Q2 a-d 2. 147.5mL (50z) of Coca Cola & is placed in a calorimeter containing 150
ID: 559056 • Letter: Q
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Q2 a-d
2. 147.5mL (50z) of Coca Cola & is placed in a calorimeter containing 1500g of water at an initial temperature of 25 C. After the completion of the combustion of the Coca Cola8 the temperature of the water rose to 65 C. (a) What is the energy value in kcal of the 5 oz of soda? (b) What is the energy value in kJ? (e) Caleulate the total energy in a 591mL. (2002) bottle in kcal The following table represents the energy expended by a 70.0 kg (154lb) adult Activity Sleeping Sitting Walking Energy kcalVh 60 100 200 (d) How many hours each of sleeping, sitting, walking will the adult male have to do to utilize all the calories in the 20 oz bottle (assuming that no other food is consumed and all activities are done separatelyExplanation / Answer
Final temperature of water= 65 deg.c
Change in the temperature= 65-25= 40 deg.c
Energy value = mass of water* specific heat of water* change in the temperature
Energy value = 1500*4.184*40 joules=251040 joules =251040/1000Kj= 251 Kj
Energy value in cal = 1500*1*40 =60000 Cal= 60000/1000 = 60 Kcal
5 Oz bottle will have energy of 60Kcal
20 Oz will have energy ogf 4*60 =240 Kcal or 251*4= 1004 KJ
energy spent during sleeping= 60 kcal/hr, no of hrs one has to walk= 240/60 = 4 hrs
energy spent during sitting = 100 Kcal/hr, no of hrs one has to sleep= 240/100= 2.4 hrs
energy spent during walking = 200 Cal/hr, time for walking = 240/200= 1.2 hrs
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