Combined Gas Law

Key Questions

• How does the ideal gas law differ from the combined gas law?

  The combined gas law relates the variables pressure, temperature, and volume whereas the ideal gas law relates these three including the number of moles.

  The equation for the ideal gas law is PV/T = k

  P represents pressure, V represents volume, T temperature in kelvin
  k is a constant.

  The ideal gas PV= nRT
  Where P,V,T represent the same variables as in the combined gas law. The new variable, represents the number of moles.

  R is the universal gas constant which is
  0.0821 (Liters x atmospheres/mol x Kelvin).

  You can rewrite equation as PV/nT =R

  
  
  

  Anthony F. · 1 · May 17 2014

• Question #1c8e8
• Question #bfabb
• If you want to solve for the volume of a gas (V2) and P1 is greater than P2, would you expect V2 to be larger or smaller than V1?
• How does the modern refrigerator take advantage of the gas laws to remove heat from a system?
• A certain sample of gas has a volume of 0.452 L measured at 87°C and 0.620 atm. What is its volume at 1 atm and 0°C?
• Which situations does the combined gas law enable you to do calculations when the other gas laws do not apply?
• A small research submarine with a volume of 1.2x10 ^5 L has an internal pressure of 1.0 atm and an internal temperature of 150°C. If the submarine descends to a depth where the pressure is 150 atm and the temperature is 30°C, what will the volume of the gas inside be if the hull of the submarine breaks?
• How is the combined gas law different from boyle's law?
• How does the pressure of an combined gas change as temperature increases?
• How does the ideal gas law differ from the combined gas law?
• How does pressure affect the combined gas law?
• What would be the equation for finding P2 given all the other parameters of the combined gas law?
• What are some common mistakes students make with the combined gas law?
• What are some examples of combined gases?
• What is an example of a combined gas law practice problem?
• Question #f0c8e
• Question #e9969
• Question #df4dd
• Question #5609e
• Question #675cd
• A gas has a volume of #"720.0 mL"# at #"20.0"^@"C"# and #"3.00 atm"#. What would the volume of the gas be at STP?
• Question #8ea79
• Question #6f8d8
• Question #d9f89
• Question #b6669
• Question #21f80
• Question #a4af0
• Question #812c3
• A gas occupies volume of 0.35dm3 at 290K and 92.558K Nm-2 pressure. Calculate the volume of gas at STP?
• A certain gas occupies a volume of 550.0 mL at STP. What would its volume be at 27°C and 125.0 kPa?
• If the initial pressure of a system was 1.00 atm and the volume was halved and the temperature in Kelvin was tripled, what is the final pressure?
• Question #621cc
• A sample of gas has a volume of 250 c#m^3# at 28.5 °C and 95.9 kPa. What volume will the gas occupy at STP?
• Question #4e962
• A sample of gas has a volume of 25 L at a pressure of 200 kPa and a temperature of 25°C. What would be the volume if the pressure were increased to 250 kPa and the temperature were decreased to 0°C?
• An #0.25*L# air bubble is released by a diver at a pressure of #2.4*atm#, and a temperature of #288*K#. What volume will it express at the surface with #T=300*K#?
• How does the volume of a gas change in a container of fixed volume upon cooling?
• Question #bd0ea
• What is the combined gas law?
• 500 mL of hydrogen at 27°C and 3 atmospheres pressure is compressed to 100 mL at 100°C. What is the new pressure in atmospheres?
• A #"2270 mL"# sample of gas has a pressure of #"570. mmHg"# at #"25"^@"C"#. What is the pressure when the volume is decreased to #"1250 mL"# and the temperature is increased to #"175"^@"C"#?
• Question #52ade
• Question #e05a9
• A sample of gas occupies a volume of 50.0 milliliters in a cylinder with a movable piston. The pressure of the sample is 0.90 atmosphere and the temperature is 298 K. What is the volume of the sample at STP?
• A sample of helium gas has a volume of 900 milliliters and a pressure of 2.50 atm at 298 K. What is the new pressure when the temperature is changed to 336 K and the volume is decreased to 450 milliliters?
• A quantity of #N_2# gas originally held at 4.75 am in a 1.00L container at 26°C is transferred to a 10.0 L container at 20°C. What is the total pressure in the new container?
