Question
Asked Feb 4, 2019
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Determine the total kilojoules in two tablespoons of crunchy peanut butter that contains 6 g of carbohydrate, 17 g of fat, and 9 g of protein.

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Expert Answer

Step 1

Determination of total kilojoules of energy in two tablespoons of crunchy peanut butter:

Given peanut butter has 6 g of carbohydrate, 17 g of fat and 9 g of protein.

Energy obtained from 6 g carbohydrate:

The given mass of carbohydrate in peanut butter is 6 g

Amount of energy obtained from 1 g of carbohydrate is 17 kJ/g.

That is, 1 g carbohydrate = 17 kJ

Multiply the given mass of carbohydrate with a conversion factor (17 kJ/1g) and calculate the energy obtained as follows.

 

 

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Step 2

Energy obtained from 17 g fat:

The given mass of fat in peanut butter is 17 g

Amount of energy obtained from 1 g of fat is 37 kJ/g.

That is, 1 g fat = 37 kJ

Multiply the given mass of fat with a conversion factor (37 kJ/1g) and calculate the energy obtained as follows.

 

 

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Step 3

Energy obtained from 9 g protein:

The given mass of protein in peanut butter is 9 g

Amount of energy obtained from 1 g of protein is 17 kJ/g.

That is, 1 g protein = 17 kJ

Mult...

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