ࡱ> { bjbjzz .>nn8ThR@LLLLL;;;???????$BD?];;;;;?LL @;.LL?;?;0)?LZ;i<$u?"@0R@<@zEczEH)?zE)?L;;;;;;;??;;;R@;;;;zE;;;;;;;;;n : Unit 4 Name _______________________________ # ________ Section 1: Pressure conversions Convert 755 Torr to atmospheres. Convert 15.3 psi to atmospheres. Convert 24.3 mmHg to Torr. Convert 463.1 mmHg to bars. Convert 35psi to inHg. Convert 14.7 psi to bar. Convert 14.7 bar to kPa Convert 0.03kPa to Pa. Section 2: Pressure in Manometers According to the diagram of closed-ended manometers below:  What must be true about A? __________________ Which of the manometers contains the gas with the highest pressure? ___ If A was open-ended instead, what would be true about it? ________________________________________________ Calculate the pressure of a gas in kPa if a sample in a closed end manometer has a change in Hg height of 76.9 mm Hg. In an open end manometer the Hg level is 22.5 mm Hg higher in the arm attached to the gas sample. Calculate the gas pressure in atm if the atmospheric pressure is 1146.5 mb. Calculate the gas pressure (in mm Hg) in an open end manometer where the Hg level is 35mm higher in the atmospheric arm if the atmospheric pressure is 30.25 in Hg. Section 3: Partial Pressures The gas from an erupting volcano had the following composition: 65.0% CO2, 25.0% H2, 5.4% HCl, 2.8% HF, 1.7% SO2, and 0.1% H2S. What are the partial pressures of each gas if the total pressure is 760.0 mm of Hg? A container of gases consists of the following mixture of gases: 2.0 moles of helium, 6.0 moles of carbon dioxide, 10.0 moles of neon, and 12.0 moles of xenon. If the total pressure is 900.0 mm of Hg, determine the partial pressure of each gas. A sealed tank contains the following mixture of gases: 2.0 grams of helium, 48.0 grams of oxygen, 14.0 grams of nitrogen, 64.0 grams of sulfur dioxide, and 9.0 grams of hydrogen gas. If the total pressure is 800.0 kPa, then find the partial pressure of each gas. Nitrogen is collected over water at 21.5(C (vapor pressure is 18.7 mm Hg). What is the partial pressure of nitrogen if the atmospheric pressure is 99.4 kPa? Argon is collected over water at 30(C (vapor pressure is 31.8 mm Hg). Find the pressure of the dry gas if the barometric pressure is 0.975 atm. Section 4: Ideal Gas Law Complete the following statements by determining whether a decrease or increase will occur: The volume of a gas will ___________________________ if its temperature is increased. The temperature of a gas will ________________________ if its volume is decreased. The pressure of a gas will _________________________ if its volume is decreased. The volume of a gas will __________________________ if its pressure is increased. If I have 4 moles of a gas at a pressure of 5.6 atm and a volume of 12 liters, what is the temperature? If I have an unknown quantity of gas at a pressure of 1.2 atm, a volume of 31 liters, and a temperature of 87 C, how many moles of gas do I have? If I contain 3 moles of gas in a container with a volume of 60 liters and at a temperature of 400 K, what is the pressure inside the container? If I have 7.7 moles of gas at a pressure of 0.09 atm and at a temperature of 56 C, what is the volume of the container that the gas is in? If I have 17 moles of gas at a temperature of 67 C, and a volume of 88.89 liters, what is the pressure of the gas? If I have an unknown quantity of gas at a pressure of 0.5 atm, a volume of 25 liters, and a temperature of 300 K, how many moles of gas do I have? If I have 21 moles of gas held at a pressure of 78 atm and a temperature of 900 K, what is the volume of the gas? If I have 1.9 moles of gas held at a pressure of 5 atm and in a container with a volume of 50 liters, what is the temperature of the gas? If I have 2.4 moles of gas held at a temperature of 97 C and in a container with a volume of 45 liters, what is the pressure of the gas? If I have an unknown quantity of gas held at a temperature of 1195 K in a container with a volume of 25 liters and a pressure of 560 atm, how many moles of gas do I have? If I have 0.275 moles of gas at a temperature of 75 K and a pressure of 1.75 atmospheres, what is the volume of the gas? If I have 72 liters of gas held at a pressure of 3.4 atm and a temperature of 225 K, how many moles of gas do I have? Section 5: Gas Stoichiometry What volume of nitrogen gas is needed to react completely with magnesium to form 75 grams of magnesium nitride at a pressure of 1.25 atm and a temperature of 20C. If 4.0 liters of nitrogen reacts with 10.0 liters of hydrogen at STP what is the mass (in grams) of Ammonia, NH3, produced? PCl5 when heated decomposes into chlorine gas and phosphorus trichloride. If 45 liters of chlorine gas is produced at STP what is the mass of PCl5 required to do this reaction? What volume of water vapor would be produced from the complete reaction of 25 grams of