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Gas Laws Continued

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Atmospheric Pressure Let’s calculate the amount of atmospheric pressure pressing on our bodies! Step 1: Calculate body surface area. Use this equation: M 2 = (Ht in Cm) 0.3964 x (Wt in Kg) 0.5378 x 0.024265

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Atmospheric Pressure Conversions: 1in = 2.54 cm 1lb =.45 Kg Step 2: Next convert Meters 2 into Inches 2. –One Meter = 39.36 Inches. –1M 2 = 1550 In 2. Step 3: Multiply your answer from step one with step two. Step 4: Multiply your answer from step 4 by 13.0 psi (PSI in Fort Collins)

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Example Height = 69 in –175.26 cm Weight = 130 lbs – 59 Kg (175.2cm) 0.3964 x (59Kg) 0.5378 x0.024265= 1.676 M 2 1.676M 2 x 1550 in 2 = 2597.8 in 2 2597.8in 2 x 12.5psi = 32,472.5 lbs 32,500.00 Lbs

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Put it into Perspective This is the same as three full grown elephants. This is the same as 12 Honda Civics. This is the same as one semi-truck.

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Ideal Gas Law The Ideal Gas Law allows us to account for the number of moles of gas in a system. The Ideal Gas Law automatically adjusts to standard temperature and pressure using the Ideal Gas Constant (R).

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Ideal Gas Law PV=nRT Pressure is proportional to temperature. (T) Pressure is proportional to number of moles. (n) Pressure is inversely proportional to volume. (V)

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The Universal Gas Constant R is the universal gas constant that corrects for systems not at STP. The value of R varies depending on which units of pressure are being used. R = 0.0821 L atm/mol K R = 62.4 L mmHg/mol K R = 8.31 L kPa/mol K

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Dalton’s Law John Dalton (1766-1844) At a constant volume and temperature, the total pressure exerted by a mixture of gases is equal to the sum of the partial pressures of those gases.

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Dalton’s Law Each gas exerts its own pressure as if the other gases were not there. You can add the individual pressures of each gas to obtain the total pressure of a gas mixture. Mathematical Expression –P total =P 1 +P 2 +P 3 +P 4 …………

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The “Litter Box” Equation = dRT/P A useful version of the Ideal Gas Law involved molar mass and gas density. If gas density (d in g/L) is known, molar mass ( in g/mol) can easily be calculated. We call it the “litter box” equation because a kitty says “mu”, takes a “P”, and kicks “dRT” over it.

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Review Which line on the graph at the left best illustrates Boyle’s Law of pressure and volume? If you said “D”, you are correct! Pressure VolumeVolume A B C D

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Review Which line on the graph shows Charles’ Law, the relationship between temperature and volume? If you said “A” you are correct. Temperature VolumeVolume A B C D

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Review Which line best illustrates Gay- Lussac’s law of pressure vs. temperature? If you said “A” again, you are correct. Temperature PressurePressure A B C D

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