What are the advantages of selling coal by the mass

1. Heating coal reduces the mass by the loss of moisture.

2. Presence of moisture reduces the heating value of coal.

3. It is used to produce energy and it is easier for transportation.

4. Coal on refining is used to prepare phenol, naphthalene and other useful chemicals.

5. On combustion produces sufficient supply of energy, Hence it is used as a full time energy source.

6. Not too much of ash is produced on combustion.

> b takes place in the gas phase in an isothermal tubular reactor. the feed is one mole of a per one mole of c, an inert. the entering temperature and pressure are 427°c and 10 atm, respectively. the gas constant r = 0.08206 atm · l/mol · k.

c is having 4 valence electrons and is bonded to three hydrogens and one sulphur atom, therefore, the number of bond pair is equal to four. as all the valence electrons are used in forming the bonds so, there is no lone pair left on carbon.

s is having 6 valence electrons and is bonded to one other sulfur atom and one carbon atom, therefore, the number of bond pair is equal to 2. as only two valence electrons are used in forming the bonds so, four electrons are left. therefore, two lone pairs are present on s.