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 –Convert Temp to Kelvin deg K = deg C Can’t have negative volume or pressure Absolute zero, lowest possible temp, zero KE –Gas Laws good for ideal gases over normal temp ranges

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

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