what is the mass of one mole of oxygen gas?\na 32 grams\nb 16 grams\nc 8 grams\nd none of the above

Explanation:

Step1: Identify oxygen gas formula

Oxygen gas is $O_2$.

Step2: Find atomic mass of oxygen

The atomic mass of one oxygen atom ($O$) is approximately 16 g/mol.

Step3: Calculate molar - mass of oxygen gas

Since oxygen gas is $O_2$, its molar mass is $2\times16$ g/mol = 32 g/mol. So the mass of one mole of oxygen gas is 32 grams.

Answer:

A. 32 grams