JIK 223- Assignment 1

1. A chemical reaction takes place in a container of cross-sectional area 50.0 cm². As a result of the reaction, a piston is pushed out through 15 cm against an external pressure of 121 kPa. Calculate the work done by the system.

1. Consider a gas mixture in a 2.00 dm³ flask at 27.0 °C. For each of the following mixtures, calculate the partial pressure of each gas, the total pressure, and the composition of the mixture in mole percent:

a.       1.00 g H₂ and 1.00 g O₂

b.      1.00 g N₂ and 1.00 g O₂

c.       1.00g CH₄ and 1.00 g NH₃

1. If an industrial process, nitrogen is heated to 500 K in a vessel of constant volume. If it enters the vessel at 100 atm and 300 K, what pressure would it exert at the working temperature if it behaved as a perfect gas?

1. Calculate the work done when 50 g of iron reacts with hydrochloric acid to produce FeCl₂(aq) and hydrogen in a) a closed vessel of fixed volume and b) an open beaker at 25 °C.

1. A sample of propane (C₃H₈) is placed in a closed vessel together with an amount of O₂ that is 3 times the amount needed to completely oxidized the propane to CO₂ and H₂O at constant temperature. Calculate the mole fraction of each component in the resulting mixture after oxidation. Assume that the H₂O is present as a gas.                      

1. A refrigerator operates in a cyclic and reversible manner between 0 °C and 27 °C. Calculate

1. work done to freez 1 L of water

1.             coefficient of performance, given that the heat of fusion of water is 334.72 Jg^-1.

1. A gas obey the equation of state P(V-b) = RT where b is a constant. For this gas, sketch

                               a.            plot of V versus T at constant P

                              b.            plot of P versus V at constant T

                               c.            plot of P versus T at constant V