PLZ I need help really badly and really quickly 1)Suppose the temperature of 4.39 L of ideal gas drops from 381 K to 275 K.
(a) If the volume remains constant and the initial pressure is atmospheric pressure, find the final pressure.
Pa

(b) Find the number of moles of gas.
mol

2) An ideal gas at 24.9°C and a pressure 1.40 105 Pa is in a container having a volume of 1.00 L.
(a) Determine the number of moles of gas in the container.
mol

(b) The gas pushes against a piston, expanding to twice its original volume, while the pressure falls to atmospheric pressure. Find the final temperature.
K

Ethene molecular fórmula= c2h4molecular weight = 29.046g/molhope it : )

Yes it would be a physical change.

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.