Question

0.5 L of a certain gas at STP weighs 0.58 g. Its molar mass of the gas is:

• A. 13 g mol${}^{-1}$.
• B. 26 g mol${}^{-1}$.
• C. 52 g mol${}^{-1}$.
• D. None of these

Answer 1

The correct option is B 26 g mol${}^{-1}$.

0.5 L of a certain gas at STP weighs 0.58 g.

22.4 L of the gas will weigh $\frac{0.58}{0.5}\times 22.4=25.9\approx 26$ g. This is the molar mass of the gas.

Hence, the correct option is $\text{B}$