Gaseous and liquid states Questions and Answers

How many grams of Nitrogen gas are found in 22 4 L of Nitrogen gas 20 g 14 g 28 g 56 g

Describe the model of a gas proposed by the kinetic theory of gases O The gas particles neither attract nor repel one another A gas consists of hard super small or volumeless particles in random motion O The gas particles interact with each other O A gas consists of soft super small or volumeless particles in random motion

Explain how raising the temperature of a gas causes it to expand at constant pressure Select all true statements The change in temperature causes the kinetic energy of the molecules to decrease A molecule with a greater velocity strikes the container wall with less force than a molecule with lower velocity O Higher velocities cause the gas particles to strike the walls of the container with more force and this in turn cau the container to expand if a constant pressure is to be maintained The increase in temperature requires an increase in kinetic energy This can happen only if the gas velocities increase

Suppose a tank of oxygen enriched air prepared for scuba diving has a volume of 19 60 L and a pressure of 296 4 atm at 28 C How many grams of oxygen are present if all the other gases in the tank exert a partial pressure of 174 4 atm m O i g

At 43 0 C and a pressure of 794 torr a gas was found to have a density of 3 59 g L Calculate its molar mass

If the temperature of a gas increased from 100 K to 200 K and the volume of a gas decreased from 20 L to 10 L what is the new pressure if the original pressure was 100 kPa 200 kPa 400 kPa 50 kPa 100 kPa

A gaseous substance effuses twice as rapidly as sulfur dioxide gas The gas could be O hydrogen O carbon monoxide O methane O oxygen O helium

Carbon disulfide is an extremely flammable liquid It can be ignited by any small spark or even a very hot surface such as a steam pipe The combustion reaction is CS2 g 302 g CO2 g 2SO2 g When 11 0 g of CS2 are burned in excess oxygen how many liters of CO2 and SO2 are formed at 28 C and 883 torr volume of CO i volume of SO i L L

6 When oxygen and C3Hs react together it makes water and carbon dioxide Write the balanced chemical equation

8 How many atoms are in 896 grams of tungsten W

etween two samples of helium and neon at the same temperature which if any as the highest average kinetic energy and which if any has the highest average speed A Both helium and neon have the same average kinetic energy and the same average speed B Helium and neon have the same average kinetic energy but neon has a higher average speed C Helium and neon have the same average kinetic energy but helium has a higher average speed D Helium and neon have the same average speed but neon has a higher average kinetic energy

2 At 122 C a sample of gas has a pressure of 2 25 atm What will be its pressure at 25 degrees Celsius Know Need Formula Solve

6 A typical barometric pressure in Kansas City is 740 torr What is this pressure in atmospheres in millimeters of mercury and in kilopascals

Which statement about enthalpy and internal energy is not true O AH AH av O AE and AH are equal in value when there is no change in gas volume O AH accounts for work against the atmospheric pressure in an open system O AE is the value calculated in a bomb calorimeter

2 points When a reaction produces gaseous product and collected over water the collected gas is wet True False

37 3 points A vessel contains 2 9 g of helium gas molar mass 4 003 g mol and 8 8 g of neon gas molar mass 20 180 g mol has a total pressure of 104 kPa at 25 C What the partial pressure in kPa of helium gas Answer to 1 decimal place Type your answer

35 3 points A gas in a cylinder with a piston occupied a volume of 944 mL at 222 C The cylinder is cooled down to a temperature of 20 4 C What is the volume in mL of gas in the cylinder Answer in integer Type your answer

MISSED THIS Read Section 13 2 You can click on the Review link to access the section in your e Text Part A Which of the following mixtures are solutions Check all that apply D 0 salt and water mixture oil and water mixture sand sterling silver cup and water mixture

24 2 points Given a fixed amount of gas its volume is directly proportional to its temperature at constant pressure True False

20 2 points In a mixture of non interacting gases each individual gas exerts its own pressure to make up the total pressure of the gas mixture True False

34 3 points A gas stored in a container at 19 4 C has a pressure of 277 kPa is placed next to the fireplace The temperature increased to 67 9 What is the pressure of the gas inside the container Answer in integer Type your answer

Consider the reaction below P4 9 6 Cl g 4 PC13 g If 0 992 moles of P4 is mixed with 3 80 moles of Cl in a 9 08 L rigid reaction vessel what is the final pressure in the vessel after th reaction goes to completion The final temperature is 332 C Assume 100 yield 15 8 atm 8 68 atm 7 61 atm 13 9 atm 21 7 atm

36 3 points A fixed amount of gas in a cylinder with a movable piston has a volume of 638 mL at 27 9 C when the applied pressure is 115 kPa What is the volume in mL of the gas if the applied pressure and temperature are changed to 230 kPa and 79 6 C Answer in integer Type your answer

Sometimes in lab we collect the gas formed by a chemical reaction over water see sketch at right This makes it easy to isolate and measure the amount of gas produced Suppose the CO gas evolved by a certain chemical reaction taking place at 40 0 C is collected over water using an apparatus something like that in the sketch and the final volume of gas in the collection tube is measured to be 76 5 mL 15 Sketch of a gas collection apparatus collected gas water chemical reaction Calculate the mass of CO that is in the collection tube Round your answer to 2 significant digits You can make any normal and reasonable assumption about the reaction conditions and the nature of the gases

38 3 points Determine the volume in L of 18 7 g of chlorine gas molar mass 70 90 g mol at STP Given the ideal gas constant is 0 08206 L atm mol K Answer to 2 decimal places Type your answer

