A substance, metallic in nature, is to be identified, and heat capacity is one o

Question

A substance, metallic in nature, is to be identified, and heat capacity is one of the clues to its identify. A block of metal weighing 150. g required 38.5 cal to raise its temperature from 22.8 degree C to 26.4 degree C. Calculate the specific heat of the metal and determine if it is the correct alloy. which has a specific heat capacity of 0.0713 cal/g K. How much water at 20 degree C would be necessary to cool a 34.0 g piece of copper (Cu), specific heat 0.0924 cal/g K from 98. 0 degree C to 25.0 degree C?

Explanation / Answer

Q7.

metal....

m = 150 g

Q = 38.5 cal = 161.084 J

dT = 26.4-22.8 = 3.6 °C

find spcefic heat

Q = m*C*dT

C = Q/(m*dT)

C = 38.5/ / (150*3.6) = 0.07129 cal/gK

Q8

find heat for copper:

Qcopper = m*C*(Tf-Ti)

Qcopper = 34*0.0924*(25-98) = -229.3368

so..

for water

Q = 229.3368 cal

Q = m*C*(Tf-Ti)

229.3368 = m*1*(25-20)

m = 229.3368/5

m =45.86736 g of water

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