The producer gas made from the coke has the following composition :
co : 28%, co2 : 3.5%, o2 : 0.5% and n2 : 68%.
the gas burned with such a quantity of air that the oxygen from air is 20% in excess of the net oxygen required for complete combustion. if the combustion is 98% complete, calculate the weight of the gaseous product formed. given the oxidation reaction as below:
co + ½ o2 à co2

Adozen is 1221/12 = 1.751.75 x 12 = 21therefore, 1.75 is the answer.

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. 

The answer is neonhope it