Questions 1. The gas phase decomposition of dinitrogen
pentoxide, represented by the following balanced
chemical equation, was studied:
2 N. Os() --- 4 NO(g) + (8)
The initial rate of reaction was determined by
measuring the rate of change in the concentration
of dinitrogen pentaxide gas, N. O.(g), at constant
temperature near the beginning of the reaction
(Table 7).
Write the rate law equation for the reaction, and
calculate the value of the rate constant. I
Table 7 Initial Data from Constant Temperature Runs
Initial (N20,(9) Initial rata
(mol/L)
(mol/(L-s))
1
0.0750
8.90 x 10
2
0.190
2.26 x 10
3
0.275
3.26 x 10
4
0.410
4.85 x 10
Run

Ibelieve its a because an empirical formula usually has a ch in it your options are a or b

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. 

Here is the link to the all information u need i mean answer key