9. Inhaling an average human lung volume of 6.0 Liters would cause you to gain how many grams due to O2 gas? (if your lungs were at STP and air was 100% O2)?

10. How much mass would you lose by exhaling the same 6.0 Liters of CO2 (assuming
STP and 100% of exhalation was CO2)?

Ithink it is quantity of plants

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. 

Aconductor easily transfer heat