Question

3.
What is the percentage of Mg in magnesium sulphate is: (atomic mass of Mg =24,S=32,0=16)?
O(a) 1
O (b) 30
(c) 60
O (d) 20​

Answer 1

Explanation:

nearly 23 approx , Mass °/. = mass of component

_________________ × 100

mass of total solution

Answer 2

Answer:

We know that mass % of element is calculated as

Formula for magnesium sulfate is MgSO4

It's molecular mass is 120.366 g/mol

Mg Atomic mass is 24.304 u

Atom of Mg present in Molecular formula is 1

Therefore, Mass of Mg Atom = 24.304 × 1

= 24.304 u

Mass % = Mass of Atom / MM × 100

Therefore, % Mg = 24.304 / 120.366 × 100

= 20.19 %

Therefore option d is correct.

Similarly we find mass % of sulphur oxide.

Thank you,

By

Aaditya Singh