Ideal Gas Law.

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The Ideal Gas Law PV = nRT.

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Presentation transcript:

Ideal Gas Law

PV = nRT P = pressure (in atm) V = volume (in L) n = moles R = Universal Gas Constant (0.0821 L•atm / mol•K ) T = temperature (in Kelvin)

PV = nRT At 25°C and 785 torr, how many moles of hydrogen will occupy 100. L? n = 4.22 moles What is the volume occupied by 9.45 g of acetylene (C2H2) at 2.61 atm and 303 K? V = 3.46 L

PV = nRT A 85.5 g sample of gas occupies 95.0 L at STP. What is the molecular weight of this gas? N= 4.24 moles 363.4 g 1.089 g of a gas occupies 4.50 L at 20.5C and 0.890 atm. What is its molar mass?

Density = PM/RT What is the density of helium at 2.15 atm and -45ºC? d = 0.459 g/L Calculate the density, in grams/L of I2 at 785 mm Hg and 215 K 14.57 g/L

Summary PV = nRT “Normal” problems Molar Mass problems Density problems