Nut Marshmallow Other Food Mass of the water 50g 50g 50g Food Item Description:
ID: 1035600 • Letter: N
Question
Nut
Marshmallow
Other Food
Mass of the water
50g
50g
50g
Food Item Description:
Nut (Type:Almond)
Marshmallow (Jumbo)
Other Sample (French Fry)
Mass of food, cup, and clamp – initial
29.4g
35.7g
29.6g
Mass of food, cup, and clamp – final
29.3g
35.0g
29.5g
Mass of burned food
0.1g
0.7g
0.1g
Observations of the Flame (intensity, length of time burning, etc.)
Intensity was low and burning was quick reacting as well as quick lived
Intensity of flame very high burned for half minute
When flame occurred, it was high intensity burning was sporadic and short
Water temp – initial (°C)
20 C
20 C
23 C
Water temp – final (°C)
22.0 C
33 C
23.5 C
Change in temp (?T) (°C)
2.0 C
13 C
0.5 C
(Q) Energy Released (kcal/g)
Energy Estimated on Package (kcal/g)
Percent Difference
Determination of Calories according to Atwater Factors (kcal/g)
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Nut
Marshmallow
Other Food
Mass of the water
50g
50g
50g
Explanation / Answer
specific heat of water = 1 cal/g.oC
For nut,
Total mass = 50 + 0.1 g = 50.1 g
dT = 2 oC
Q = mCpdT = 50.1 x 1 x 2/1000 = 0.1002 kcal
Percent difference = 0.1002 x 100/0.78435 = 12.8%
Calories kcal/g = 0.1002 kcal/0.1 g = 1.002 kcal/g
For marshmallow,
Total mass = 50 + 0.7 g = 50.7 g
dT = 13 oC
Q = mCpdT = 50.7 x 1 x 13/1000 = 0.6591 kcal
percent difference = 0.6591 x 100/0.78435 = 84.03%
Calories kcal/g = 0.6591 kcal/0.7 g = 0.94 kcal/g
For other food,
Total mass = 50 + 0.1 g = 50.1 g
dT = 0.5 oC
Q = mCpdT = 50.1 x 1 x 0.5/1000 = 0.02505 kcal
percent difference = 0.02505 x 100/0.78435 = 3.17%
Calories kcal/g = 0.02505 kcal/0.1 g = 0.25 kcal/g
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