3.) Ethanol has a specific heat of 2.4 J/g K. How much energy is needed to raise

Question

3.) Ethanol has a specific heat of 2.4 J/g K. How much energy is needed to raise 100.0 ml of ethanol from 25.0 °C to 50.0 °C. (d = 0.789 g/ml)

4.) A 12.18 g sample of a metal is heated to 65.00 °C and added to 25.00 g of water in a calorimeter. The water temperature rises from 25.55 °C to 27.25 °C. What is the specific heat capacity of the metal?

5.) A 24.2 g lead slug (c= 0.128 J/g oC) is heated to 200.0 C and dropped into 100.0 ml of water (d = 1.00g/ml; c = 4.184 J/g oC) at 22.0 oC. What is the final temperature of the system?

6.) A 0.500 g of carbon is combusted in a bomb calorimeter. 393.5 kJ/mol of heat is released with respect to carbon. The change in temperature in the calorimeter is 1.75 K.

A. What is q of the reaction?
B. What is the c of the calorimeter in kJ/K?

Explanation / Answer

3.) Ethanol has a specific heat of 2.4 J/g K. How much energy is needed to raise 100.0 ml of ethanol from 25.0 °C to 50.0 °C. (d = 0.789 g/ml)

Q = m*Cp*(Tf-Ti)

m = d*V = 100*0.789 = 78.9 g

Q = 78.9*2.4*(50-25) = 4734 J

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