Question

help me with this ...​

Answer 1

Answer:

here is your answer dear

Answer 2

The molecular formula of sodium sulphate is (Na2SO4).

Molar mass = atomic mass of Na(23) + atomic mass of S(32.066) + atomic mass of O(16)

Molar mass of (Na2SO4) = [(2 × 23.0) + (32.066) + 4 (16.00)] = 142.066  

Mass percent of an element  

= (mass of the element/mass of the compound)*100

∴ Mass percent of sodium:  

(46.0/142.600)*100

=32.379

= 32.4%

Mass percent of sulphur:

(32.006/142.600)*100

=22.57

= 22.6%

Mass percent of oxygen:

 (64/142.600)*100

=45.049

= 45.05%