1a. Determine the quantity of heat that flows from a 25.0g sheet of aluminum foi

Question

1a. Determine the quantity of heat that flows from a 25.0g sheet of aluminum foil as it cools from an oven temperature of 450 degrees Fahrenheit (232 C) to a room temperature of 70 degrees Fahrenheit (21 C) Answer in kilo-joules

b. If all of the heat from the aluminum foil in the part a could be transferred to a 250-mL glass of water at room temperature, what final temperature would the water achieve?

c. What if the heat released from the aluminum in part a was transferred to a 250-mL of liquid ethanol at room temperature? What final temperature would it achieve? How does this compare with water?

Explanation / Answer

Cp of aluminiuym=0.91 KJ/Kg-K

SO Heat transfer Q=0.025*0.91*(232-21)

=4.8 KJ

b.)mass of water=250 gram (density=1000 Kg/m^3)

4.8=0.25*4.18*(T-21)

T=25.59 C ans

c.)density of ethanol=789 kg/m^3

mass of ethanol=197.25 grams

Specific heat of ethanol=2.4 KJ/KG-K

4.8=0.197*2.4*(T-21)

T=31.15 C

Hence temperature of ethanol is higher then of water due to its less mass and specific heat

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