hydrogen with excess oxygen at STP? Section 6: Gas Stoichiometry The following problems deal with reactions that occur at STP: Carbon monoxide reacts with oxygen to produce carbon dioxide. If 1.0 L of carbon monoxide reacts with oxygen at STP, how many liters of oxygen are required to react? how many liters of carbon dioxide are produced? Acetylene gas (C2H2) undergoes combustion by reacting with oxygen to produce carbon dioxide and water vapor. How many liters of C2H2 are required to produce 75.0 L of CO2? What volume of H2O is produced? What volume of O2 is required? If liquid carbon disulfide (CS2) reacts with 450 mL of oxygen to produce the gases carbon dioxide and sulfur dioxide at STP, what volume of each product is produced? Assume that 5.60 L of hydrogen gas at STP reacts with copper (II) oxide according to the following balanced equation: CuO (s) + H2 (g) ( Cu (s) + H2O (g) How many moles of H2 react? How many moles of copper are produced? How many grams of copper are produced? Assume that 8.5 L of iodine gas (I2) are produced at STP according to the following balanced equation: 2 KI (aq) + Cl2 (g) ( 2 KCl (aq) + I2 (g) How many moles of I2 are produced? How many moles of KI were used? How many grams of KI were used? Solid iron(III) hydroxide decomposes to produce iron(III) oxide and water vapor. If 0.75 L of water vapor are produced at STP, how many grams of iron(III) hydroxide were used? how many grams of iron(III) oxide were produced? Solid iron reacts with sulfuric acid to produce iron(II) sulfate and hydrogen gas. If 650 mL of hydrogen gas are collected at STP, how many grams of iron(II) sulfate are also produced? Assume that 13.5 grams of solid aluminum react with HCl according to the following balanced equation at STP: 2 Al (s) + 6 HCl (aq) ( 2 AlCl3 (aq) + 3 H2 (g) How many moles of Al react? How many moles of H2 are produced? How many liters of H2 are produced? The following problems deal with reactions that do not occur at STP: Ammonium sulfate, an important fertilizer, can be prepared by the reaction of ammonia with sulfuric acid according to the following balanced equation: 2 NH3 (g) + H2SO4 ( (NH4)2SO4 (aq) Calculate the volume of NH3 (in liters) needed at 20C and 25.0 atm to react with 150 kg of H2SO4. If 45.0 L of natural gas, which is essentially methane (CH4), undergoes complete combustion at 730 mm Hg and 20C, how many grams of each product are formed? Fritz Haber, a German chemist, discovered a way to synthesize ammonia gas (NH3) by combining hydrogen and nitrogen gases at extremely high temperatures and pressures. Write the balanced equation for this reaction. If 10 kg of nitrogen combines with excess hydrogen at 550C and 250 atm, what volume of ammonia gas is produced? A 3.25 gram sample of solid calcium carbide (CaC2) reacts with water to produce acetylene gas (C2H2) and aqueous calcium hydroxide. If the acetylene was collected over water at 17C and 740.0 mm Hg, how many milliliters of acetylene were produced? Section 7: Gas Density Problems Calculate the density of HCl at STP. Calculate the density of H2S at STP. Find the mass in grams of 1 liter of CH4 at STP. The mass of 1 liter of a gas at STP is 2.75 g. Calculate the molecular mass. The density of hydrogen is 9.00 x 10-2 g/L. What will be the mass of 100 liters? What volume will 1.5 x 1023 molecules of oxygen occupy at STP? Measured at STP, 33.6 liters of NO gas represents how many moles? The density of a elemental gas is 1.25 g/L at STP. What is the mass of 1 mole? What could this gas be? Section 8: Combined Gas Law A child receives a balloon filled with 2.30 L of helium from a vendor at an amusement park. The temperature outside is 311 K. What will be the volume of the balloon when the child brings it home to an air-conditioned house at 295 K? 1.00 L of a gas at standard temperature and pressure is compressed to 473 mL. What is the new pressure of the gas? A gas takes up a volume of 17 liters, has a pressure of 2.3 atm, and a temperature of 299 K. If I raise the temperature to 350 K and lower the pressure to 1.5 atm, what is the new volume of the gas? A small 2.00 L fire extinguisher has an internal pressure of 506.6 kPa at 25 oC. What volume of methyl bromide, the fire extinguishers main ingredient, is needed to fill an empty fire extinguisher at standard pressure if the temperature remains constant? I have an unknown volume of gas at a pressure of 0.5 atm and a temperature of 325 K. If I raise the pressure to 1.2 atm, decrease the temperature to 320 K, and measure the final volume to be 48 liters, what was the initial volume of the gas? On hot days, you may have noticed that potato chip bags seem to inflate, even though they have not been opened. If I have a 250 mL bag at a temperature of 19 C, and I leave it in my car that has a temperature of 60 C, what will the new volume of the bag be? A