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Density of a Gas at STP

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The densities for most substances are measured in units of g/cm 3 or g/mL. However, the density of gases is usually measured in units of g/L. WHY? Because the amount of gas in 1 cm 3 is so small! On Reference Table S, the density for helium is given as g/cm 3 at 298K and kPa g/cm 3 =0.179 g/L

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Density of a Gas at STP A 22.4 L balloon filled with 4.00 g helium gas at STP A L cube filled with 4.00 g copper at STP Copper cube Is right here!

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6.45 g 5.00 L m V Density of a Gas at STP Ex. (1) What is the density of a gas with a mass of 6.45 g and a volume of 5.00 L? d= X X = = 1.29 g/L

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Ex. (2) What is the density of Xe gas (in g/cm 3 ) at 298 K and kPa? g/cm 3 m V Density of a Gas at STP d= d=

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3.926 g X m V Density of a Gas at STP Ex. (3) What would be the volume of g of methane gas (d = g/L) at STP? d= g/L X = = 5.48 L 1

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X 112 cm 3 m V Density of a Gas at STP Ex. (4) What is the mass (in grams) of 112 cm 3 of argon gas at 298 K and kPa? d= g/cm 3 X = = g 1

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