Question

4. Consider the following data: Metal Mass (9 Cu Specilic Heat_Wg % Temperature, 0,900 0.285 these two metals are placed in contact, which of the following will take place? Heat will flow from Al to Cu because Al has Heat will flow larger from specific heat. Cu to Al because Cu has Heat will flow from Cu Io larger heat capacity cause Cu is at a higher temperature. Heat will flow from Cu lo Al because Cu has No heat will Ilow In elther larger mass, direction Calculate the amount of heat liberated "C lo 11.8*C The specific heat (In kJ) from 262 of Cu Is 0.385 Jl 9 %C of copper when cools from 87.0oC to 11,8oC. The specific heat of Cu is 0.365 J/g oC

Answer 1

The heat will flow from copper to aluminum because Cu is at higher temperature. The heat liberated is -7.60kJ

When two metals at different temperatures are kept in contact, heat flows from hotter metal to colder metal until thermal equilibrium is reached.

Here Copper is at a temperature of 60 degree Celsius and aluminum is at 40 degree Celsius. Thus, heat will flow from Cu to Al.

In order to calculate the amount of heat liberated following calculations are required.

m1=262 g

T1=87 oC

Cp=0.385 J/g oC

T2=11.8 oC

The heat liberated can be expressed as follows:

Q=mCp(T2-T1)

Q=262 g*0.385 J/goC(11.8-87)oC

Q=-7585 J

=-7.60kJ

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