While working on a chemistry handout, Saul and Jared disagree
about the following equation:
Na2CO3(s) + 2HCl(aq) - 2N a Cl(aq) + H 20 (1) + CO2
Saul says the equation is perfectly balanced but Jared disagrees.
Jared says that because one of the products is a gas, its mass can't
be added to the product side since it just floats away. Which student
is correct and why?

Organisms are more likely to be more preserved in mud than sand because mud is moist and wet, while sand is very dry.

Ibelieve your answer is true 

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.