Calculate for the number of moles using the ideal gas equation and the given conditions. Divide the calculated moles by the grams provided to determine the molar mass of the gas.

Recall that *ideal gas equation*:

A student adds 0.1727 g of an unknown gas to a 125-mL flask. The pressure of this gas sample is found to be 0.833 atm at 20.0 °C. Is the gas likely to be methane (CH_{4}), nitrogen (N_{2}), oxygen (O_{2}), neon (Ne) or argon (Ar)?

A. CH_{4}

B. N_{2}

C. N_{e}

D. Ar

E. O_{2}