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(Solved) C ONCORDIA U NIVERSITY, D EPARTMENT OF C HEMISTRY CHEM234 - Thermodynamics, Assignment 1 Student ID: ___________________________________ Last...


hi, 

for the question 2.1 on energy, heat and work, they ask for the internal Fergie dU. and we know dU= q+w we don't have any of these values.is it possible to une the densities to find the answer ? 

C ONCORDIA U NIVERSITY, D EPARTMENT OF C HEMISTRY CHEM234 – Thermodynamics, Assignment 1 Student ID: ___________________________________
Last & First Name: _____________________________
September 22, 2016 PLEASE NOTE
• Hand in this cover sheet with your work sheets stapled to them.
• Write legibly on clean sheets of paper.
• Show all calculation steps in detail with the formulas used and the meaning of variables
explained.
• Report your results in the correct units and with the correct number of significant figures.
• Underline your final result.
• Marks for each question are given in square brackets. 1 1 P ERFECT AND R EAL G ASES
1.1 T HE P ERFECT G AS
A Geiger–Müller counter tube to measure radioactivity is filled with a gas mixture containing
5.00 mol-% butane and 95.0 mol-% argon. It is prepared by allowing gaseous butane to fill an
evacuated cylinder at 1.00 atm pressure. The 40.0 dm3 cylinder is then weighed.
a. Calculate the mass of argon that gives the desired composition, if the temperature is maintained at 25 °C.
b. Calculate the total pressure of the final mixture. The molar mass of Ar is 39.9 g mol−1 . 1.2 R EAL G ASES
Compare the pressures predicted for 0.800 dm3 of Cl2 weighing 17.5 g and 275.15 K using
a. The ideal gas equation.
b. The van der Waals equation with a = 0.6579 Pa m6 mol−2 and b = 0.0562 × 10−3 m3 mol−2 . 2 T HE F IRST L AW
2.1 E NERGY, H EAT AND W ORK
The densities of ice and water at 0 °C are 0.9168 and 0.9998 g cm−3 , respectively.
a. If ∆H for the fusion process at atmospheric pressure is 6.025 kJ mol−1 , what is ∆U?
b. How much work is done on the system? 2.2 T HE F IRST L AW AND I DEAL G ASES
With the temperature maintained at 0 °C, 2 mol of an ideal gas are allowed to expand against
a piston that supports 2 bar pressure (neglect friction). The initial pressure of the gas is 10 bar
and the final pressure is 2 bar.
a. How much energy is transferred to the surroundings during the expansion?
b. What is the change in internal energy and the enthalpy of the gas?
c. How much heat has been absorbed by the gas? 2 2.3 T HERMOCHEMISTRY
The bacterium Acetobacter suboxydans obtains energy for growth by oxidising ethanol in two
stages:
a. C2 H5 OH(l) +
b. CH3 CHO(l) + 1
2
1
2 O2 (g) → CH3 CHO(l) + H2 O(l)
O2 (g) → CH3 COOH(l) The enthalpy (∆c H °, kJ mol−1 ) increases in the complete combustion to CO2 and liquid H2 O
of the three compounds are as follows:
a. Ethanol, liquid: −1370.7
b. Acetaldehyde, liquid: −1167.3
c. Acetic acid, liquid: −876.1
Calculate the ∆c H °for reactions (a) and (b). 3

 


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