Question

Find the molecular mass of.

Answer 1

Answer:

Explanation:

MOLECULAR MASS = ∑ the elements atomic mass from the periodic table

1st NaO

molecular mass = atomic mass of Na + Atomic mass of O

                          = ( 23 + 16 ) = 39 g/mol

2nd : AlCl3

       M.m = atomic  mass of Al + Atomic mass of 3Cl

              (   27 +  3x35.5 )= 97 g/mole

3rd : Na3(SO4)

     M.mass =  atomic mass of 3 Na + atomic mass of S + atomic mass of 4 O

                    ( 3x23) +  32  + (4 x 16)  =165 g/mol

4th : Mg(OH)2

    M.mass = atomic mass of Mg + atomic mass of 2 O + atomic mass of 2

                 =   24 +   2x16 + 2x1 = 58 g/mol

   

Answer 2

Answer:

1. sodium oxide Nao
2. aluminum chloride Al2cl3
3. sodium sulphate Naso4
4. magnesium hydroxide Mgoh2