Potassium permanganate (KMnO2) is used as an explosive agent. How many moles are there if we have 105.66 grams of potassium
permanganate?

0.67mole

Explanation:

Given parameters:

Mass of potassium permanganate  = 105.66g

Unknown:

Number of moles  = ?

Solution:

To find the number of moles of the given compound;

  Number of moles  =  

Molar mass of KMnO₄   = 39 + 55 + 4(16) = 158g/mol

  Number of moles =   = 0.67mole

i do not get it   at all

atomic mass = 39

number of neutrons = 20

number of protons= 19

electronic configuration = 1s2 2s2 2p6 3s2 3p6 4s1

the number of electron in first shell = 2

number of electrons in n=3 shell = 8