Gaseous methane (ch_4) will react with gaseous oxygen (o_2) to produce gaseous carbon dioxide (co_2) and gaseous water (h_2o). suppose 6.42g of methane is mixed with 49. g of oxygen. calculate the minimum mass of methane that could be left over by the chemical reaction. be sure your has the correct number of significant digits.

You ugly, you yo daddy's son. 
 
Juju on that beat, okay
 

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.