Consider a sample of helium gas in a container fitted with a piston as pictured below. the piston is frictionless, but has a mass of 10.0 kg. how many of the following processes will cause the piston to move away from the base and decrease the pressure of the gas? assume ideal behavior.
i. heating the helium.
ii. removing some of the helium from the container.
iii. turning the container on its side.
iv. decreasing the pressure outside the container.
a) 0
b) 1
c) 2
d) 3
e) 4

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.