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Density measurements at STP were made on samples of the gases from two unlabeled cylinders of...

Density measurements at STP were made on samples of the gases from two unlabeled cylinders of pure noble gasses and were found to be 0.178 g/L and 0.900 g/L. Which gases might be present in each tank?

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Answer #1

we know that avogadro's law at STP 1 mole of gas occupy volume 22.414 L

1 mole gas = molar mass of gas in gm

we know another eqution

density = mass/volume thus,

mass = density volume

to calculate molar mass of gases take volume 22.414 L and density

# Cylinder which have density 0.178 g/L

molar mass = 0.178 22.414 = 3.99

the noble gas which have molar mass near 3.99 is Helium so, cylinder contain Helium(He)

# Cylinder which have density 0.900 g/L

molar mass = 0.900 22.414 = 20.1726

the noble gas which have molar mass near 20.1726 is Helium so, cylinder contain Neon(Ne)

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