Tutorial 1

Tutorial 1 By Miss Anis Atikah Ahmad

Question 1 Calculate CP of 586 g of CH4 (g) at 2000K and 1 bar if CP,m of CH4 at 2000 K and 1 bar is 94.4 Jmol-1K-1

Question 1 • Recall • Find n; Thus; Value is not given

Question 2 Adam and Anthony found that, for air at 28°C and pressures in the range 1 to 40 atm. Calculate for air at: • 28°C and 1.00 atm • 28°C and 2.00 atm

Question 2 Given; , Find can be written as; Assuming air as ideal gas, Thus; Derive to another equation Value is not given

Question 2 (a) Extract out the data & substitute in the equation: (b) Doubling P;

Question 3 One mole of He gas essentially independent of temperature expands reversibly from 24.6 L and 300 K to 49.2 L. Calculate the final pressure and the temperature if the expansion is: (a) isothermal (b) adiabatic Sketch these two processes on a P-V diagram

Question 3 • Extract out the information: • Isothermal process; ΔT=0 Thus;

Question 3 (b) Adiabatic process; q=0 For reversible adiabatic process; where Recall:

Question 3 (b) Calculate pressure at initial state first since it is not given; Calculate pressure at final state:

Question 3 (b) Calculate temperature at final state;

Question 3 (c)

Question 4 One mole of liquid water at 30°C is adiabatically compressed, P increasing from 1.00 to 10.00 atm. Since liquids and solids are rather incompressible, it is fairly good approximation to take V as unchanged for this process. Calculate q, ΔU, and ΔH for this process.

Question 4 • Extract out all the information: The process is adiabatic, ΔV=0 • Since the process is adiabatic, • Calculate work: 0

Question 4 • Calculate ΔH

Question 4 For water

Question 4

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