Tuesday
September 23, 2014

Homework Help: Science: Chemistry

Recent Homework Questions About Chemistry

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chemistry urgent
I think I balanced these equation right please check and let me know. i am suppose to complete and balance the equations representing the reactions. NaHCO3 (s) + HCL (aq) >>>> NaCl + 2CO+H2O CaCo3 (s) + HCL (aq)>>> CaCl + CO3H Thanks
Wednesday, April 23, 2014 at 2:34am

science-chemistry
We performed a titration with NaOH solution with KHP. Now I need to calculate the average molarity of NaOH based on this data Weight of khp= 0.1083 g Volume of naoh = 6.4 ml Then if i get this how do i get the molarity of ch3cooh totrated in naoh with the data Volume of ...
Wednesday, April 23, 2014 at 2:31am

Chemistry URGENT/DR BOB
Can someone may sure that I balanced the following groups of equations correctly. Write an equation to show how acetic acid reacts with water to produce ions in solution. C2H4O2 + H2O >>>>>>> H3O + C2H3O Write an equation for the neutralization of HCl and ...
Wednesday, April 23, 2014 at 2:26am

chemistry
what is the hydronium ion concentration of a 0.35M oxalic acid, H2C2O4. solution? for oxalic acid, ka1= 5.6x10^-2 and ka2=5.1x10^-5. Identify and calculate the concentrations for the representative species in solution.
Tuesday, April 22, 2014 at 11:47pm

chemistry
consider the following equilibrium. 4NH3(g) +3O2(g)<-> 2N2(g) + 6H2O(g) suppose 0.30mol of NH3 and 0.40mol of oxygen are added to a 5.0L container. If x mol of water is present at equilibrium, what is the equilibrium concentration of oxygen?
Tuesday, April 22, 2014 at 11:44pm

chemistry
Dinitrogen tetroxide decomposes to form nitrogen dioxide in a second order reaction: N2O4(g)-> 2NO2(g) At 400K, the rate constant for this reaction has been measured to be 2.9x10^8 L/mol*s.suppose 0.222 mol of N2O4(g) is placed in a sealed 41.7L container at 400K and ...
Tuesday, April 22, 2014 at 11:41pm

chemistry
what is the mass percent of an aqueous sodium hydroxide solution in which the molarity of NaOH is 4.37M? the density of the solution is 1.1655 g/mL.
Tuesday, April 22, 2014 at 11:37pm

chemistry
the metal gold, with an atomic radius of 144.2pm crystallizes in a face-centered cubic lattice. what is the density of gold?
Tuesday, April 22, 2014 at 11:34pm

chemistry
the autoionization of water, as represented by the equation below, is known to be endothermic. What can be correctly said of what occurs as the temperature of water is raised?(please explain) H2O(l)+H2O(l)<->H3O+(aq) + OH-(aq)
Tuesday, April 22, 2014 at 11:33pm

chemistry
which of the following solutes, dissolved in 1kg of water, would be expected to provide the fewest particles and to freeze at the highest temperature? (NH4)2SO4 , CaCl2, and/or NaCl.
Tuesday, April 22, 2014 at 11:29pm

chemistry
What will happen if 50mL of 0.022M Na2S2O3, 50mL of 0.010M AgNO3, and 50mL of 0.097M KCl are mixed together? For AgCl, ksp=1.8x10^-10 ; for Ag(S2O3)2^3-, Kf= 2.9 x 10^13.
Tuesday, April 22, 2014 at 11:17pm

CHEMISTRY
Thiosulfate ion S2O32− is oxidized by ioidine according to the following reaction. 2S2O32−(aq) + I2(aq) ¨ S4O62−(aq) + 2I−(aq). If in a certain experiment, 0.0020mole of thiosulfate ion is consumed in 1.0 L of solution in 1 second, what is the...
Tuesday, April 22, 2014 at 8:11pm

chemistry
What is the % yield of of a reaction in which 40.00g of tungsten(VI)oxide (WO3) reacts with excess hydrogen gas to produce metalic tungsten and 5.40mL of water. (assume the density of water is 1.00g/mL)
Tuesday, April 22, 2014 at 8:08pm

CHEMISTRY!
A 20.00 mL of 0.200mol/L magnesium chloride solution is added to a 95.00 mL of 0.800 silver (I) nitrate solution, and a precipitate is formed. a.Determine the concetration of the nitrate ions at the end of the reaction I was able to calculate the things and make an IRF table ...
Tuesday, April 22, 2014 at 7:03pm

