11/15/2017 24) QID: 21415 Thinkwell | Fall 2017-Homework assignment #11 Thermoch

Question

11/15/2017 24) QID: 21415 Thinkwell | Fall 2017-Homework assignment #11 Thermochemistry If 478.5 joules of heat are added to a 10.0 g container of 19.7 ethanol (specific heat capacity 2.43 J/g°C), by how many degrees would the temperature increase? o.0510°C 116°C 1.97°C 25) QID: 100854 A calorimeter contains 75.0 g of water at an initial temperature of 25.2 151.28 g of copper metal at a temperature of 95.5 °C was placed in the calorimeter. The equilibrium temperature was 36.2 °C. The molar heat capacity of water is 75.4 J/mol °C. Determine the molar heat capacity of the copper 0.0408 J/mol °C -0.0408 J/mol °C 232 J /mol °C 24.5 J /mol °C

Explanation / Answer

Q24

Q = 478.5

m = 10 g of ethanol CP 0 2.43 J/C

find °C increase

Q = m*C*(dT)

dT = Q/(m*C)

dT = 478.5 / (10*2.43)

dT = 19.69 ° Cincrease

Q25.

-Qmetal = Qwater

-m*C*(Tf-Tmetal) = mw*Cpw*(Tf-tw)

-151.28*Cp*(36.2-95.5) = 75*4.184*(36.2-25.2)

Cp = 75*4.184*(36.2-25.2) /(-151.28) / (36.2-95.5)

Cp = 0.3847J/gC

change to molar

Cp = 0.3847 J/gC* 63.5 g/mol = 24.42 J/molK

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