A 48.6 gram sample of a noble gas occupies a volume of 13.0 L at STP. What is the identity of the gas? Enter the elemental symbol of the gas.

Answer 1

To identify the gas we need to find the molar mass. We know the mass (48.6g), so we must find the number of moles. Since it it’s at STP we can use the fact that 1 mole = 22.4 liters.

13.0 L x 1 mol/22.4 L = 0.580 moles

molar mass = 48.6 g/0.580 moles = 83.8 g/mole

The noble has would be Krypton