Chemistry
Write the class/family of the following compounds and the functional group in each compound. a. 3-methylcyclohexene b. Cis-3-octene c. 4-methyl-2-heptanone d. 3-bromobenzaldehyde e. 3-bromo-5-chlorotoluene f. 3-chlorophenol g. 6-methyl-2-heptyne Please help!
Tuesday, April 22, 2014 at 6:31pm

chemistry
1)A sample of CO2 gas which weighs 0.85 grams has a volume of 1.30 liters when collected at 30°C. What would be the pressure of the gas sample? 2) A gas sample has an original volume of 600 ml when collected at 720 mm and 35°C. If a change is made in the gas ...
Tuesday, April 22, 2014 at 6:27pm

chemistry
A beaker with 1.40×102mL of an acetic acid buffer with a pH of 5.000 is sitting on a benchtop. The total molarity of acid and conjugate base in this buffer is 0.100 M. A student adds 7.10mL of a 0.370M HCl solution to the beaker. How much will the pH change? The pKa of ...
Tuesday, April 22, 2014 at 5:46pm

chemistry
How many grams of dry NH4Cl need to be added to 2.00L of a 0.100M solution of ammonia, NH3, to prepare a buffer solution that has a pH of 8.86? Kb for ammonia is 1.8×10−5.
Tuesday, April 22, 2014 at 5:41pm

Chemistry
Calculate empirical formula C=41.7%,H=6.2%,N=19.3%, and O=33.1% Thanks. any help at all will be awesome!
Tuesday, April 22, 2014 at 4:23pm

Chemistry pH
What is the pH of 4.7 M CH3NH3Cl. mehyl-amine, CH3NH2, Kb = 4.4 × 10-4. Do I find Ka first then take the -log(Ka) to find the pH of 4.7M CH3NH3Cl? or do I need to make I.C.E. table?
Tuesday, April 22, 2014 at 3:28pm

chemistry
how many grams of CO2 are produced when 88 grams of O2 are reacted with an excess of butane?
Tuesday, April 22, 2014 at 3:26pm

Chemistry
Estimate the solubility of calcium fluoride, CaF2+, (a) in moles per liter and (b) in grams per liter of pure water. CaF2+(s) = Ca2+(aq)+2f-(aq)
Tuesday, April 22, 2014 at 3:13pm

Chemistry
Calcium hydroxide, Ca(OH)2, dissolves in water to the extent of 1.78 g per liter. What is the value of Ksp for Ca(OH)2?
Tuesday, April 22, 2014 at 3:04pm

Chemistry
The part of an electrochemical cell that carries electrons to a reacting ion is a(n) (1) cathode (2) anode (3) electrode (4) electrolyte
Tuesday, April 22, 2014 at 2:37pm

Chemistry pH
What is the pH of a solution that contains 0.30 M HC2H3O2 and 0.95 M C2H3O2-? Use Ka = 1.8 × 10-5 for HC2H3O2.
Tuesday, April 22, 2014 at 12:37pm

Introduction to Chemistry
Hydrogen gas has a pressure of 765mm Hg, a volume of 355mL,and a temperature of 22 degrees C. What is the new volume of this gas if the pressure is 5.1atm,and at a temperature of 48degrees C?
Tuesday, April 22, 2014 at 12:22pm

Chemistry
Assuming an efficiency of 38.60%, calculate the actual yield of magnesium nitrate formed from 145.9 g of magnesium and excess copper(II) nitrate. I got 230.5g but it isn't right.. I got 6 mols of Mg then calculated molar mass of Mg(NO3)2 and got 148.31 and then multiplied ...
Tuesday, April 22, 2014 at 10:24am

Inorganic Chemistry
what is the product of reaction K3(Al(C2O4)3).3H2O with KMnO4 in the present of NaOH?
Tuesday, April 22, 2014 at 7:45am

water chemistry
35.0mL sample of 0.150M acetic acid9HC2H3O2)(Ka=1.8*10-5) is titrated with 0.150M NaOH solution. calculate the pH AFTER 17.5 Ml volumes of base have been added.
Tuesday, April 22, 2014 at 3:20am

Chemistry
PCl5 --> PCl3 + Cl2 A 0.318 mol sample of PCl5(g) is injected into an empty 4.15 L reaction vessel held at 250 °C. Calculate the concentrations of PCl5(g) and PCl3(g) at equilibrium.
Tuesday, April 22, 2014 at 2:31am

chemistry
Find the Qsp when 5 mL of 0.17 M K2 CO3 (aq) and 1 L of 0.013 M AgNO3(aq) are mixed together. The solubility product of Ag2CO3 is 6.2 × 10−12
Monday, April 21, 2014 at 9:54pm

