Gaseous and liquid states Questions and Answers

15 2 points At constant T P is doubled and n is halved causing V to O increase O remain unchanged decrease

The volume of an ideal gas is inversely proportional to its pressure at a constant temperature and molar amount is a statement of Law Avogadro s Boyle s Charles s Dalton s O Amontons s

An unknown liquid has a normal boiling point of 338 K and a vapor pressure of 75 torr at 285 K Determine AHvap for the liquid

1 point Hydrochloric acid reacts with calcium carbonate to produce H CO3 and calcium chloride How many moles of HCI are required to react completely with 25 g of CaCO3 HCI aq CaCO3 H CO3 CaCl unbalanced 0 30 mol HCI 1 0 mol HCI 0 60 mol HCI 0 50 mol HCI

If I initially have a gas at a pressure of 0 12 atm a volume of 23 L and a temperature of 200 K and then I raise the pressure to 0 14 atm and increase the temperature to 300 K what is the new volume of the gas

A person reacts 6 86mol of nitrogen gas with 13 92mol of hydrogen gas What volume of ammonia NH3 is likely to form if the temperature of the reaction is 28 74 C and the pressure in the room is 2 49atm Reaction N2 g 3H2 g 2NH3 g You will be asked to upload a photo of your work for this problem

11 Which equation Q mc AT or Q mL Water changes from 20 C to 50 C Water melts A B C D E F A substance liquefies Water going from melting point to 10 C During a phase change During a change of temperature

If I place a balloon in my fridge that initially has a volume of 0 50 L and the volume of the balloon decreases to 0 42 L when it is fully cooled by my refrigerator what was the initial temperature of the balloon The temperature inside my refrigerator is about 277 K

Section Questions If two chemical samples both produce an orange flame upon testing which of the following is true Pick 1 1 Point The two samples contain identical compounds The samples both contain chlorine atoms The samples both contain calcium atoms The samples both contain potassium atoms

2 Assuming temperature remains constant the volume of a gas V varies inversely as its pressure P b What is the volume of the gas when the pressure is increased to 330 psi a What is the constant of proportionality if a container has a volume of 6 liters under a pressure of 220 psi

A sample of oxygen has a volume of 850 mL at 31 C and 266 torr What is the pressure of the gas in atmospheres at 69 C if the new volume is 450 mL 1 Using the named gas laws and Table 11 2 as your guide answer the following o Based upon the volume change V1 to V2 how do you expect the pressure to change P1 to P2 The pressure should go 2 Use the Combined Gas Law PIV1 T1 Based upon the temperature change T1 to T2 how do you expect the pressure to change P1 to P2 The pressure should go P2 P2V2 T2 When you rearrange the equation to solve for P2 what is the equation Each blank should contain a letter number combination format like P2 P1V1 T1 Convert T1 to kelvin units Convert T2 to kelvin units Convert P1 to units of atmospheres Write up or down in the blank Solve for P2 in atmospheres Write up or down in the blank K K atm atm

Consider the following system at equilibrium where AH 198 kJ and K 34 5 at 1 15x10 K 250 g O g 2503 9 If the VOLUME of the equilibrium system is suddenly increased at constant temperature The value of K The value of Qc The reaction must A increases B decreases C remains the same A is greater than Ke B is equal to Ke C is less than Ke A run in the forward direction to reestablish equilibrium B run in the reverse direction to reestablish equilibrium C remain the same It is already at equilibrium The number of moles of O will A Increase B decrease C remain the same

Compare the following Acid 1 phosphoric acid H3PO4 Acid 2 hydrogen carbonate ion HCO3 Acid 3 sulfurous acid H SO3 What is the formula for the weakest acid

A 15 mL sample of nitrogen at 38 C and 2 2 atm is heated to 42 C and the pressure changed to 1 4 atm What volume in mL does the gas occupy at this final temp and pressure Answer mL N

A student has a sample of 1 26 moles of fluorine gas that is contained in a 21 9 L container at 298 K What is the pressure of the sample The ideal gas constant is 0 0821 L atm mol K Round your answer to the nearest 0 01 and include units Your Answer

When ice is heated the particles start to vibrate as the particles increases Othermal energy O potential energy kinetic energy O heat energy

Suppose that 4 69 g of a silver salt AgX is dissolved in 715 0 mL of water A current of 3 07 A applied for 1160 s is required to plate out all of the silver in solution What is the mass percentage of silver in the salt mass precentage What is the chemical formula of the salt AgCN AgNO3 AgCl AgI AgF Ag

The horizontal lines on a cooling curve represent I A temperature change II A constant temperature III A change of state OI and II O lalone Oll alone

Which of the following has higher kinetic energy 1 g of steam 1 g of water O 1 g of ice O1 g of melting ice

Name Water s Grain alcohol O Water Methanol Steam O Grain alcohol O Methanol Specific heat capacity J g S 2 10 2 4 2 92 2 02

dentify the correct statement 4 O London dispersion force is strongest among the intermolecular forces Water is a polar solvent and it can dissolve all the compounds Dipole dipole interaction is stronger than hydrogen bond Dissolution of ionic solutes in water is due to ion dipole interaction

When a solute such as ammonium sulfate is dissolved in a solvent like water one of the observed effects is O scattering of light beams by the solute particles in the solution O a decrease in the vapor pressure of the solvent O a decrease in the boiling point of the liquid an increase in the freezing point of the liquid an increase in the vapor pressure of the solute

