What is the percent by mass of sodium in na2so4?

= 32.39 %

Explanation:

The relative atomic mass of sodium is 23, sulphur 32 while oxygen as a relative atomic mass of 16.

I mole of Na₂SO₄ has a relative mass of 2(23) + 32 + 4(16) = 142 grams

Of the value 142, the contribution of sodium is 2×23 =46

Thus the % composition is calculated:

46/142×100%= 32.39%  

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explanation: