Chemistry concepts and calculations

1. How many moles of CH3COOH would be required to produce a 2.5 M solution with

1. How many moles of CH3COOH would be required to produce a 2.5 M solution with a volume of 1.5 L? 2. How many grams of CCl4 would be used to produce a 2.0 M solution with a volum…

1. How many moles of CH3COOH would be required to produce a 2.5 M solution with

1. How many moles of CH3COOH would be required to produce a 2.5 M solution with a volume of 1.5 L? 2. How many grams of CCl4 would be used to produce a 2.0 M solution with a volum…

1. How many moles of K+ ions are present in 43.1 mL of a 0.621 M K3PO4 solution?

1. How many moles of K+ ions are present in 43.1 mL of a 0.621 M K3PO4 solution? 2. When aqueous solutions of (NH4)2CrO4 and Ba(NO3 )2 are combined, BaCrO4 precipitates. Calculate…

1. How many moles of K+ ions are present in 43.1 mL of a 0.621 M K3PO4 solution?

1. How many moles of K+ ions are present in 43.1 mL of a 0.621 M K3PO4 solution? 2. When aqueous solutions of (NH4)2CrO4 and Ba(NO3 )2 are combined, BaCrO4 precipitates. Calculate…

1. How many moles of N2 are contained in a 5000 mL tank at 428Kelvin and 2128 to

1. How many moles of N2 are contained in a 5000 mL tank at 428Kelvin and 2128 torr? A) 0.399 moles B) 1.10 moles C) 2.51 moles D) 0.455 moles E) 0.289 moles Hint PV nRT 62-y borr.…

1. How many moles of Si are there in a sample of Si that contains 1.82×10 24 ato

1. How many moles of Si are there in a sample of Si that contains 1.82×1024 atoms? ____moles What amount of the excess reagent remains after the reaction is complete? grams 3. For…

1. How many moles of atoms are contained in 21.0 g of Br 2 ? 2. 1.28 x 10 24 ato

1. How many moles of atoms are contained in 21.0 g of Br2 ? 2. 1.28 x 1024atoms of S. (Calculate the number of grams) 3. How many atoms are contained in (5 molecules CH3COOH) and …

1. How many moles of carbon dioxide, CO2, contains 8.25x10^23 molecules of carbo

1. How many moles of carbon dioxide, CO2, contains 8.25x10^23 molecules of carbon dioxide? The molar mass of carbon dioxide is 44.0095 grams per mole. Make sure to include the cor…

1. How many moles of gas must be forced into a 4.8 L tire to give it a gauge pre

1. How many moles of gas must be forced into a 4.8 L tire to give it a gauge pressure of 32.4 psi at 30 C? The gauge pressure is relative to atmospheric pressure. Assume that atmo…

1. How many moles of sodium hydroxide would have to be added to 125 mL of a 0.49

1. How many moles of sodium hydroxide would have to be added to 125 mL of a 0.498 M nitrous acid solution, in order to prepare a buffer with a pH of 3.100? 2. An aqueous solution …

1. How many moles of solute are present in each of the following solutions? A) 2

1. How many moles of solute are present in each of the following solutions? A) 275 mL of 2.50 M LiCl B) 25.0 mL of 0.600 M Na2SO4 2. How many mL of 0.0988 M HCl are needed to titr…

1. How many moles of water were in your sample of copper chloride hydrate? (2*1.

1. How many moles of water were in your sample of copper chloride hydrate? (2*1.008) + 16 = 18.02g/mol mass of H2O 0.2g water * (1m/18.02g) = 0.011099m reduced to 0.01 moles of wa…

1. How many neutrons in the element depicted above? Answer: 2. Choose the correc

1.    How many neutrons in the element depicted above? Answer: 2.    Choose the correct value for the total number of molecules in 5 g of sodium carbonate. Choose one answer. A. 7…

1. How many phase rule variables must be specified to fix the thermodynamic stat

1. How many phase rule variables must be specified to fix the thermodynamic state of each of the following systems? Show how you determine these. (i) A sealed flask containing liq…

1. How many significant figures are in 1009.630? 2. A spaceship on its way to an

1. How many significant figures are in 1009.630? 2. A spaceship on its way to another planet is traveling at a speed of 4200 miles per hour. How fast is this in units of millimete…

1. How many unpaired electrons are in the lithium atom? _________ This atom is .

1. How many unpaired electrons are in the lithium atom? _________ This atom is ... A. Paramagnetic B. Diamagnetic 2. How many unpaired electrons are in the zinc atom? ________ Thi…

1. How many ways are there to select 7 unordered elements from a set of three el

1. How many ways are there to select 7 unordered elements from a set of three elements when repetition is allowed? 2. How 18-letter strings can be made with three As, four Bs, two…

1. How might a-carnitine deficiency account for triacylglycerol accumulation in

1. How might a-carnitine deficiency account for triacylglycerol accumulation in the muscles? Would the lipid accumulate in the cytosol or mitochondria of the cells? Why? 2. Replac…

1. How might your results be affected if you neglected to triturate the solid pr

1. How might your results be affected if you neglected to triturate the solid prior to recrystallization? A. The product would not dissolve in the ethanol during recrystallization…

1. How much does the pH change when a strong acid is added to an equal mixture o

1. How much does the pH change when a strong acid is added to an equal mixture of H2PO4- and HPO4 -2 ? 2. How much does the pH change when a strong base is added to an equal mixtu…

1. How much energy (in kilojoules) is released when 33.0 g of ethanol vapor at 9

1. How much energy (in kilojoules) is released when 33.0 g of ethanol vapor at 92.5 C is cooled to -12.0 C? Ethanol has mp = -114.5 C, bp = 78.4 C, Hvap = 38.56 kJ/mol and Hfusion…

1. How much energy does it take to boil a gallon of liquid water that is already

1. How much energy does it take to boil a gallon of liquid water that is already at 100ºC? Express your answer in kJ. Just enter the numerical value - don't put units in this case…

1. How much heat (in kJ) is evolved (under standard conditions) when 184.78 g of

1. How much heat (in kJ) is evolved (under standard conditions) when 184.78 g of copper reacts to form copper(II) oxide? 2. How much heat (in kJ) is evolved when 60.26 g of water …

1. How much heat is needed to raise the temperature of 1 gallon of water to 37 t

1. How much heat is needed to raise the temperature of 1 gallon of water to 37 to boiling? 2. Is it reasonable that this process would be done in one step or more than one step an…

1. How much heat is needed to warm 250.4 G of water from 22.6 degrees C to 75.8

1. How much heat is needed to warm 250.4 G of water from 22.6 degrees C to 75.8 degrees C given that the specific heat capacity of water is 4.184 Joules divided by Grams multiplie…

1. How much heat must be added to 30.0 g of water to raise the temperature of th

1. How much heat must be added to 30.0 g of water to raise the temperature of the water from 25.5°C to 47.2 °C? 2. What is the sign of the heat change for an exothermic reaction? …

1. How much of 5.0 M NaOH is needed to make 800 mL of 0.1 M NaOH? 2. A student t

1. How much of 5.0 M NaOH is needed to make 800 mL of 0.1 M NaOH? 2. A student titrated 10.00 mL HCL with standard NaOH in a 125 mL flask. The amount of NaOH needed was 24.50 mL. …

1. How the size of cations and anions compares to the size of their neutral atom

1. How the size of cations and anions compares to the size of their neutral atoms and explain why 2. Define the term isoelectronic (same # electrons) and how the sizes of isoelect…

1. How will the equivalence point volume change if you titrate the two solutions

1. How will the equivalence point volume change if you titrate the two solutions in question 2? What is the pH of the equivalence point of the two solutions if you titrate with 0.…

1. How will you browse the WSDL definition of the Web service hosted at http://w

1. How will you browse the WSDL definition of the Web service hosted at http://www.devry.edu/web460/student.asmx? 2. What is meant by cookieless session management? 3. In ASP.NET …

1. How would 13C NMR spectrum of ferrocene differ from acetylferrocene? 2. How a

1. How would 13C NMR spectrum of ferrocene differ from acetylferrocene? 2. How are the IR spectrums of acetylferrocene and ferrocene different? 3. In the column chromatography dia…

1. How would the following actions effect both the yield AND the purity of your

1. How would the following actions effect both the yield AND the purity of your recrystallized trans-1,2-dibenzoyl ethylene a. The dichloromethane solution is not treated with act…

1. How would the observed molar mass of the unknown liquid have been affected by

1. How would the observed molar mass of the unknown liquid have been affected by the following circumstances. (would it be higher than the true value, lower than the value or rema…

1. How would the observed molar mass of the unknown liquid have been affected by

1. How would the observed molar mass of the unknown liquid have been affected by the following circumstances. (would it be higher than the true value, lower than the value or rema…

