the ideal gas law equation is as follows
pv = nrt
where p - pressure
v - volume
n - number of moles
r - universal gas constant
t - temperature
so if the pressure, volume and temperature are already known
we are left with n and r
since r is the universal gas constant that has a known fixed value then r too is known
so we are left with 'n'
once we know temperature volume and pressure
we can find the number of moles of gas present using the ideal gas law equation
this is not my own answer, this is an answer for the same question by the user blahblahmali. i do not claim ownership of this account.
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.