What is the empirical formula of a compound that is 85.6% carbon and 14.4% hydrogen by weight?

1) since we have percentages, we can assume we have 100 grams of the compound.

85.6% Carbon---> 85.6 grams of C
14.4% Hydrogen--> 14.4 grams of H

2) we need to convert the grams to moles for each one using their molar masses. 

molar mass of C= 12.0 g/mol
molar mass of H= 1.01 g/mol





3) divide each mole by the smallest value(7.13) to find the ratios

Carbon---> 
Hydrogen---> 

4) use these ratios to write the empirical formula.

CH₂

Mass is the amount of matter in an object.  weight is the measurement of the pull of gravity on an object.  say for example, you travel to the moon which has a different gravitational field compared to the gravitational field of earth. (gravitational fields: earth = 1, moon = 0.165)  now when you are on the moon, the pull of gravity on you is different than on the earth. and as weight is the measurement of the pull of gravity on an object, that means yes, your weight can and will change on the moon.  however, on the moon, on earth or even on jupiter, the amount of mass inside of you remains the same. meaning your physical mass remains constant.  in conclusion it is possible for your weight to change as your mass remains constant.