Question 5 A gas heated and it absorbs 100 kJ of heat. It expand doing 25 kJ of

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Question 5 A gas heated and it absorbs 100 kJ of heat. It expand doing 25 kJ of work. Wh at is the internal energy change of the gas? Question 6 Calculate the standard enthalpy of formation of propane, C,H (g), given that AH°fTCO2(g)]--394 kJ/mol and 1°f[H2O(l)]--242 kJ/mol, and the following thermochemical equation CH,(g) + 50(g) 3C0(g) + 4H0(g) 2044 kJ AH is Question 7 Given that the molecular formula of sand is SiO, and that its specific heat is 0.84 J/g°C, its molar heat capacity is Question 8 Calculate the standard enthalpy change for the following reaction given that the 1° of benzene, C,H,(I) is 49 kJ/mol, the AHo of CO (g)--394 kJ/mol and AHo of H20(g)-242 kJ/mol 2C,H,(I) + 150(g) 12C0(g) + 6H,O(g) Question 9 The standard enthalpy of formation, H°, of which of the following is zero at room temperature (298K)? Select one a. All of the above b. CO (g) c. Br (g) d. HOI) e. Br(1) Question 10 A 47.3 g sample of an alloy was heated to 90.00 C and then dropped into a beaker containing 90.0 g of water at a temperature of 25.00 C. The temperature of the water rose to a final temperature of 28.00 C. The specific heat of water is 4.184 /g.C. What is the specific heat capacity of the alloy?

Explanation / Answer

5)

Q = 100 KJ (positive because system is gaining heat)

W = -25 KJ (negative because work is done by the system)

Now use:

delta U = Q + W

= 100 KJ - 25 KJ

= 75 KJ

Answer: 75KJ

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