Chemistry
Use intermolecular forces to explain why alkanes with 1-4 C are gases; 5-16 C are liquids; and greater than 16 C is solid
Monday, April 21, 2014 at 9:37pm

Chemistry
Prior to their phaseout in the 1980s, chemicals containing lead were commonly added to gasoline as anti-knocking agents. A 3.279 g sample of one such additive containing only lead, carbon, and hydrogen was burned in an oxygen rich environment. The products of the combustion ...
Monday, April 21, 2014 at 9:02pm

Chemistry
If a balloon filled with carbon dioxide has occupies a volume of 31 L at STP, what is the mass of the gas?
Monday, April 21, 2014 at 6:42pm

Chemistry
Hydrogen peroxide(H2O2) slowly decomposes to form water and oxygen gas. Calculate the mass of Hydrogen peroxide needed to obtain 0.460L of oxygen gas at STP
Monday, April 21, 2014 at 6:41pm

chemistry - (Dr. Bob222)
A student attempted to synthesize malonic acid which has a molecular weight of 104 g/mol by the same method used to synthesize aspirin. A titration was performed to find the equivalent weight. 0.125 g of malonic acid product was used for a titration that required 24 mL of 0.10...
Monday, April 21, 2014 at 5:17pm

chemistry
How much energy is needed to melt 25.4 grams od I2?
Monday, April 21, 2014 at 1:36pm

chemistry
If a patient.is asministered 255ml of iv sokution how many moles of K+ do the receive
Monday, April 21, 2014 at 12:46pm

Chemistry
using a coffee calorimeter, it is found that when an ice cube weighing 24.6g melts, it absorbs 8.19kJ of heat. calculate delta H for the phase change represented by the thermochemical equation: H2O(s) ->H2O(l)
Monday, April 21, 2014 at 11:16am

chemistry
I want to know if someone could let me know if I have written my balanced equations correct for the following questions. Write a balanced equation for the reaction of zinc with sulfuric acid. Zn + H2SO4 >>> Zn(S04) +H2 Write a balanced equation for the reaction of ...
Monday, April 21, 2014 at 10:00am

chemistry
Lactic acid (CHgCHOHCOgH) is found in sour milk, in sauerkraut, and in muscles after activity. (K, for lactic acid I 1.4 X 1074.) (a) If 2.75 g of NaCH3CHOHCO2,
Sunday, April 20, 2014 at 11:51pm

chemistry urgent
NH4NO3(s)+H2O(l)→NH4NO3(aq) ΔH = +25.7 kJ. What is the final temperature in a squeezed cold pack that contains 45.5g of NH4NO3 dissolved in 125 mL of water? Assume a specific heat of 4.18J/(g⋅∘C) for the solution, an initial temperature of 29.0∘C, ...
Sunday, April 20, 2014 at 11:49pm

chemistry
Where possible, classify these systems as reactant-favored or product-favored at 298 K. If the direction cannot be determined from the information given, classify the reaction as "Insufficient information". a)2A(g) + 3B(g) -->4C(g) delta H = -95kJ b)2A(g) + 2B(g...
Sunday, April 20, 2014 at 11:33pm

Chemistry
Calculate ΔG° for the following reaction at 298 K.? A+B --> 2D ΔH° = 775.0 kJ ΔS°=296.0 J/K C --> D ΔH° = 446.0 kJ ΔS°=-218.0 J/K A+B --> 2C ΔG° = ? kJ I know I am suppose to reverse the (C --> D) and add a ...
Sunday, April 20, 2014 at 11:25pm

Chemistry
If 2.5 g of NaOH is dissolved in 253 mL of water, what is the pH of the solution?
Sunday, April 20, 2014 at 11:24pm

Chemistry
How many mL of 0.49 M HCl will neutralize 42 mL of 1.48 M NaOH?
Sunday, April 20, 2014 at 11:23pm

Chemistry
What is the molarity of a solution of H3PO4 if 11.1 mL is neutralized by 33.2 mL of 0.161 M NaOH?
Sunday, April 20, 2014 at 11:22pm

Chemistry
What is the molarity of a NaOH solution if 21.3 mL of the NaOH solution is neutralized by 10.4 mL of 6.10 M H3PO4?
Sunday, April 20, 2014 at 11:21pm

Chemistry
Calculate ΔH∘f (in kilojoules per mole) for benzene, C6H6, from the following data: 2C6H6(l)+15O2(g)→12CO2(g)+6H2O(l) ΔH∘ = -6534kJ ΔH∘f (CO2) = -393.5kJ/mol ΔH∘f (H2O) = - 285.8kJ/mol
Sunday, April 20, 2014 at 11:12pm

Chemistry
If delta H°rxn and delta S°rxn are both positive values, what drives the spontaneous reaction and in what direction at standard conditions? The spontaneous reaction is a)enthalpy driven to the left. b)entropy driven to the right. c)entropy driven to the left. d)...
Sunday, April 20, 2014 at 9:32pm

Chemistry
Assuming that the specific heat of the solution is 4.18 J/(g⋅∘C) and that the calorimeter itself absorbs a negligible amount of heat, calculate ΔH in kilojoules for the reaction CaO(s)+H2O(l)→Ca(OH)2(aq) When 1.045 g of CaO is added to 50.0 mL of water ...
Sunday, April 20, 2014 at 8:58pm

chemistry
What are the products of the reaction between nitrous acid and strontium hydroxide?
Sunday, April 20, 2014 at 7:11pm

chemistry
HCL acid is available as a stock solution with a concentration of 10 mol/L. If you need (9.0*10^-1) L of (2.50*10^0) mol/L hydrochloric acid, approximately how much distilled water will you need to make the dilution?
Sunday, April 20, 2014 at 6:34pm

chemistry
If 2.33 L of propane (C3H8) at 24oC and 67.2 kPa is completely burned in excess oxygen, how many moles of carbon dioxide will be produced? a. Write a balanced equation for the reaction. b. Use stoichiometry to find the volume of carbon dioxide. c. Use the ideal gas law to ...
Sunday, April 20, 2014 at 6:26pm

chemistry Equations
Write euations to show how a buffer made up of equimolar amounts of acetic acid, CH3COOH, and acetate, CH3COO-, would behave when (a) HCl was added and (b) NaOH was added. Is this right,If not what is the correct way? CH3COOH + HCl ----> CH3COOHCl + OH CH3COO + NaOH ---->...
Sunday, April 20, 2014 at 5:42pm

chemistry
HCL acid is available as a stock solution with a concentration of 10 mol/L. If you need (2.100*10^0) L of (2.3*10^0) mol/L hydrochloric acid, approximately how much distilled water will you need to make the dilution?
Sunday, April 20, 2014 at 4:29pm

Chemistry
Given the equilibrium reaction N2(g) + 3 H2(g) <---> 2NH3(g) + heat, an increase in temperature will: a) Increase the value of K b) Decrease the value of K c) Increase or decrease the value of K depending upon the concentration of reactants d) Will have no effect on the ...
Sunday, April 20, 2014 at 4:00pm

Chemistry
The equilibrium constant is 16 for the gas phase reaction SO2 + NO2 <--> SO3 + NO at a certain temperature. If 3.0 moles each of SO2 and NO2 are placed together in an empty 1.0 liter flask and the system is allowed to come to equilibrium at this temperature, what will be...
Sunday, April 20, 2014 at 2:33pm

Chemistry - check answer
A 20.0 L reaction vessel contains 0.016 moles CO2, 1.05 moles of CO, and 2.00 moles of C. The mixture is approaching the following equilibrium: CO2(g) + C(s) <--> 2CO(g) a) Calculate the reaction quotient Q. b) If value of K is 1.17, predict which direction the reaction ...
Sunday, April 20, 2014 at 2:14pm

Chemistry
22mL of hydrogen was collected over wter at 19C and 745mmHg. What mass of magnesium is reacted (1:1 mole ratio)
Sunday, April 20, 2014 at 1:08pm

Chemistry
A student intend to prepare 200ml of 0.3M NaCl solution . The mass in gram of NaCl needed to prepare solution is ?!
Sunday, April 20, 2014 at 11:36am

Chemistry
To remove temporary hardness we may use ?!!!
Sunday, April 20, 2014 at 11:34am

Chemistry
A water sample has TDS of 6000mg/l and the total hardness f 60mg/l , the water can be classified as ........
Sunday, April 20, 2014 at 11:34am

Chemistry
The mass of watch glass is 24.5 g , the mass of watch glass plus white crystals befor drying is 29.1g , and the mass of watch glass and white crystals after drying 27.9 , thus the mass of the white crystals is !????!
Sunday, April 20, 2014 at 11:28am

Chemistry
If we put a drop of acid in a cup of natural water , the PH will ?
Sunday, April 20, 2014 at 11:24am

