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Gas Laws

Gas Laws. Boyle’s – PV at const Temp Charles’- V/T at const Pressure Combined – PV/T Ideal – PV=nRT Dalton’s – P T =P 1 + P 2 +… Graham’s –. STP. Standard Temperature and Pressure Standard temp is 273 degrees Kelvin 0 degrees Celsius All gas laws use Kelvin temp

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Gas Laws

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  1. Gas Laws Boyle’s – PV at const Temp Charles’- V/T at const Pressure Combined – PV/T Ideal – PV=nRT Dalton’s – PT=P1 + P2 +… Graham’s –

  2. STP • Standard Temperature and Pressure • Standard temp is • 273 degrees Kelvin • 0 degrees Celsius • All gas laws use Kelvin temp • Convert Temp to Kelvin deg K = deg C + 273 • Can’t have negative volume or pressure • Absolute zero, lowest possible temp, zero KE • Gas Laws good for ideal gases over normal temp ranges

  3. Pressure • Standard Pressure • 1atm (exact) • 101.3 kPa • 760 mmHg (to three decimal places) • 760 torr (to three decimal places)

  4. Pressure conversions What pressure in kPa is 345 mmHg? 345 mmHg(converting) 101.3 kPa(converting to) 760 mmHg(converting from) Standards, 1 atm = 101.3 kPa = 760 mmHg = 760 torr 345 x 101.3 / 760 = 45.98 = 46.0 kPa

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