MasteringCheistry: Mastering Assignment 19 Google Chrome Secure https://session.
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MasteringCheistry: Mastering Assignment 19 Google Chrome Secure https://session.masteringchemistry.com/myct/itemView?assignmentProblemID-1005633658offset-next Mastering Assignment 19 Problem 5.92 - Enhanced - with Feedback 13 of 13 Part A A pound of plain M&M; candies contains 96 g fat, 320 g carbohydrate, and 21 g protein. What is the fuel value in kJ in a 41-g (about 1.4 oz) serving? Express your answer using two significant figures. Table 5.5: Compositions and Fuel Values Fuel Value k.J/g kcal/g(Cal/g) Carbohydrate Fat Protein 17 38 17 kJ Submit You may want to reference (Pages 191-192) Section 5.8 while completing this problem. Incorrect. Try Again: 5 attempts remaining To find the total fuel value for 1.4 oz of candies, you need to first find the fuel that carbohydrates, at, and protein each contribute. This can be found by taking the masses given relative to a pound of candies and multiplying it by the appropriate fuel value found in Table 5.5 from the introduction. This will give an approximate fuel value for each. To get this in terms of the desired weight of candies, you can set up a ratio, keeping in mind that 1 lb16 oz. Once cach fuel value for the different compositions has been found, they can be added together to find the total fuel value for 1.4 oz of candies Part B This question will be shown after you complete previous question(s). 2:44 PM 4/2/2018 Type here to searchExplanation / Answer
Solution:- We are asked to calculate the fuel value in kJ in a 41g(1.4 oz) serving.
Let's calculate the energy value for Fat, carbohydrate and protein present in this 1.4 oz serving.
1.4 oz of candie x (1 lb/16 oz) x (96 g fat/1lb candie) x (38 kJ/g fat) = 319.2 kJ
1.4 oz of candie x (1 lb/16 oz) x (320 g carbohydrate/1lb candie) x (17 kJ/1g carbohydrate) = 476 kJ
1.4 oz of candie x (1 lb/16 oz) x (21 g protein/1 lb candie) x (17 kJ/1g protein) = 31.2 kJ
So, the fuel value for 1.4 oz candies = 319.2 kJ + 476 kJ + 31.2 kJ = 826 kJ
For two sig figs it is round off to 830 kJ.