Name the compound CH3-CH3

Ethane

Explanation:

CH3-CH3 is an alkane by the name of ethane. In organic chemistry there is a systematic way of naming compounds according to the prefix (eth) and the suffix (ane.)

The prefixes vary according to the number of carbon atoms:

1 C = meth

2 C = eth

3 C = prop

4 C = but

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.

∠gdh and ∠edh on edg.

answer is c