• A 60.0 mL sample of #CO_2# gas is collected over water at 70.0° and 101.3 kPa. What is the volume of the dry gas at STP?
• What is the initial pressure of a gas having an initial temperature of 90.5K, an initial volume of 40.3 L, final pressure of .83 atm, a final temperature of .54 K and a final volume of 2.7L?
• Question #943f6
• 61.5L of oxygen at 18°C and an absolute pressure of 2.45 atm is compressed to 48.8L and at the same time the temperature is raised to 50°C . what is the new pressure of the gas?
• The compression and expansion of gases form the basis of how air is cooled by air conditioners. Suppose 1.55 L of an ideal gas under 6.38 atm of pressure at 20.5°C is expanded to 6.95 L at 1.00 atm. What is the new temperature?
• The volume of a bicycle tire is 1.35 liters and the manufacturer recommends a tire pressure of 8.5 atm. If you want the bicycle tire to have the correct pressure at 20.0°C, what volume of air is required at STP?
• Question #9c03e
• A 3.00 liter sample of gas is at 288 K and 1.00 atm. If the pressure of the gas is increased to 2.00 atm and its volume is decreased to 1.50 liters, what will be the Kelvin temperature of the sample?
• Question #afa15
• The pressure of 4.2 L of nitrogen gas in a flexible container is decreased to one-half its original pressure, and its absolute temperature is increased to double the original temperature. What is its volume now?
• The pressure of 250 kPa acting on 15 cubic meters of gas at a temperature of 100 K is increased to 500 kPa and the volume is increased to 30 cubic meters. What is the temperature of the gas at this new pressure and volume?
• Fifty liters of gas is kept at a temperature of 200 K and under pressure of 15 atm. The temperature of the gas is increased to 400 K. The pressure is decreased to 7.5 atm. What is the resulting volume of the gas?
• Question #ee73c
• During an experiment, 30 mL of a gas is collected at 401 kPa. What will the volume be at standard pressure?
• A chemist collects 156 mL of carbon dioxide gas at 25°C and 790 torr. What would the volume of the carbon dioxide be at STP?
• What are the #"Noble Gases"#?
• Question #aa422
• What is the temperature of 350 mL of gas at .85 atm if it has a volume of 920 mL at STP?
• Question #68da5
• Question #00280
• A sample of gas has a volume of 240. L at 4.00 atm of pressure and a temperature of 1091K. What is the volume at STP?
• Question #6ff98
• A sample of an ideal gas has a volume of 2.34 L at 279 K and 1.10 atm. What is the pressure when the volume is 1.78 L and the temperature is 304 K?
• An ideal gas in a sealed container has an initial volume of 2.70 L. At constant pressure, it is cooled to 19° C where its final volume is 1.75 L. What was the initial temperature?
• How do you express 275 mmHg in atm. and Pascal?
• A weather balloon has a maximum volume of #7.50 * 10^3# #L#. The balloon contains #195# #L# of helium gas at a pressure of #0.993# #atm#. What will be the pressure when the balloon is at maximum volume?
• What volume will 500 mL of gas at 20°C and a pressure of 420 mm Hg occupy if the temperature is reduced to -80°C and the pressure is increased to 650 mm Hg?
• A gas has a pressure of 710 kPa at 227°C. What will its pressure be at 27.0°C, if the volume doubles?
• A gas at 52°C occupies 6.8 L at a pressure of 1.5 atm. What will the pressure be at -43°C if the volume is reduced to 2.2 L?
• A gas has a volume of 400 mL at STP. If the temperature is held constant, what volume would the gas occupy at room temperature of 1.5 atm?
• A gas has a volume of 3.3 L at 25°C and 1.3 atm; at what temperature would the gas occupy 2.5 L at 1 atm?
• Question #544cf
• A helium-filled balloon has a volume of 100 L at 25°C and 900 mmHg. What volume will it have at 180 kPa and 20°C?
• How many moles of gas exist for a volume of #0.125*L# collected over water at #298*K# at a pressure of #747*mm*Hg#?
• A gas has a volume of 4.5 L at STP. If the conditions are changed to SATP, what is the new volume of the gas?
• Vessel A contains O2 gas at 25C and 1.0 atm. Vessel B contains CO2 gas at 10.0C and 0.75 atm. Both vessels have the same volume. Answer each of the following?
• How does the volume occupied by a gas vary with (i) pressure, and (ii) temperature?
• If a tire has a pressure of 11.9 Pa, a volume of 2.8 L at a temperature of 319 K, and the pressure increases to 13.4 kPa when the temperature rises to 325 K, what is the new volume of the tire?
