If 6.00 g of carbon is burned completely, what volume of carbon dioxide gas is released at stp?
6.0 l
11.2 l
22.4 l
134.4 l

For this question, use the formula PV=nRT
firstly, define your knowns (this requires you to calculate moles of carbon)
P=101.3 kPa
V=?
n= 6.0/12 = 0.5
R= 8.31
T= 273 K
V= (0.5 x 8.31 x 273) / 101.3
   =11.19
therefore, 11.2 L of carbon dioxide will be produced 
NOTE: mole ratios were taken in to account, since there is one carbon in each CO2, the moles of carbon in the same matched the moles of CO2 produced in this instance

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.