Equilibrium Questions and Answers

caction PC s Hint PCI g PCL g Cl g The concentrations of the products at equilibrium are PC13 0 280 M and Cl 0 170 M What is the concentration of the reactant PCls at equilibrium K 0 0420 Check

7 4 points Which of the following is the correct equilibrium law for the following reaction N H4 8 6H2O2 8 2NO2 g 8H O g Ke 2NO 8H O N H6H O Ke NO 2 H O N H4 H O 6 N H H O NO H O Ke NO H O Ke N H H O INQ 121018

At a certain temperature the K for the decomposition of H S is 0 835 H S g H g S g Initially only H S is present at a pressure of 0 263 atm in a closed container What is the total pressure in the container at equilibrium Ptotal atm

2NO2 g 8H O g Which of the following is the correct equilibrium law for the following reaction N H4 8 6H2O2 8 Ke 2NO 8H O N H 6H O Ke NO 2 H O N H4 H O 16 N H H O NO H O8 Ke Kc Ke NO H O N H H O NO H O IN IT THE 16

Consider the reaction A aq 2B aq K 4 21 x 10 6 at 500 K If a 1 80 M sample of A is heated to 500 K what is the concentration of B at equilibrium B

At equilibrium the concentrations in this system were found to be N 0 0 100 M and NO 0 400 M N g O g 2 NO g If more NO is added bringing its concentration to 0 700 M what will the final concentration of NO be after equilibrium is re established NO final 0 2 Atte

An equilibrium mixture contains 0 250 mol of each of the products carbon dioxide and hydrogen gas and 0 200 mol of each of the rectants carbon monoxide and water vapor in a 1 00 L container CO g H O g CO g H g How many moles of carbon dioxide would have to be added at constant temperature and volume to increase the amount of carbon monoxide to 0 300 mol once equilibrium has been reestablished moles of CO mol

H g 1 g 2 HI g K 53 3 At this temperature 0 500 mol H and 0 500 mol I were placed in a 1 00 L container to react What concentration of HI is present at equilibrium HI 3 65 the equilibrium constant Ke for this reaction is 53 3 Incorrect M

stion 8 of 30 Consider the equilibrium reaction 2A B 4C After multiplying the reaction by a factor of 2 what is the new equilibrium equation new equilibrium equation Create the equilibrium constant expression K for the new equilibrium reaction K ICT Ar AF Answer Bank A B B C B C

For the reaction 8 H S g 8 H g Sg g the equilibrium concentrations were found to be H S 0 250 M H 0 420 M and Sg 0 750 M What is the equilibrium constant for this reaction Kc

Two reactions and their equilibrium constants are given A 2B 2C 2 CD K 2 29 K 0 158 Calculate the value of the equilibrium constant for the reaction D A 2B K

Calculate the value of Kp for the equation C s CO g 2 CO g given that at a certain temperature C s 2 H O g CO g 2 H g H g CO g H O g CO g Kp Kp Kpl 3 33 Kp2 0 645

Phosphorus pentachloride decomposes according to the chemical equation PCI g PCI g Cl g K 1 80 at 250 C A 0 2120 mol sample of PCI g is injected into an empty 2 15 L reaction vessel held at 250 C Calculate the concentrations of PCI g and PCI g at equilibrium PCI IPCL 0 0937 Incorrect presented by M 0 0937

At a certain temperature 0 620 mol SO is placed in a 3 00 L container 2SO3 g 2 SO g O g At equilibrium 0 130 mol O is present Calculate Kc Kc

The elementary reaction 2H O g 2H g O g proceeds at a certain temperature until the partial pressures of H O H and O reach 0 0850 atm 0 00600 atm 0 00450 atm respectively What is the value of the equilibrium constant at this temperature Kp

Ammonia can be synthesized from nitrogen and hydrogen N g 3 H g 2 NH3 8 AH and AS for this reaction are 91 8 kJ mol and 198 1 J mol K respectively Calculate the value of AG kJ mol at 525 K for a reaction mixture that consists of 6 atm N 9 atm H and 3 39 atm NH3 Enter your answer to 1 decimal place

The values of AH 298 K for SO g and SO3 g are 296 8 and 395 7 kJ mol respectively What is the value of AH 298 K per mole of SO for the following reaction 2SO g O g 2SO3 g A 98 9 kJ mol B 154 1 kJ mol C 185 2 kJ mol D 195 4 kJ mol E 204 6 kJ mol 11

Using the data given below calculate the approximate enthalpy change of reaction for this reaction CH g 2O g CO g 2H O g A 806 kJ mol B 918 kJ mol C 970 kJ mol D 994 kJ mol E 1018 kJ mol ww Bond enthalpy kJ mol C H 414 C C 347 C C 611 C O 351 C O 859 O H 463 O O 498 H H 436

