Question

Calculate the mass % of different
elements presentin sodium sulphate
Na2So4​

Answer 1

Answer:

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

142.066g

46.0g

∗100

= 32.379

=32.4% (Rounding off)

Mass Percent Of The Sulphur Element:

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

142.066g

32066g

∗100

= 22.57

=22.6% (Rounding off)

Mass Percent Of The Oxygen Element:

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

142.066g

64.0g

∗100

=45.049

=45.05% (Rounding off)

Answer 2

Answer:

Na = 32.40%

S = 22.53%

O = 45.07%

Explanation:

Molecular mass = (23*2)+(32*1)+(4*16)

Molecular mass = 46+32+64

Molecular mass = 142 a.m.u

Na = 46/142*100

    = 32.40%

S   = 32/142*100  

    = 22.53%

O  = 64/142*100  

    = 45.07%