Lithium nitride is an ionic compound. Nitrogen trifluoride is a covalent compound. Lithium nitride has a high melting point, 813 °C. Nitrogen trifluoride has a low melting point,
-207 °C why are the melting points are different.

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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.