Question

If equal masses of O2 and N2 are placed in identical containers at the same temperature, which of the following statements is (are) true?
a. both flasks contain the same number of molefules
b. the pressure in the N2 flask is greater than in the other container
c. there are more molecules in trhe O2 flask
d. this question cannot be answered unless we know the pressure in each flask.
e. none of the above are correct

Answer 1

You should be able to answer each of the questions from the following:
32 g is a mole of O2; 28 g is a mole of N2. Therefore, equal masses will contain more moles of N2.

PV = nRT

1 mole contains 6.02 x 10^23 molecules.