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

A0.10 m aqueous solution of sodium sulfate is a better conductor of electricity than a 0.10 m aqueous solution of sodium chloride. which of the following best explains this observation? (a) sodium sulfate is more soluble in water than sodium chloride. (b) sodium sulfate has a higher molar mass than sodium chloride. (c) to prepare a given volume of 0.10 m solution, the mass of sodium sulfate needed is more than twice the mass of sodium chloride needed. (d) more moles of ions are present in a given volume of 0.10 m sodium sulfate than in the same volume of 0.10 m sodium chloride. (e) the degree of dissociation of sodium sulfate in solution is significantly greater than that of sodium chloride.