Apparent weight : 10 N
upthrust = weight of liquid displaced = 2 N
since,
apparent weight = real weight - upthrust
or 10 = real weight - 2
real weight = 10+2
= 12 N
Upthrust = weight of the liquid =2 N
since, weight of liquid displaced in air = 12 N
So, w =mg
12= m *9.8
m= 12/9.8
m = 1.22 kg
This experiment is based on Archimedes principle.