Graphite exists as: a) Two dimensional layers of covalently bonded carbon atoms
b) A linear chain of covalently bonded carbon atoms
c) A tetrahedral structure of covalently bonded carbon atoms
d) A linear chain of covalently bonded carbon and hydrogen atoms

a) the particles of the chair are strongly held together.

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.