What is the mass of air occupying the same volume? the density of air at room temperature is 1.20 g/l.?

water is used to store them because it would keep the radiation from getting out in the open and causing harm to the workers

weight of any object is given by

w = m*g

where m is mass of the object and g is the acceleration due to gravity.

for earth the value of g is 9.8 m/s^2 so

w=117.6 n m=12 g=?

117.6=12g => g=9.8 m/s^2

which is the force of gravity on earth.