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AP Chapter 5

# 0 l of o2 and 750 l of nh3 both measured at stp what

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Unformatted text preview: NO would be produced? What mass of NO is produced from 500. L of NH3 at 250.0C and 3.00 atm? 5 Dalton's Law The total pressure in a container is the sum of the pressure each gas would exert if it were alone in the container. The total pressure is the sum of the partial pressures. PTotal = P1 + P2 + P3 + P4 + P5 ... For each P = nRT/V 31 32 Dalton's Law PTotal = n1RT + n2RT + n3RT +... V V V In the same container R, T and V are the same. PTotal = (n1+ n2 + n3+...)RT V PTotal = (nTotal)RT V The mole fraction Ratio of moles of the substance to the total moles. symbol is Greek letter chi Examples The partial pressure of nitrogen in air is 592 torr. Air pressure is 752 torr, what is the mole fraction of nitrogen? What is the partial pressure of nitrogen if the container holding the air is compressed to 5.25 atm? 1 = = P1 nTotal PTotal n1 33 34 Examples 4.00 L CH4 2.70 atm 1.50 L N2 4.58 atm 3.50 L O2 0.752 atm Vapor Pressure Water evaporates! When that water evaporates, the vapor has a pressure. Gases are often collected over water so the vapor pressure of water must be subtracted from the total pressure to find the pressure of the gas. It must be given. 36 When these valves are opened, what is each partial pres...
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