Asealed vessel containing argon, oxygen, nitrogen has a total pressure of 1514 psi and particle pressure of 325 psi for oxygen and 649 psi for nitrogen. what is the partial pressure of argon in psi

The law of partial pressures states that each component exerting pressure contributes to the total, and the sum of these pressures equals the total exertion. This means that the pressure of all three gases added together equals 1514.

X + 325 + 649 = 1514
X=540

The partial pressure of Argon in this system is 540 pounds per square inch.

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.