How much heat is needed for the decomposition of 168.4 g of sodium nitride into nitrogen and sodium

at around  360  Kelvin ( K ) or  86.85 ∘ C

Explanation:

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.