Question

Find out the molarity of a solution which is prepared by mixing 3.011 × 10^22 solute particale in 100ml of solution.

Answer 1

Convert no of atoms to moles
moles = No of atoms/Avagadro's number
moles = (3.011*10^22)/(6.022*10^23)
moles = 0.05

moles = given mass/atomic mass
0.05 = 1.15/atomic mass

atomic mass = 1.15/0.05 = 23
Element weight = 23