A 0.115 mol sample of Xe gas is contained in a 4.00 L flask at room temperature and pressure. What is the density of the gas, in grams/liter, under these conditions?

density = 3.77 g/L

Explanation:

The density of the gas is the mass of the gas divided into the volume:

density = mass/volume

We can obtain the mass from the moles of gas and the molar mass. From the Periodic Table, we know that the molar mass of Xe is 131.3 g/mol. Thus, we multiply the number of moles by the molar mass (MM):

mass = moles x MM = 0.115 mol x 131.3 g/mol = 15.09 g

Finally, we calculate the density by dividing the mass into the given volume:

density = mass/volume = 15.09 g/4.00 L = 3.77 g/L

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