Unit 9 Chem

STP

Standard Temperature and Pressure

What volume does a mole of any gas have at STP?

Any gas at STP that’s 1 mol is exactly 22.4 L.

How many Liters are in 1 mol?

22.4

What is the temperature at STP?

273.15 K

What is the pressure at STP?

101.2 kPa

Polar molecule

Lone pairs on central atom

Dipole-Dipole

Polar molecule

Constant of volume

1L

If temperature decreases when volume is held constant, what happens to pressure?

Pressure decreases because pressure and temperature are directly proportional.

If volume increases when pressure is held constant, what happens to temperature?

Temperature increases because temperature and volume are directly proportional.

What happens to volume when pressure decreases and temperature is held constant?

Volume increases because volume and pressure are inversely proportional.

If temperature increases and pressure decreases, what happens to volume?

Volume would increase because volume is directly proportional to temperature and inversely proportional to pressure.

When there are moles in an question what equation do we use?

PV=nRT