What is the percentage composition for hydrogen in the compound c2h4

ANS: C = 85.63 %; H = 14.37 %

C = 2 x 12.01 u = 24.02 u

H = 4 x 1.008 u = 4.032 u

TOTAL = 28.052 u

% C = (24.02/28.052) x 100 % = 85.63 %

% H = (4.032/28.052) x 100 % = 14.37 %

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.