Consider the following two well-mixed, isothermal gas-phase batch reactors for the elementary and irreversible decomposition of a to b given by the following chemical equation: a k −−→ 2 b (1) in reactor 1, the reactor volume is held constant (reactor pressure therefore changes). in reactor 2, the reactor pressure is held constant (reactor volume therefore changes). both reactors are charged with pure a at 2.0 atm, a and b are considered ideal gases, and k = 0.35 min−1 .

(a) what is the fractional decrease in the concentration of a in reactors 1 and 2 after five minutes?
(b) what is the total molar conversion of a in reactors 1 and 2 after five minutes?

Amass of m 1.5 kg of steam is contained in a closed rigid container. initially the pressure and temperature of the steam are: p 1.5 mpa and t 240°c (superheated state), respectively. then the temperature drops to t2= 100°c as the result of heat transfer to the surroundings. determine: a) quality of the steam at the end of the process, b) heat transfer with the surroundings. for: p1.5 mpa and t 240°c: enthalpy of superheated vapour is 2900 kj/kg, specific volume of superheated vapour is 0. 1483 m/kg, while for t 100°c: enthalpy of saturated liquid water is 419kj/kg, specific volume of saturated liquid water is 0.001043m/kg, enthalpy of saturated vapour is 2676 kj/kg, specific volume of saturated vapour is 1.672 m/kg and pressure is 0.1 mpa.

Steel is coated with a thin layer of ceramic to protect against corrosion. what do you expect to happen to the coating when the temperature of the steel is increased significantly? explain.

An air conditioning system consist of a 5 cm diameter pipe, operating at a pressure of 200 kpa. the air initially enters the pipe at 15°c with a velocity of 20 m/s and relative humidity of 80%. if the heat supply throughout the process is 960 w, determine the relative humidity and the temperature at the outlet