The microstructure of an iron-carbon alloy consists of proeutectoid cementite and perlite; the mass fractions of these microconstituents are 0.11 and 0.89, respectively. determine the concentration of carbon in this alloy.

i do not get it   at all

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.