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Corn makes up a large proportion of people's diet in some parts of the world - VCE - SSCE Chemistry - Question 6 - 2022 - Paper 1
Question 6
Corn makes up a large proportion of people's diet in some parts of the world. Air-popped popcorn is made from whole corn kernels. The nutrition content of a particul... show full transcript
Worked Solution & Example Answer:Corn makes up a large proportion of people's diet in some parts of the world - VCE - SSCE Chemistry - Question 6 - 2022 - Paper 1
Step 1
Calculate the energy from Protein
Answer
The energy content from protein can be calculated using the formula:
Energy from protein (kJ) = Protein (g) × Energy value of Protein (kJ/g)
Given the average protein quantity is 10.7 g and the energy value of protein is approximately 17 kJ/g:
Energy from protein = 10.7 g × 17 kJ/g = 181.9 kJ.
Step 2
Calculate the energy from Fat
Answer
The energy content from fat can be calculated using a similar formula:
Energy from fat (kJ) = Fat (g) × Energy value of Fat (kJ/g)
Given the average fat quantity is 5.0 g and the energy value of fat is approximately 37 kJ/g:
Energy from fat = 5.0 g × 37 kJ/g = 185 kJ.
Step 3
Calculate the energy from Carbohydrates
Answer
The energy content from carbohydrates is calculated as follows:
Energy from carbohydrates (kJ) = Carbohydrates (g) × Energy value of Carbohydrates (kJ/g)
Given the average carbohydrates quantity is 78.7 g and the energy value of carbohydrates is approximately 17 kJ/g:
Energy from carbohydrates = 78.7 g × 17 kJ/g = 1337.9 kJ.
Step 4
Total Energy Calculation
Answer
Now, to find the total energy content of 100 g of air-popped popcorn:
Total Energy (kJ) = Energy from protein + Energy from fat + Energy from carbohydrates
Total Energy = 181.9 kJ + 185 kJ + 1337.9 kJ = 1704.8 kJ.
To find the energy content per gram:
Energy per gram (kJ/g) = Total Energy (kJ) / 100 g
Energy per gram = 1704.8 kJ / 100 g = 17.048 kJ/g.