Question

What will be the mass of 2 moles of following:-(i) MgSo4 (ii) KCl ?

Answer 1

1 mole of MgSO4 has molar mass

Molar mass = 24+32+16×4=120

Now for 2 moles it will be twice i.e 240u

1 mole of KCl has molar mass

molar mass=39+35=74

Now for 2 moles it will be

148u

Answer 2

molecular mass of MgSO4 and KCl is 120 and 74.5 respectively.

1 mole = molecular mas (in gram)

so, mass of 2 moles of MgSO4 =(120 x 2) g =240 g

and KCl = (74.5 x 2) g = 149 g