

Theorems

Suitable Grade Level

Related Recommendation