6. difference between mixtures and compounds:
7. draw a neat and labeled diagram for the following:
a) separating mixture of oil and water
b) sublimation of camphor or iodine or ammonium chloride
8. with the of a flow chart explain the separation of gases from air.

one negative thing it that it can kill water animals. another negative thing is it can cause the destruction of ecosystem. one way water pollution can be reduced is to conserve energy.

c. 4.54 x 10–12 j happens to be correct

option c: 1605.1 kj

the balanced chemical reaction for combustion of methane is as follows:

here, enthalpy formation of is -74.7 kj/mol, 0 kj/mol, -393.5 kj/mol and -241.82 kj/mol respectively.

the heat released or can be calculated as follow:

putting the values,

thus, heat released by combustion of 1 mol of methane is 802.54 kj/mol. thus, for 2 mol, heat released will be:

therefore, heat released by the combustion of 2 mol of methane is 1605.1 kj.