Asolid (a) is soluble in water to the extent of 1g per 100ml of water at room temperature and 10g per 100ml of water at the boiling point. how would you obtain pure a from a mixture of 10g of a,1g of impurity b (b has the same solubility in water as a) and 0.1g of impurity c (c is insoluble in water)? how many grams of pure a could be obtained after one recrystallization from water? how much pure a could be obtained, after one recrystallization, from a mixture of 10g of a,9g of b and 8g of c?

the electronic configuration of an atom with eight electrons is 1s²2s²2p⁴. the orbital diagrams are shown in the figure.

as per the hunds rule:

1. electrons tend to avoid being in the same orbital as per as practicable.

2. electrons in different orbitals of the same energy will have their spin parallel.

this can be illustrated from the multiplicity of the orbitals of the atom. as there are four electrons in the p orbital and p orbital has 3 sub-shells. the electrons can be fed in different ways as shown in the figure but the correct orbital diagram will be as per the hunds rule.

the earth would become to overheated and everything alive on it will eventually die from overheating. plants will eventually die as well, water will evaporate, and it will be nothing but a hot planet without anything living on it.