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.
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
P1V1=P2V2
There is an indirect relationship between pressure and volume.
As the volume decreases, the pressure increases.
Charles Law
V1/T1=V2/T2
There is a direct relationship between volume and temperature.
As volume increases, the temperature increases. Kelvins is used as temperature.
Combined Gas Law
P1V1/T1=P2V2/T2
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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