PLEASE HELP ASAP The molar mass of two equally sized samples of unknown gaseous compounds is shown below.

Molar Mass Comparison
Gas Molar Mass
X 28 g/mol
Y 44 g/mol

At STP, which describes the density and effusion of both gases?
A. Gas X has a higher density and effuses faster than Gas Y.
B. Gas X has a higher density and effuses slower than Gas Y.
C. Gas X has a lower density and effuses slower than Gas Y.
D. Gas X has a lower density and effuses faster than Gas Y.

Smog is the term used to describe the combination of fog and smoke

Achemistry student needs to standardize a fresh solution of sodium hydroxide. he carefully weighs out of oxalic acid , a diprotic acid that can be purchased inexpensively in high purity, and dissolves it in of distilled water. the student then titrates the oxalic acid solution with his sodium hydroxide solution. when the titration reaches the equivalence point, the student finds he has used of sodium hydroxide solution.calculate the molarity of the student's sodium hydroxide solution. be sure your answer has the correct number of significant digits.

Which scenario is most similar to the type of collision that gas particles have according to kinetic molecular theory