Question

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Answer 1

Answer:

here is your answer dear

Answer 2

Answer:

Explanation:

Mass % of element = Mass of element in compound / molar mass of compound * 100

Molar mass of Na2SO4 = 2 ( 23.0) + 32 + 4 * 16.6

Mass % of sodium = 46/142 * 100 = 32.39%

Mass % of sulphur = 32/142 * 100 = 22 . 54 %

Mass % of oxygen = 64 / 142 * 100 = 45.07%