• If I initially have a gas at a pressure of 12 atm, a volume of 23 liters, and a temperature of 200 K, and then l raise the pressure to 14 atm and increase the temperature to 300 K, what is the new volume of the gas?
• A 12.0 L sample of gas is at STP. What would be its new volume if its pressure was decreased to 575 mmHg and its temperature was doubled?
• Question #1c72d
• What is the volume of #"0.220 mols"# of carbon monoxide gas found at STP?
• A 350 mL sample of air collected at 35°C has a pressure of 550 torr. What pressure will the air exert if it is allowed to expand to 425 mL at 57°C?
• What is the resulting temperature if a sample of gas began with a temperature of 20 C, 1 liter, and 760 mmHg and now occupies 800 mL and has a pressure of 1000 mmHg?
• If 17 L of a gas at a temperature of 67°C and a pressure of 88.89 atm has its temperature increased to 94°C and its volume decreased to 12 L, what is the new pressure?
• A mole of gas at O°C and 760mmHg occupies 22.41 L. What is the volume at 20°C and 760mmHg?
• A 5.00 L container contains #CH_4# at 35°C with a total pressure of 1.81 atm. What is the pressure of the gas when it expands to 25.0 L at 25°C?
• Question #4d7ef
• What is the proper form of the combined gas law?
• Question #75688
• If a balloon containing 3000 L of gas at 39 C and 99 kPa rises to an altitude where the pressure is 45.5 kPa and the temperature is 16 C, the volume ofthe balloon under these new conditions would be calculated using what conversion factor ratios?
• A gas at pressure of 5.0 bar from 0 to 546°c and simultaneously compressed to one third of its original volume.What will be the final pressure in bar?
• How do you calculate the final pressure of a gas that is compressed from a volume of #"20.0 dm"^3# to #"10.0 dm"^3# and cooled from #100^@"C"# to #25^@"C"# if the initial pressure is #"1 bar"# ?
• When a physician quotes a blood pressure, to what does this relate?
• Question #bfc24
• If the volume of an ideal gas at #"350 torr"# of pressure and #25^@ "C"# is #"450 L"#, at what temperature is its volume #"420 L"# and pressure #"830 torr"# in a sealed balloon?
• Question #4a240
• Consider the reaction #N_2(g) + 3H_2(g) rightleftharpoons 2NH_3(g)#. What is the effect of decreasing the volume on the combined gas?
• Question #8fca6
• A #73*mL# volume of gas enclosed in a piston at a pressure of #100*kPa#, and a temperature of #0# #""^@C# was heated to a temperature of #80# #""^@C# and the new volume occupied was #4530*mL#. What is the new pressure that the gas exerts?
• Question #2f974
• Question #f2a8d
• Question #c3048
• Question #4ee83
• Question #c4af6
• Question #5a3fa
• Question #26091
• What is the pressure of 0.250 mol of air contained in a balloon having a volume of 1.50 L at 35.0 °C?
• What do the combined gas law relate?
• Question #3d499
• A gas occupies 1676 mL at -85.1 °C and 225 mmHg. What will its temperature be when its volume is 838 mL at 3.5 atm?
• What is the difference between ideal gas equation and combined gas equation? Thank you
• What variable stays constant when using the combined gas law?
• A sample of propane, a component of LP gas, has a volume of 35.3 L at 315 K and 922 torr. What is its volume at STP?
• A sample of carbon monoxide occupies 2.44 L at 295.0 K and 771 torr. Find its volume at -47 degrees Celsius and 350 torr?
• If the volume of a gas is #5.9*mL# when #T=279.05*K# and #P=705.0*mm*Hg#, how will volume change when the gas is warmed to #332.8*K#, and the pressure is increased to #761.1*mm*Hg#?
• What happens to the volume of an ideal gas if the pressure halves and temperature doubles?
• #"2.50 L"# of a gas at #"303 K"# and #"100 kPa"# are heated. The new volume is #"3.75 L"# and the new pressure is #"90.0 kPa"#. What is the new temperature?
• If a gas in a balloon starts at #"2.95 atm"#, #"7.456 L"#, and #"379 K"#, what is the final pressure in #"torr"# for the gas when it compresses to #"4.782 L"# and #"212 K"#?
• Question #a68fa
• How we combine two these equations P1V1 = k and P2 V2 = k , I need to know the combination method?
• When the pressure of a gas is halved and its temperature is doubled, what happens to its volume?
• At conditions of 1.5 atm of pressure and 15.0 °C temperature, a gas occupies a volume of 45.5 mL. What will be the volume of the same gas at 1.1 atm and 30.0 °C?