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### El Estado Gaseoso - Page Text Content

FC: States of matter | Mayra Sanchez Cabral

1: Physical States of Matter Gas Phase | http://youtu.be/guoU_cuR8EE

3: Aclaracion Este e-libro fue preparado utilizando un material para ser utilizado durante una clase y por eso no tiene explicaciones completas sobre el tema ya que serian hechas por el profesor Mis excusas porque el material original esta en ingles y simplemente lo integre en forma de libro Gracias por su comprension

5: Variables that determine the gas state: - temperature (kelvin or absolute scale) - pressure (atm, mm Hg, torr) - volume (liter, mL) - molar amount of substance (mole)

6: Standard condition (STP) or standard temperature and pressure (0oC and 1 atm)

7: The effect of an unbalanced pressure | a)The pressure inside this can is the same as outside— the pressures are balanced, b)When a vacuum pump reduces the pressure inside the can, the unbalanced outside pressure quickly and violently makes the can collapse.

8: A mercury barometer The height h is proportional to the barometric pressure. For that reason, the pressure is often given as the height of the mercury column, in units of millimeters of mercury, mmHg. P = dgh d= 13.6 g/mL G= 981 cm/s2 | Pressure Measurement

9: Example The pressure of a gas in a flask is measured to be 797.7 mm Hg using a mercury-filled manometer. What is this pressure in pascals and atmospheres? | Solution Conversion to pascal 797.7 mmHg x 1.01325x105 Pa / 760 mm Hg = 1.064x105 Pa Conversion to atmospheres 797.7 mmHg x 1atm/760mmHg =1.050 atm

10: Exercise A gas in a container had a measured pressure of 57 kPa. Calculate the pressure in units of atm and mmHg See problems 5.31 and 5.32

11: EMPIRICAL GAS LAWS Boyle’s Law Relation P vs V (T,n= constants) Charles’s Law Relation V vs T (P,n= constants) Gay-Lussac’s Law Relation PvsT (V,n=constants) Combine gas law Relation P,V,T n=constant) Avogadro’s law

12: Boyle’s Law the volume of a sample of gas at a given temperature varies inversely with the applied pressure PV= constant

13: Boyle’s experiment

14: A.- When a 1.000 g sample of O2 gas at 0oC is place in a container at a pressure of 0.5 atm, it occupies a volume of 1.40 L B.- When the pressure is double to 1.0 atm, the volume is reduce to 0.70 L which is half of the first volume

15: Example A volume of air occupying 12.0 dm3 at 98.9 KPa is compressed to a pressure of 119.0 kPa. The temperature remains constant. What is the new volume? (9.97 dm3) Solution Vf = ViPi/Pf Vf = 12.0 dm3 x 98.9 kPa/119.0 kPa Vf = 9.97 dm3

16: Exercise A volume of carbon dioxide gas, CO2, equal to 20.0 L was collected at 23oC and 1.00 atm pressure. What would be the volume of carbon dioxide collected at 23oC and 0.830 atm? Similar problems: 5.33, 5.34, 5.35 and 5.36

17: Gay Lussac's Law The volume occupied by any sample of gas at a constant pressure is directly proportional to the absolute temperature

18: A) A 1.0 g sample of O2 at 100 K and 1.0 atm of pressure occupies a volume of 0.26 L B) When the absolute temperature of the gas is doubled to 200 K the volume of O2 doubles to 0.52 L

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