(1 Problem 26: The number of kilocalories in food is determined by calorimetry S
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Question
(1 Problem 26: The number of kilocalories in food is determined by calorimetry Specific heat (c) Substances techniques in which the food is burned and the amount of heat transfer is measured Solids J/kg C kcal/kg. Aluminum 900 0,215 Concrete 840 0.20 Copper 387 0.0924 840 020 Glass Human Body (37 C) 3300 0.83 452 0.108 Iron, steel Liquids Water 4186 1.000 139 Mercury 0.0333 pertta.com How many kilocalories per gram are there in a g peanut if the energy from burning it is transferred to 0.525 kg of water held in a 0.125 kg aluminum cup, causing a S4.5 C temperature increase? Grade Summary Q/m Deductions Potential 94% Submissions sino cos0 tan0 7 8 9 HOME Attempts remaining: cotan0 asin0 acos0 (3 per attempt 1 2 3 detailed view ata no acotano sinh0 cosh0 tanh0 cotanh0 Degrees O Radians vo C. BACKSPACE submit Hint Feedback I give up! Hints: 0% deduction per hint. Hints remaining: Feedback: 1% deduction per feedback.Explanation / Answer
Here
for the peanut
total heat increase , Q = heat needed to raise water + heat needed to aluminium
Q = (0.525 * 1 + 0.125 * 0.215) * 54.9 Kcal
Q = 30.3 kcal
as the peanut is 4.8 gm
kcal per gram = 30.3/4.8
kcal per gram = 6.31 kcal/gm
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