版权所有：华东理工大学物理化学教研室 35 b). Charls’s Law- at constant p The variation of V with T V T = constant The volume of any gas should extrapolate to zero at θ = -273 ℃ or T= 0 K. 1.2 The gas laws — 1).Three important gas Laws
版权所有：华东理工大学物理化学教研室 35 b). Charls’s Law- at constant p The variation of V with T V T = constant The volume of any gas should extrapolate to zero at θ = -273 ℃ or T= 0 K. 1.2 The gas laws — 1).Three important gas Laws
版权所有：华东理工大学物理化学教研室 36 At a given pressure and temperature, the molar volume of a gas is approximately the same; the volume of a sample of gas i s p r o p o r t i o n a l t o t h e a m o u n t o f m o l e c u l e s present. Avogadro's principle: The equal volumes of gases at the same p r e s s u r e a n d t e m p e r a t u r e c o n t a i n t h e s a m e numbers of molecules. c). Avogadro’s Principle V = constant × n at constant T and p: V m = V n 1.2 The gas laws — 1).Three important gas Laws
版权所有：华东理工大学物理化学教研室 36 At a given pressure and temperature, the molar volume of a gas is approximately the same; the volume of a sample of gas i s p r o p o r t i o n a l t o t h e a m o u n t o f m o l e c u l e s present. Avogadro's principle: The equal volumes of gases at the same p r e s s u r e a n d t e m p e r a t u r e c o n t a i n t h e s a m e numbers of molecules. c). Avogadro’s Principle V = constant × n at constant T and p: V m = V n 1.2 The gas laws — 1).Three important gas Laws
版权所有：华东理工大学物理化学教研室 37 b). Charls’s Law p T = constant The pressure varies linearly with the temperature, and extrapolates to zero at T= 0 The variation of p with T 1.2 The gas laws — 1).Three important gas Laws
版权所有：华东理工大学物理化学教研室 37 b). Charls’s Law p T = constant The pressure varies linearly with the temperature, and extrapolates to zero at T= 0 The variation of p with T 1.2 The gas laws — 1).Three important gas Laws
版权所有：华东理工大学物理化学教研室 38 When combine the Boyle’s Law, Charle’s Law and Avogadro’s Principle, then: 2). The combined gas Law the perfect gas equation pV = constant × nT pV = nRT 1.2 The gas laws RT M m pV = pV m = RT
版权所有：华东理工大学物理化学教研室 38 When combine the Boyle’s Law, Charle’s Law and Avogadro’s Principle, then: 2). The combined gas Law the perfect gas equation pV = constant × nT pV = nRT 1.2 The gas laws RT M m pV = pV m = RT
版权所有：华东理工大学物理化学教研室 39 2). The combined gas Law the perfect gas equation A gas that obeys this Equation exactly under all conditions is called a perfect gas. A real gas behaves more like a perfect gas the lower the pressure, and is described exactly by this equation in the limit p → 0. pV = nRT 1.2 The gas laws
版权所有：华东理工大学物理化学教研室 39 2). The combined gas Law the perfect gas equation A gas that obeys this Equation exactly under all conditions is called a perfect gas. A real gas behaves more like a perfect gas the lower the pressure, and is described exactly by this equation in the limit p → 0. pV = nRT 1.2 The gas laws