At a particular temperature a 2 00 L flask at equilibrium contains 2 10 x 104 moles of N 2 50 x 105 moles of O2 and 2 00 x 10 2 moles of N O Calculate K at this temperature for the reaction 2N2 9 O2 9 2N O g K If N 2 00 x 104 M N O 0 200 M and 0 0 00138 M does this represent a system at equilibrium

e following equilibrium pressures were observed at a certain temperature for the reaction N 9 3H g 2NH3 g PNHS 4 1 x 10 2 atm PN 6 2 10 atm PH 1 4 x 10 3 atm Iculate the value for the equilibrium constant Kp at this temperature P PN 0 762 atm PNHS 0 0404 atm and PH B 0 00794 atm does this represent a system at equilibrium

At a particular temperature Kp N O4 9 2NO2 9 0 36 for the reaction a A flask containing only N O4 at an initial pressure of 2 1 atm is allowed to reach equilibrium Calculate the equilibrium partial pressures of Partial pressure of NO2 Partial pressure of N O4 atm atm

Be sure to specify states such as aq or s If a box is not needed leave it blank If no reaction occurs leave all boxes blank and click on submit e a net ionic equation for the reaction that occurs when aqueous solutions of potassium oxide and hydroiodic acid are combined

At 25 C the reaction 2NH3 g N2 g 3H g has K2 3 x 10 If 0 014 mol NH3 is placed in a 1 14 L container what will the concentrations of N and H be when equilibrium is established Make simplifying assumptions in your calculations Assume the change in NH3 concentration is insignificant if compared to initial value X Incorrect N i 0 91 X Incorrect M

At a particular temperature K 2 0 x 10 6 for the reaction 2CO g 2CO g O g If 4 0 moles of CO2 is initially placed into a 5 0 L vessel calculate the equilibrium concentrations of all CO Co 0 M M M

For the reaction PC15 9 PC13 9 Cl 9 at 600 K the equilibrium constant Kp is 11 5 Suppose that 3 220 g PC15 is placed in an evacuated 500 mL bulb which is then heated to 600 K a What would be the pressure of PC15 if it did not dissociate Pressure atm b What is the partial pressure of PC15 at equilibrium Partial pressure atm c What is the total pressure in the bulb at equilibrium Total pressure atm d What is the percent dissociation of PC15 at equilibrium Percent dissociation

he reaction H g Br2 g 2 HBr g 3 4 x 104 at 1494 K is the value of K for each of the following reactions at 14 2 HBr g H g Br2 g K H g Br2 g HBr g Kp HBr 9 H 9 Br 9 K

decomposition of hydrogen iodide on finely divided gold at 150 C is zero order with respect to HI The rate defined below is constant at 1 20 x 10 4 mol L s 2 HI g H g 1 g A HI At a If the initial HI concentration was 0 200 mol L calculate the concentration of HI at 25 minutes after the start of the reaction Concentration b How long will it take for all of the 0 200 M HI to decompose Time min Au Rate k 1 20 x 10 4 mol L s M

Current Attempt in Progress During an experiment 0 288 mol of H and 0 288 mol of 12 were placed into a 1 75 liter vessel where the reaction H g 12 g 2HI g came to equilibrium For this reaction K 49 5 at the temperature of the experiment What were the equilibrium concentrations of H2 I2 and HI H i 1 i M M

C s CO g 2CO g At equilibrium a 4 50 L container has 2 6 g of carbon CO2 at a partial pressure of 0 0027 atm and a total pressure of 1 31 atm Calculate Kp for this rea 1130 C S

3 At a certain temperature Kc 0 500 for the reaction SO3 g NO g NO g SO g Incorrect If 0 100 mol SO3 and 0 200 mol NO are placed in a 2 00 L container and allowed to come to equilibrium what will the NO2 and SO2 concentrations be NO SO i 0 022 0 072 M M Num Qu Nu Q M C

An equilibrium was established for the reaction CO g H O g COz g H2 g at 500 C This is an industrially important reaction for the preparation of hydrogen At equilibrium the following concentrations were found in the reaction vessel CO 0 127 M H O 0 0431 M CO 0 247 M and H 0 0900 M What is the value of K for this reaction

Current Attempt in Progress In air at 25 C and 1 00 atm the N concentration is 0 01 M and the Og concentration is 0 033 M The reaction N 8 O 8 2NO g has Kc 4 8 x 10 31 at 25 C Taking the N and O concentrations given above as initial values calculate the equilibrium NO concentration that should exist in our atmosphere from this reaction at 40 C K 1 6E 29 Make simplifying assumptions in your calculations Express your answer in scientific notation

At 25 C the reaction 2NH3 g N g 3H g has K 2 3 x 10 If 0 014 mol NH3 is placed in a 1 14 L container what will the concentrations of N and H be when equilibrium is established Make simplifying assumptions in your calculations Assume the change in NH3 concentration is insignificant if compared to initial value N i M

Kp 0 067 for the reaction N g 3H g 2NH3 g S at a certain temperature Suppose it was found that in an equilibrium mixture of these gases the partial pressure of NH3 g is 33 9 atm and the partial pressure of N is 6 56 atm What is the partial pressure of H g The partial pressure of H g atm