helium balloon has a volume of 500. mL at STP. What will be its new volume if the temperature is increased to 325 K and its P is increased to 125 kPa? A cylinder of argon gas contains 125 mol at a pressure of 150 atm and a temperature of 27C. After some of the argon has been used, the pressure is 136 atm at 27C. What mass of argon remains in the cylinder? A soda bottle is flexible enough that the volume of the bottle can change even without opening it. If you have an empty soda bottle (volume of 2 L) at room temperature (25 C), what will the new volume be if you put it in your freezer (-4 C)? Some students believe that teachers are full of hot air. If I inhale 2.2 liters of gas at a temperature of 18 C and it heats to a temperature of 38 C in my lungs, what is the new volume of the gas? Synthetic diamonds can be manufactured at pressures of 6.00 x 104 atm. If 2.00 liters of gas at 1.00 atm is compressed to a pressure of 6.00 x 104 atm, what would the volume of that gas be? If a gas has a volume of 3.00 L, a pressure of 740. Torr and a temperature of 310. K what will be its new temperature in oC if the pressure is increased to 1.50 atm while keeping the volume constant? 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 I raise the pressure to 14 atm and increase the temperature to 300 K, what is the new volume of the gas? Atmospheric pressure on the peak of Mt. Everest can be as low as 150 mm Hg, which is why climbers need to bring oxygen tanks for the last part of the climb. If climbers carry 10.0 liter tanks with an internal gas pressure of 3.04 x 104 mm Hg, what will be the volume of the gas when it is released from the tanks? A man heats a balloon in the oven. If the balloons initial volume is 0.4 liters and has a temperature of 20 C, what will the volume of the balloon be after he heats it to a temperature of 250 C? Section 9: Combined Gas Law If 400 cm3 of oxygen is collected at a pressure of 980 mmHg, what volume will the gas occupy if the pressure were changed to 940 mmHg? What is the volume of hydrogen at a pressure of 1.06 atm if 200 cm3 of hydrogen is collected at a pressure of 1.00 atm? The pressure on 2.50 L on anesthetic gas changes from 760 mmHg to 304 mmHg. What will be the new volume if the temperature remains constant? How hot will a 2.3 L balloon have to get to expand to a volume of 400 L? Assume that the initial temperature of the balloon is 25 C. A gas sample occupies 200 mL at 760 mmHg. What volume does the gas occupy at 400 mmHg? Nitrogen gas in a steel cylinder is under pressure of 150 atm at 27C. What will the pressure in the tank be if the tank is left in the sun and the internal temperature rises to 55C? If a sample of a gas occupies 6.8 L at 327C, what will be its volume at 27C if the pressure does not change? A gas occupies a volume of 560 cm3 at a temperature of 100C. To what temperature must the gas be lowered to if it is to occupy 400 cm3? Assume constant pressure. What temperature would a gas sample have if it started at 25C and it went from a pressure of 0.59 atm to 799 Torr, while the volume changed from 3.43 L to 99.8 mL, and the number of moles went from 3.1 to 12.2? If a balloon contains 0.75 mol of O2 at 28C and has a volume of 2.8 L, what will be the volume, in L, if an additional 16 g of O2 is added at the same temperature and pressure? A gas has a temperature of 14 C, and a volume of 4.5 liters. If the temperature is raised to 29 C and the pressure is not changed, what is the new volume of the gas? If I have 17 liters of gas at a temperature of 67 C and a pressure of 88.89 atm, what will be the pressure of the gas if I raise the temperature to 94 C and decrease the volume to 12 liters? If I have 21 liters of gas held at a pressure of 78 atm and a temperature of 900 K, what will be the volume of the gas if I decrease the pressure to 45 atm and decrease the temperature to 750 K? I have an unknown volume of gas held at a temperature of 115 K in a container with a pressure of 60 atm. If by increasing the temperature to 225 K and decreasing the pressure to 30 atm causes the volume of the gas to be 29 liters, how many liters of gas did I start with? Divers get the bends if they come up too fast because gas in their blood expands, forming bubbles in their blood. If a diver has 0.05 L of gas in his blood under a pressure of 250 atm, then rises instantaneously to a depth where his blood has a pressure of 50.0 atm, what will the volume of gas in his blood be? Section 10: Avogadros Law What is the volume in mL of 88.3 mg of carbon dioxide gas at STP? How many grams of gas must be released from a 45.2 L sample of N2 at STP to reduce the volume to 45.0 L at STP? Section 11: Grahams Law Helium effuses through a porous cylinder 3.20 times faster than a certain compound. What is the compounds molar mass? 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