what are some important problems for molality concept

Asked by manoj115860 | 30th Jun, 2017, 01:31: PM

Expert Answer:

Problems based and asked on all the concepts covered in the chapter are important.

Given below are some important formulae which will help you in solving the problems.

Relative molecular mass of a gas or vapour = 2 × VD

Mole and Gram Atomic Mass: One mole of atoms = 6.022 ×1023 atoms

                                                                                = Gram atomic mass of an element

                                                                                = 1 gram atom of the element

 

Mole and Gram Molecular Mass: One mole of molecules = 6.022 ×1023 molecules

                                                                                           = Gram molecular mass

                                                                                           = 1 gram molecule of the compound

 

Mole in terms of volume:               One mole of a gas        = 22.4 litres at S.T.P.

 

Moles of an element = Mass of the element

                                   Atomic mass or GA.W

 

Moles of a compound = Mass of the compound

                                     Molecular mass or GMW

 

Mass of one atom = Atomic Mass or GAW

                                      6.022 × 1023

 

Mass of one molecule = Molecular Mass or GAW

                                             6.022 × 1023

 

Number of molecules = Moles × 6.022 ×1023

 

Number of atoms = Moles × 6.022 ×1023

 

Answered by Vaibhav Chavan | 30th Jun, 2017, 02:51: PM