Chemistry Unit 3

Dalton’s Partial Pressure
Pt = P1 + P2 + P3 + …
Px = (Mole Gasx / Total Moles) x Pt
Gram Formula Mass
Find the atomic mass for each atom in the compound and then add to find the total. Gram formula mass is written in grams per mole.
A standard scientific unit for measuring large quantities of very small entities such as atoms, molecules, or other specified particles.
Percentage Composition
Expresses the mass ratio between different elements in a compound.
Gram to Mole
1 mole = Gram Formula Mass
Number of Molecules to Mole
1 mole = 6.02 x 10^(23)
Liters To Mole
1 mole = 22.4 L
For gases at STP only
Change in Temperature Formula
?H = mC?T
Heat of Fusion Formula
?H = mHf
Heat of Vaporization Formula
?H = mHv
Units of Pressure at STP
AT 0C or 273K:
1 atmosphere/atm
101.3 kilopascals/kPa
760 mmHg
760 torrs
Boyles Law
There is an indirect relationship between pressure and volume.
As the volume decreases, the pressure increases.
Charles Law
There is a direct relationship between volume and temperature.
As volume increases, the temperature increases. Kelvins is used as temperature.
Combined Gas Law
Everything in this equation is changing.
Ideal Gas Law
At STP, PV = nRT
(Pressure in atm)(Volume) = (mole)(0.0821)(Temperature in K)

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