## 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 LFor 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/atm101.3 kilopascals/kPa760 mmHg760 torrs
 Boyles Law
 P1V1=P2V2There is an indirect relationship between pressure and volume.As the volume decreases, the pressure increases.
 Charles Law
 V1/T1=V2/T2There 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/T2Everything 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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