Question

Calculate the mass percentage of different elements in na2so4

Answer 1

Hi there,

Key:

☆ mass percentage of element =

Atomic mass of element ÷ molar mass of compound × 100

● Na atomic mass = 23

● S atomic mass = 32

● O atomic mass = 16

● Na2SO4 molar mass = 142

■ Na% = (23×2 / 142) ×100 = 32.39%

■ S % = (32 / 142 )×100 = 22.53 %

■ O% = (16×4 / 142 ) × 100 = 45.07 %

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Answer 2

Answer:

Molar mass of Na2SO4 = [(2 × 23.0) + (32.00) + 4 (16.00)] = 142 g

Mass percent of an element = (Mass of that element in compound/Molar mass of that compound) × 100

∴ Mass percent of sodium (Na): (46/142) × 100 = 32.39%

Mass percent of sulphur(S): (32/142) × 100 = 22.54%

Mass percent of oxygen:(O): (64/142) × 100 = 45.07%