39 3 points A gas has molar mas of 72 90 g mol is placed in a cylinder of 329 mL at 0 959 atm and 86 7 C What is the mass of the gas in g Given R 0 08206 L atm mol K Answer to 2 decimal places Type your answer

6 2 points The rate of effusion of a gas is inversely proportional to the square root of its particles True False

7 It s a hot day in San Diego California and you decide that you really need a big gulp from 7 11 The initial temp of the coke you buy is 5 C at 764 mm Hg Your body temp is 37 C What will be the pressure on the air bubble when it hits your stomach in atm 1 atm 760 mm Hg Know Need Formula Solve

41 3 points Determine the root mean square velocity in m s of a gas that has molar mass of 131 0 g mol at 73 5 C Given R 8 314 J K mol Answer in integer Type your answer

of Tap Water of Tap Water C K 295 15K 22C Time Reaction Started 7 30 I regional Pressure atm 0 9986atm Volume of Air mL 39mL Table 3 Reaction Time Data Time Reaction Ended 7 36 after reaction mL 52mL Final Volume Initial Volume 13mL Total Reaction Time 6 minutes Using the Ideal Gas Law PV nRT calculate the grams of O produced in the reaction

9 7 Which sample contains more molecules 1 0 L of O at 330 K and 510 mm Hg or 1 5 L of H at 47 C and 1 8 atm Which sample weighs more There are two answers to this problem

SLO 6a Students should be able to solve simple gas law problems SLO 6c Questions Show your calculations on a separate sheet of paper Be sure to show A listing of the variables The gas law used Rearrangement of the gas law to solve for the unknown variable Work for conversions and final calculations of the answer See the videos posted in Blackboard for examples On the final exam you will be given the following reference information P V P V Boyle s law K C 273 P P2 T T Gay Lussac s law V V T T Charle s law P V P V2 T T2 Combined Gaw law 1 00 atm 101 325 Pa 14 7 psi 760 mmHg 61 A sample of hydrogen H gas at 127 C has a pressure of 2 00 atmosphere At ludrogen decrease to 0 25 atmosphere if

Which pure molecular substance will have the lowest vapor pressure at 25 C A CH3OH B CH3CH OH C CH3CH CH OH D CH3CH CH CH OH

12 5 points a Which will effuse through a hole faster Br g or C CH3 4 g Why

2 A 10 0 ml solution of H SO4 aq solution is titrated with 0 254 M NaOH aq The equivalence point of the titration is 47 35 mL wwwwww a What is the mass percent of H2SO4 aq in solution Assuming its density is 1 0 g mL

For the reaction 2PC13 1 O g 20PCl3 g AH 508 kJ mol and AS 178 J mol K at 298 K What is AG for this reaction AG AH TAS A 561 kJ mol B 504 kJ mol C 455 kJ mol D53 500 k l mol

6 points What pressure is needed to store 79 0 kg of methane gas CH4 inside a tank of volume 80 0L at a temperature of 25 0 C

which is true about 6 02x1023 a This number is the number of particles in a mole b This number is a very small number c This number is the mass of

Calculate the volume of 2 30 moles of gas exerting a pressure of 2 80 atm at 155 C Be sure to include the units and round your answer to the appropriate number of significant figures

6 A sample of nitrogen gas has a volume of 3 0 L at 25 degrees Celsius and 720 torr What would the volume be at STP Hint This is a combined gas law question

50 0 g of nitrogen gas N are kept under pressure in a 3 00 L container If the pressure is kept constant how many moles of nitrogen gas are present in the container if gas is added until the volume has increased to 5 00 L Which gas law should you use use A Avogadro s B Boyle s C Charles s

omplete the table by pairing each set of quantum numbers with the orbital it describes If the set of quantum numbers is not ossible label it as not allowed Use each orbital description as many times as necessary Orbital sf Quantum numbers n 1 6 1 me 0 n 4 6 2 me 2 n 2 1 me 1 n 3 6 2 me 3 n 5 l 3 me 1 5d 5s 4 3d 2p not allowed Answer Bank 2s 5f 3p 3s 1p 3 4p 4d Is 2d Sp 4s

A balloon has a volume of 5 9 L at a pressure of 0 936 atm What is the volume of the balloon in liters if the atmospheric pressure is reduced to 0 296 atm

References A sample of B H6 gas in a 35 0 mL container is at a pressure of 450 mm Hg and a temperature of 460 C If the gas is allowed to cool at constant volume until the pressure is 363 mm Hg what is the new temperature in C Temperature

1 point What does B represent in the energy diagram below Potential Energy A B C Reaction Coordinate Activation Energy Potential Energy Energy Released Energy Absorbed D

1 Complete the following table with or equal to zero Process An ideal gas is heated at constant volume An ideal gas is expanded into a vacuum 9

What volume is occupied by 5 8 g of propane gas C3Hg at 23 C and 1 15 atm pressure Volume L

8 What is the volume of 0 250 mol of oxygen gas at 20 0 degrees Celsius and 0 974 atm pressure

This question has multiple parts Work all the parts to get the most points Air in the trachea contains oxygen 19 4 carbon dioxide 0 4 water vapor 6 2 and nitrogen 74 0 If the pressure in the trachea is assumed to be 0 92 atm what are the partial pressures of these gases in this part of the body a b Pressure of O Pressure of CO Pressure of H O atm atm atm

References A 26 4 mL sample of ethylene gas C H4 has a pressure of 1 66 atm at 2 5 C If the volume is increased to 45 0 mL and the temperature is raised to 10 C what is the new pressure Pressure atm