1. 1st law of thermodynamic
2nd tutorial

2. 1) In each of the following situations, find the change in internal energy of the system.
a)A system adsorbs 500 cal of heat at the same time does 400J of work.
b)A system adsorbs 300 cal and the same time 420J of work is done on it.
c)Twelve hundred calories is removed from a gas held at constant volume

3. 2) The temperature of 3 moles of a monoatomic ideal gas is reduce from 540k to 350k as 5500J of heat flows into the gas. Find; a)The change in initial energy? b)The work done by the gas?

4. 3) The initial temperature of 150g of ethanol was 22 deg celsius
3) The initial temperature of 150g of ethanol was 22 deg celsius. What will be the final temperature of the ethanol of 3240J was needed to raise the temperature of the ethanol?
(special heat capacity of ethanol is 2.44 J°C-1g-1)

5. 4) Calculate the internal energy, U when 1. 00 mol of H20 goes from 25
4) Calculate the internal energy, U when 1.00 mol of H20 goes from 25.5°C and 1.00 atm to 30.0°C and 1.00 atm. Densities of water are g/cm3 at 0°C and g/m3 at 100°C.

6. 5) A cylinder fitted with a friction piston contains 3
5) A cylinder fitted with a friction piston contains 3.00 mol of He gas at P=1.00 aym and is in a large constant temperature bath at 400k. The pressure is reversible increase to 5.00 atm. Find w, q and U for the process.

7. 6) If P1= 3. 00 atm, V1=500 cm3, P2= 1. 00 atm and V2=2000 cm3
6) If P1= 3.00 atm, V1=500 cm3, P2= 1.00 atm and V2=2000 cm3. Calculate the work, Wrev for process shown in figure (a) and (b).

8. 7) Gas expands by 1. 2L at a constant pressure of 2. 5x105 Pa
7) Gas expands by 1.2L at a constant pressure of 2.5x105 Pa. During the expansion, 500J of heat is added. Find the change in the internal energy of the gas. Draw a PV diagram with your solution.

9. 8) A sample containing 1000 moles of nearly ideal monoatomic gas is put through the cycle of operations shown to the right. BC is an isothermal, and PA=1.00 atm, VA = 22.4 m3, PB=2.00 atm. a)What is TA, TB and VC? b) What is the work done over each process? c) What is the total work done in one cycle?

10. THANK YOU