Question

Calculate the mass percent of different elements present in sodium sulphate

Answer 1

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◀Molecular Formula : Na2SO4.

◀Molecular Mass : 46 + 32 + 64 = 142 u.

Mass % of different elements -

1) Na. 46 / 142 × 100 = 32.3 %

2) S , 32 /142 × 100 = 22.53%

3) 64/142 ×100 = 45.07%

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Answer 2

Given Element:

Na2SO4

Calculating the Molar Mass Of Na2SO4:

= [(2 x 23.0) + (32.066) + 4(16.00)]

= 142.066 g

Formula Used To Find The Mass Percent Of An Element:

Mass of the Element of that Compound / Molar Mass of that Compound * 100

Calculating Mass Percent Of The Sodium Element:

= $\frac{46.0g}{142.066g} * 100$

= 32.379

=32.4% (Rounding off)

Mass Percent Of The Sulphur Element:

= $\frac{32066g}{142.066g} * 100$

= 22.57

=22.6% (Rounding off)

Mass Percent Of The Oxygen Element:

= $\frac{64.0g}{142.066g} *100$

=45.049

=45.05% (Rounding off)