# Question #d8eb4

Aug 6, 2016

All of the above.

#### Explanation:

Assuming that pressure is also kept constant for all five gases, then the answer must be that gas $\text{X}$ can be any of the four gases listed as possible answers.

The identity of the gas can only be determined if information about the mass of the sample is provided in the problem.

Since this is not the case here, you can safely assume that equal numbers of nitrogen gas, ${\text{N}}_{2}$, carbon monoxide, $\text{CO}$, carbon dioxide, ${\text{CO}}_{2}$, nitric oxide, $\text{NO}$, and hydrogen gas, ${\text{H}}_{2}$ will occupy the same volume under the same conditions for pressure and temperature $\to$ think Avogadro's Law here.

However, they will not have the same mass because these gases have different molar masses.

Since no information about mass was provided, you simply can't say that one of the four options is correct. Using the information given, all four options are correct.