Gas Laws Foldable First, fold your paper in half like this. Not this. You need six “flaps.” Cut only the top half of the folded paper. There are six flaps of information. Label the top of your flaps like below: Under flap 1 – Boyle’s Law P↑ P↓ V↓ V↑ Pressure and volume vary inversely when temperature remains constant 1 2 3 4 Under flap 1 – Boyle’s Law P1V1 = P2V2 •Pressures need to have the same units •Volumes need to have the same units 1 2 3 4 Under flap 2 – Charles’ Law T↑ V↑ T↓ V↓ Temperature and volume vary directly when pressure remains constant 1 2 3 4 Under flap 2 – Charles’s Law V1 = T1 V2 T2 V1T2 = V2T1 •Volumes need to have the same units •Temperatures both need to be in K (not °C or °F) 1 2 3 4 Under flap 3 – Gay-Lussac’s Law T↑ T↓ P↑ P↓ Pressure and temperature vary directly when volume remains constant 1 2 3 4 Under flap 3 – Gay-Lussac’s Law P1 = T1 P2 T2 P1T2 = P2T1 •Pressures need to have the same units •Temperatures both need to be in K (not °C or °F) 1 2 3 4 Under flap 4 – Combined Gas Law 1 Pressure, temperature, and volume can all change with the following equation. 2 3 4 Under flap 4 – Combined Gas Law P1V1 P2V2 = T1 T2 P1V1T2 = P2V2T1 •Pressures need to have the same units •Volumes need to have the same units •Temperatures both need to be in K (not °C or °F) 1 2 3 4 Under flap 5 – Dalton’s Law of Partial Pressures The total pressure of a gas is equal to the sum of the partial pressures of the individual gases 3 4 5 6 Under flap 5 – Dalton’s Law of Partial Pressures PT = P1 + P2 + P3 + … •All pressures must have the same units © Carey Munoz 3 4 5 6 Under flap 6 – Ideal Gas Law A law relating pressure, temperature and volume of an ideal gas 3 4 5 6 Under flap 6 – Ideal Gas Law PV = nRT •P is pressure (atm, kPa, mmHg, torr) •V is volume (mL, L) •n is number of moles •R is Ideal Gas Law Constant •T is temperature (K) Choose the R value based on the units for pressure. 3 4 5 6 Back side of foldable – Some helpful conversion factors & constants Standard Pressures 1 atm 760 mm Hg 101.325 kPa 101,325 Pa 14.7 psi 760 torr Common Volume Conversions 1 L = 1000 mL 1 cc = 1 mL = 1 cm3 Ideal Gas Constants (R) R= 0.0821 L*atm/mol*K R = 8.31 L*kPa/mol*K R = 62.364 L*mmHg/mol*K R = 62.364 L*torr/mol*K Temperature Conversions K = °C + 273 °C = (°F – 32) 1.8
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