Question

deduce the molecular masses of compound O(16) , N(14) , K(39)

Answer 1

Na2SO4 : Sodium sulphate  

Molecular Mass : 23(2)+32+16(4) = 46+32+64 = 142 g/mol

K2CO3 : Potassium carbonate

Molecular Mass : 39(2)+12+16(3) = 78+12+48 = 138 g/mol

Carbon dioxide

Molecular Mass : 12+16(2) = 12+32 = 44 g/mol

Magnesium chloride

Molecular Mass : 24.31+35.5(2) = 95.31 g/mol

Sodium bicarbonate

Molecular Mass : 23+1+12+16(3) = 23+1+12+48 = 84 g/mol