A scientist observed changes in the gas pressure of one mole of a gas in a sealed chamber with a fixed volume. To identify the source of the changes, the scientist should check for the variations in the :

Question

anonymous · Answer

a. air pressure outside the chamber
b. molecular formula of the gas
c. temperature of the chamber 
d. isotopes of the gas

jfraser · Answer

If it's a sealed container, does the pressure outside matter? Also, does the identity of a gas matter when describing the pressure? Should the isotopes of the gas matter, either? There's only 1 more piece that could change inside the container.

anonymous · Answer

You're  being asked to identify the variables on which the pressure of a gas depends.  That is, there's an equation p = f(?,?,?) where f is some function of some variables.  Do  you know any equation for the pressure of a gas?  On what variables does it depend?  You're being given a choice of variables here -- p outside the chamber, M (the molar mass of the gas), and T, the temperature of the gas. Any of those sound familiar?