1. How would you tell whether another rock sample is igneous, sedimentary, or me

1. How would you tell whether another rock sample is igneous, sedimentary, or metamorphic in origin? What characteristics in the rock would help you know which type it is? 2. One …

1. Http was originally designed to be which means that web browsers stored no pe

1.   Http was originally designed to be    which means that web browsers stored no persistent data about a visit to a website. Hidden A.   Hidden B.   Encryptes C.      Stateless …

1. Human alcohol dehydrogenase (ADH) is a dimer with a mass of 80 kDa. A prepara

1. Human alcohol dehydrogenase (ADH) is a dimer with a mass of 80 kDa. A preparation of ADH was assayed in a 1-ml cuvet using UV/VIS spectrophotometer. The assay contained 10 mu l…

1. Hydrochloric acid + sodium oxalate 2. iron (III) perchlorate + aqueous ammoni

1. Hydrochloric acid + sodium oxalate 2. iron (III) perchlorate + aqueous ammonia 3. calcium chloride + ammonium carbonate 4. iron (II) iodide + sodium sulfide 5. mercury (II) chl…

1. Hydrochloric acid + sodium oxalate 2. iron (III) perchlorate + aqueous ammoni

1. Hydrochloric acid + sodium oxalate 2. iron (III) perchlorate + aqueous ammonia 3. calcium chloride + ammonium carbonate 4. iron (II) iodide + sodium sulfide 5. mercury (II) chl…

1. Hydrochloric acid and sodium hydroxide react as follows: (balance the equatio

1. Hydrochloric acid and sodium hydroxide react as follows: (balance the equation) HCl + NaOH --> H2O + NaCl a. If 2.5 moles of hydrochloric acid and 3.2 moles of sodium hydrox…

1. Hydrofluoric acid is a weak acid with a Ka = 6.8 x 10-4 . A titration of 25.0

1. Hydrofluoric acid is a weak acid with a Ka = 6.8 x 10-4 . A titration of 25.0 mL of 0.500 M hydrofluoric acid is carried out using 0.200 M NaOH. a. What is the initial pH of th…

1. Hydrofluoric acid, HF (aq), cannot be stored in glass Silicates in the glass

1. Hydrofluoric acid, HF (aq), cannot be stored in glass Silicates in the glass are attacked by the HF (aq). Sodium silicate example, reacts as follows: bottle s because compounds…

1. Hydrogen cyanide (HCND is a very weak acid (K, 62 x 1010) when dissolved in w

1. Hydrogen cyanide (HCND is a very weak acid (K, 62 x 1010) when dissolved in water. It a 50 mL sample of 0.100 M HCN is titrated with 0.100 M NaOH, calculate the pH of the solut…

1. Hydrogen produced in the following reaction is collected over water at 23oC a

1. Hydrogen produced in the following reaction is collected over water at 23oC and 742 Torr: 2Al + 6HCl --> 2AlCl3 + 3H2 What volume (mL) of the gas will be collected in the re…

1. Hydrogen sulphide (H 2 S) occurs in the atmosphere naturally at a concentrati

1. Hydrogen sulphide (H2S) occurs in the atmosphere naturally at a concentration of 0.05 ppb. Determine whether or not this concentration represents equilibrum with respect to H2O…

1. Hyperbaric oxygen chambers are used to treat divers suffering from decompress

1. Hyperbaric oxygen chambers are used to treat divers suffering from decompression sickness (the “bends”) with pure oxygen at greater than atmospheric pressure. What is the press…

1. I don\'t understand why you need to scan the voltage postively for oxidative

1. I don't understand why you need to scan the voltage postively for oxidative reactions, and negatively for reductive reactions. Is it because the more the negative voltage, the …

1. I have a compound that is 1-cyclopentene and a single bond of ch2br is attach

1.  I have a compound that is 1-cyclopentene and a single bond of ch2br is attached to the double bond of the ring (I'm not quite sure of the IUPAC naming of the compound).  I'm p…

1. I have given graph and I need to find the entropy ( delta S) and enthalpy ( d

1. I have given graph and I need to find the entropy ( delta S) and enthalpy ( delta H) from the graph. I know ( delta H ) is the y-intercept, so how can I find (delta S). Do I ne…

1. I need to predict my products. 2. Show the redox Reactions. 3. Show Balanced

1. I need to predict my products. 2. Show the redox Reactions. 3. Show Balanced Net Ionic Equations. KMnO4+H2SO4+FeSo4 ---> KMnO4+ NaOH+ FeSO4 ---> KMnO4+H2SO4+K2C2O4 ---&gt…