A sample of oxygen gas that contains one-half of Avogadro's number of molecules has a mass of ________.

Question

Quizplus · Accepted Answer

One-half of Avogadro's number (6.02 x 10^23) of oxygen molecules is 3.01 x 10^23 molecules. The molar mass of oxygen is approximately 16.00 g/mol. Therefore, the mass of the sample is (3.01 x 10^23 molecules)(16.00 g/mol)/(6.02 x 10^23 molecules/mol) = 8.00 g. Choice B is the closest option to the calculated mass.

A Sample of Oxygen Gas That Contains One-Half of Avogadro's