A student weighs an empty flask and stopper and finds the mass to be 112 29 g She then adds 5 1 mL of an unknown liquid and heats the flask in a boiling water bath at 98 8 C After all the liquid is vaporized she removes the flask from the bath stoppers it and lets it cool After it is cool she momentarily removes the stopper then replaces it and weighs the flask and condensed vapor obtaining a mass of 112 80 g The volume of the flask is known to be 250 0 mL The absolute atmospheric pressure in the laboratory that day is 756 mm Hg a What was the pressure of the vapor in the flask in atm P b What was the temperature of the vapor in K T atm What was the volume of the flask in liters V L c What was the mass of condensed vapor that was present in the flask m 9 K d How many moles of condensed vapor were present The gas constant R is 0 0821 L atm K mol PV RT n moles e What is the mass of one mole of vapor 772 71 MM MM g mol

Gas Laws What is the mass in grams of 8 5 L of O at 37 8 C and 630 4 mmHg

What is the pOH of an aqueous solution of 0 379 M nitric acid POH

A sample of 1 34 moles of gas is in a 7 3 L container at 28 C What is the pressure of the gas in kPa Report your answer to 3 significant figures Do not include units

What is the hydronium ion concentration in an aqueous perchloric acid solution with a pH of 3 030 H30 M

True or False 1 mole of O2 and 1 mole of HF contain the same number of atoms O True False

Propane C3Hg reacts with oxygen to form carbon dioxide and water How many liters of CO2 are formed in this reaction when 50 5 g of propane reacts with oxygen at 35 6 C and 1 00 atm pressure Show your calculations with correct significant figures and units

Molar Mass of Gases At 50 C and 1 atm pressure 2 5 L of phosgene gas weighs 10 75 grams Question What is the molar mass of this gas Use correct units Show all calculations

What is the volume of 46 0 g nitrogen dioxide NO2 at STP 46 0 L O 10 0 L 12 5 L O22 4 L 35 0 L

The molecule PF3 is polar Select the IMF S that it can participate in dipole dipole London dispersion force OH bonding

A 50 50 gas mixture of two gases in one container has to be a 50 50 split of each quantity except Omass volume O pressure O moles

Consider the initial conditions of a gas O 11 5 atm O 0 637 atm Determine the missing value for the final pressure given the other final conditions O 255 atm O 1 89 atm O9 13 atm 143 atm Variable T O 18 6 atm V P Variable T V Initial Value 400 K 250 L 3 30 atm P Final Value 1170 K 130 L

Which two variables in the ideal gas law are directly proportional with volume PV nRT Number of moles n Pressure P Temperature

A sealed glass container contains 0 175 moles of CO2 gas and 0 935 moles of N gas What is the mole fraction of N in the glass contain Keep the answer with 3 decimal places Do not write unit in answer

18 4 points A gaseous element has a density of 7 872 g L when the temperature is 28 17 C and the pressure is 730 7 torr What is the molecular mass g mol of the gas Keep the answer with 2 decimal places Do not write unit in answer

32 protons 44 neutrons 32 electrons 01 59 11 Time Remaining 4 points A sealed glass container contains 1 58 moles of He gas and 2 63 moles of Ar gas If the total pressure inside the container is 0 787 atm wh partial pressure of He in the glass container Keep the answer with 3 decimal places Do not write unit in answer

Pressure and Density What is the pressure of a gas when 74 3 g of that gas density of 3 65g L at STP occupies 0 750 Lat standard temperature Give your answer in 3 significant figures

4 points How many liters of N gas at 1 03 atm and 27 54 C are produced by the decomposition of 151 3 g of NaN3 2NaN3 s 2Na s 3N g Keep the answer with 2 decimal places Do not write unit in answer Type your answer 4 points

A gas has a volume of 3 21 L at 32 05 C What will the volume in L of the gas be if its temperature is raised to 79 50 C while its pressure is kep constant Keep the answer with 2 decimal places Do not write unit in answer 10

4 1 point Water has a higher vapor pressure than oil True O False Previous

Charles s Gas Law How much will the volume of an ideal gas change when its temperature is decreased from 775 K to 48 C at 1 atm pressure

Reaction Stoichiometry What volume of H2 is formed at 25 C and 1 atm when 3 50 g of Al is treated with excess NaOH 2NaOH 2Al 6H O2NaAl OH 4 3H2 g Show all calculations below Give your answer in 3 significant figures

Reaction Stoichiometry Ammonia decomposes to nitrogen and hydrogen when in the presence of heated steel wool What is the final volume of the gas when 450 0 g of ammonia decomposes at 250 0 C and 25 0 atm pressure Give a balanced equation for the decomposition reaction and show your calculations Give your answer in 3 significant figures

Dalton s Law of Partial Pressures A 25 0 L cylinder of gas contains a mixture of 275 g CO2 750 g O2 and 2250 g of N2 What is the pressure in the flask in atmospheres at 25 0 C Show all calculations Give your answer in 3 significant figures

0 0 g of calcium nitrate is heated at 100 kPa and a temperature of 300 C at which temperature it ully decomposes Equation 2Ca NO3 2 s 2CaO s 4NO g O g Calculate the following a the volume of nitrogen dioxide evolved 5 81 L b the volume of oxygen evolved 1 45 L c the total volume of gas evolved 7361

alculate the decrease in temperature when 6 00 L at 20 0 C is compressed to 4 00 L 97 67 K

What is the molar mass of a gas with a density of 1 9 g L at 118 K and 1 atm Give your answer in 1 decimal Question 20 4 pts Pressure and Density What is the pressure of a gas when 74 3 g of that gas density of 3 65g L at STP occupies 0 750 Lat standard temperature

A 10 0 L Sam of a gas al 3 75 atm What is the volume of the gas Give your answer in 2 decimals Question 11 Charles s Gas Law 2 pts A 8 62 L sample of gas at 25 C is heated to 481 K at constant pressure What is the final volume