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Search 1:40 PM Home I myUVU MyLab and Mastering C à https//session.masteringchemistry.com/myct/itemView?offset next&assignmentProbleml.; d HW#10 ± Nutritional Energy previous 2 of 24 | next» ± Nutritional Energy Alexander, who weighs 183 lb, decides to climb Mt. Krumpett, which is 5340 m high. For his food supply, he decides to take nutrition bars. The label on the bans states that each 100-g bar contains 10 g of fat, 40 g of protein, and 50 g of carbohydrates One gram of fat contains 9 Calories, whereas each gram of protein and carbohydrates contains 4 Calories. Nutrition facts Fat Protein Calories per gram Part A Alexander wants to know exactly how many bars to pack in his backpack for the jouney. To provide a margin of safety, he assumes that he will need as much energy for the return trip as for the uphill climb. How many bars should Alexander pack? Enter the exact answer to two significant figures. Do not round to an integer Hints bars Submit My Answers Give Up Continue

Explanation / Answer

Ans Part A :

Work done = 2mgh

where m is mass in kg , g is gravity , h is height

183 lbs = 83 kg

W = 2 x 83 x 10 x 5340

= 8864400 J or 2118642 cal

calories in 1 nutrition bar = 10(9) + 40(4) + 50(4)

= 450 calories / bar

So the number of bars required = 2118642 / 450

= 4708 bars

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