Answer:
26.7%
Step-by-step explanation:
Data obtained from the question include:
Molar Mass of MgSO4 = 120g/mol
MgSO4 contain 1 mole of sulphur.
Molar Mass of sulphur (S) = 32g/mol
The percentage composition by mass of sulphur in MgSO4 is given by:
= Mass of S/ Molar Mass of MgSO4 x100
= 32/120 x 100
= 26.7%
Therefore, the percentage by mass of sulphur in MgSO4 is 26.7%