Sol.
AsTotal Kilocalories of ground beef sample = 485 Kcal
Total Mass of sample = 5 oz = 5 × 28.35 g = 141.75 g
Also , sample conatins 21 % protein by mass
So , Mass of protein in sample
= 21 % of Total Mass of sample
= 21 × 141.75 g / 100
= 29.7675 g
As Calorific value of protein = 4 Kcal / g
So , Kilocalories come from protein
= 29.7675 g × 4Kcal / g = 119.07 Kcal
Therefore , Kilocalories come from fat
= Total Kilocalories of sample - Kilocalories come from protein
= 485 Kcal - 119.07 Kcal
= 365.93 Kcal
Now , Calorific value of fat = 9 Kcal / g
So , Mass of fat in sample
= 365.93 Kcal / 9 Kcal / g
= 40.6589 g
Therefore , Percent fat by mass in the sample
= ( Mass of fat in sample / Total Mass of sample ) × 100
= ( 40.6589 g / 141.75 g ) × 100
= 28.68 %
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