The Mr of 2MgSO4 is 240.6 g/mol
calculation
The atomic mass of 2MgSO4 = 2 ( atomic mass of Mg +atomic mass of S +atomic mass of 4 atoms of O)
from periodic table the atomic mass of Mg= 24.3 g/mol, s=32 g/mol,
O = 16 g/mol
Atomic mass of 2MgSO4 is therefore = 2 [ 24.3 +32 +( 16 x4)]
= 240.6 g/mol