X Incorrect The decomposition of N O4 at 25 C N O4 g 2NO2 g has K 4 61 x 10 3 A 2 23 L vessel contained 0 0353 mol N O4 at equilibrium What was the concentration of NO2 in the vessel NO i 0 3 Jd Madia M

Current Attempt in Progress The decomposition of N O4 at 25 C N2O4 8 2NO 8 has K 4 61 x 10 A 2 23 L vessel contained 0 0353 mol N O4 at equilibrium What was the concentration of NO in the vessel

Consider the equilibrium PCI5 g 4H O g H3PO4 1 5HCI g How will the amount of H3PO4 at equilibrium be affected by decreasing the volume of the container holding the reaction mixture Only the gases will be affected by the volume of the container But the stoichiometric ratio of the reactants to products is i i so as the volume is changed the number of

Current Attempt in Progress Ethylene C2H4 and water react under appropriate conditions to give ethanol The reaction is C H4 8 H O g C H5OH g An equilibrium mixture of these gases at a certain temperature had the following partial pressures PC H40 533 atm PH O 2 37 atm PC H5OH 5 62 atm What is the value of Kp Kp TH

Current Attempt in Progress At 25 C K 9 1 x 1080 for the reaction 2H g O g 2H O g What is the value of Ke for the reaction H O g H g 1 2O2 g Express your answer in scientific notation Kc P

What is a homogeneous reaction A reaction where the reactants and products are in two or more phases V Select example s for a homogeneous reaction CaCO3 s CaO s CO g O4Fe s 302 g 2Fe2O3 s O2H g O g 2H O g O2HI g H g 12 8 O CaCO3 s 2HCl aq CaCl aq CO g H O l What is a heterogeneous reaction Select example s for a heterogeneous reaction 2H g O g 2H O g CaCO3 s CaO s COz g O2HI g H g 12 8 4Fe s 30 g 2Fe O3 s

A chemical reaction can be reversed if options The energy of the reactants exceeds the activation energy threshold The energy of the products exceeds the activation energy threshold The energy of the reactants is less than the activation energy threshold The energy of the products is less than the activation energy threshold

D F AG 16 kJ mol and K equilibrium constant 500 You add 10 000 moles of F to a test tube and let the reaction run undisturbed When it finally hits equilibrium you will have 20 moles of D and 9 980 moles of F 9 980 moles of D and 20 moles of F O moles of D and 10 000 moles of F 500 moles of each

A coffee cup at 90 C sits in a room that is at 22 C What item is more logical to label as the system What direction will heat flow Is this exothermic or endothermic Explain When will the heat transfer stop and what do we call this condition Which law of thermodynamics does this example most relate to

A solution is prepared by dissolving 21 1 g urea NH2 2 CO in 130 0 g water Calculate the boiling point of the solution Urea is a nonelectrolyte This problem requires values in your textbook s specific appendices which you can access through the OWLv2 MindTap Reader You should not use the OWLv2 References Tables to answer this question as the values will not match Boiling point C

3 Reminder include proper units for all problems For the following reaction it was found that at a particular instant bromine was being formed at the rate of 0 039 M s At that instant 5Br aq BrO3 aq 6H aq 3Br2 aq 3H O 1 RateH 0 a At what rate was the water being formed b At what rate was the bromine ion being oxidized c At what rate was H being consumed RateBr RateH

10 102 For each of the following 10 2 10 3 1 HCN 2 NH a Write the formula for the conjugate base b Which is the stronger acid

Which of the following would dissolve Pb OH 2 more than pure water A Buffer solution having pH 6 C 0 01 M NH4OH solution B 0 01 M PbCl2 solution D All of the above

If the pressure on the equilibrium system Nagi Ozgi A the quantity of N2 g decreases C the quantity of NO g decreases B the quantity of NO g increases D the quantities in the system do not change The quantity of Oag decreases The quantities in the system do not change The quantity of Oag increases The quantity of Nag decreases The quantity of NO increases The quantity of Nag increases The quantity of NO decreases H 2NO g decreases what happens Mark all that apply

Predict the equilibrium concentration of O in the reaction described below by constructing an equilibrium expression for Qc constructing an ICE table writing an equilibrium expression for Kc and solving for the equilibrium concentration Complete Parts 1 4 before submitting your answer N g O g 2 NO g NEXT In a 1 0 L container at high temperature 0 20 mol N and 0 15 mol O are allowed to react Set up the expression for Qc Each reaction participant must be represented by one tile Do not combine terms Once the expression is constructed solve for Qc to determine the direction of the reaction Qc 2 3 4

Some aqueous solutions are given below Find the solution whose pH changes maximum by adding 10 millimoles amount of pure H SO4 100 mL 0 1 M HCI 100 mL 0 5 M Ca OH 2 O 100 mL 0 1 M Ca OH 2 100 mL 0 4 M H S 100 mL 0 1 M NaOH 100 mL 0 2 M K SO4 O 100 mL 0 5 M CH3COOH 100 mL 0 1 M Ba OH 2