Section A
Q1.
(a)
A coal having the following composition is burnt in a boiler :
C 80% H 5% O 4.5% Ash 7.0% Moisture 3.5%
Calculate the theoretical air required for complete combustion of 100 kg of coal.
(b) A coal containing 15% ash and 85% carbon is burnt in a combustion chamber. The residue is found to contain 80% ash and 20% carbon. Find out the amount of residue formed and CO2 produced for 100 kg of coal.
(c) Does the Kelvin-Planck Statement of Second Law of Thermodynamics prohibit the complete conversion of energy absorbed in the form of heat into work by a device in a process? Explain with an example.
(d) A reaction A \longrightarrow B is carried out at 77°C which required 25 minutes time for completion. If the same reaction is carried out at 97\circC, the time required to complete the reaction is reduced by 80%. Calculate the activation energy of the reaction. R = 8.314 J/mol. K.
(e)
A liquid reactant decomposes by 1st order reaction kinetics in a batch reactor.
A 1st order \longrightarrow Product
50% of A is converted to product in 10 minutes. How much time would it take to achieve a conversion of 80%?