Chemistry
1.2g of NaCl as used to prepare 200 ml solution , what is the molar concentration of NaCl in solution ?
Sunday, April 20, 2014 at 11:17am

Chemistry
A student mixed 40ml of 0.2m Na2co3 solution with 50 ml f 0.25M cacl2 solution , what is the except number of moles of naclkkw that I will be formed ?
Sunday, April 20, 2014 at 11:14am

Chemistry
The measured experimental volume of ascetic acid in a sample of vinegar was 7% and the manufacture claimed volume is 5.8% , what is the percentage error ?
Sunday, April 20, 2014 at 11:07am

Chemistry
What are the Salts are taken into consideration in the calculation of the total alkalinity ????
Sunday, April 20, 2014 at 11:04am

Chemistry
The separate suspended solid from a solution , we may use .......
Sunday, April 20, 2014 at 11:00am

Chemistry
In TDS experiment , the mass of the empty beaker was 25.683g , and the mass of the beaker after water evaporated 25.687 g , if the volume of the sample 50 ml , then the TDS of the water sample is ?
Sunday, April 20, 2014 at 10:57am

Chemistry
In an experiment we have 4 liters of AlAin water in contain or A , and 2 liters of dubai water in contain out B . The alkalinity of water in container A and the alkalinity of water in container B are 50 and 150mg/l as caco3 ,,respectively the alkalinity of water B is 7
Sunday, April 20, 2014 at 10:53am

Chemistry
In the. Reaction (Na2co3+CaCl2-->2NaCl+caco3) The precipitate is :
Sunday, April 20, 2014 at 10:47am

chemistry
Calculate the enthalpy change, ÄH DeltaH, for the process in which 12.7g g of water is converted from liquid at 7.3 ∘ C \, ^\circ C to vapor at 25.0 ∘ C \, ^\circ C . For water, ÄH vap \Delta H_{\rm vap} = 44.0kJ/mol kJ/mol at 25.0 ∘ C \, ^\circ C ...
Sunday, April 20, 2014 at 10:25am

Chemistry
If the equilibrium constant for a reaction A + B <----> C + D is K, which is true of the equilibrium constant K* for the reaction C + D <----> A + B under the same conditions? A) K* = K B) K* = 1/K C) K* = 1 - K D) K* = 1 - (1/K) E) K* = 1 + K
Sunday, April 20, 2014 at 8:16am

Chemistry
Predict how the entropy of the substance is affected in the following processes: a) O2 (g,200 kPa, 300k) --> O2 (g, 100, 300k) b)Br2 (l, 1 bar, 25 degree C) --> Br2 (g, 1 bar, 25 degree C) C)Fe (s, 1 bar, 250 degree C)--> Fe(s, 1 bar, 25 degree C) will entropy either ...
Sunday, April 20, 2014 at 12:47am

Chemistry need help
using standard potentials given in the appendices calculate the standard cell potentials and the equilibrium constants for the following reactions. Zn(s)+( Fe^2+(aq)) ---> (Zn^2+(aq))+ Fe(s) If anyone can show work, then I can do the rest of my homework by looking at this ...
Saturday, April 19, 2014 at 11:00pm

CHEMISTRY HELP !!!!
As a standard voltaic cell runs, it "discharges" and the cell potential decreases with time. Explain.
Saturday, April 19, 2014 at 10:24pm

chemistry
what is the concentration of phosphate in the original lake water sample if the unknown lake water sample
Saturday, April 19, 2014 at 9:44pm

Chemistry
a) 45.02% of the sample remains after 85 days. Consider how you can use the percent of Ir-192 remaining and the number of days to calculate the mass remaining after 85 days.
Saturday, April 19, 2014 at 9:39pm

Chemistry
What is the activity of a 18.9 μCi sample of carbon-14 in becquerels?
Saturday, April 19, 2014 at 7:53pm

CHEMISTRY HELP !!!!
a.) which of the following reactions should have the larger emf under standard conditions & why? CuSO4 (aq) + Pb (s) goes to PbSO4 (s) + Cu (s); Cu(NO3)2 (aq) + Pb(s) goes to Pb(NO3)2(aq) + Cu(s) b.) Calculate delta G for the reaction.
Saturday, April 19, 2014 at 5:52pm

chemistry first year
20L of N2 and 100 L of H2 are reacted to produce NH3 what is the decrease in the V of the mixture N2+3H2--> 2NH3 Ans me with reason
Saturday, April 19, 2014 at 6:14am

chemistry first yera
A 0.4 g sample of monobasic acid requires 16cm3 of 0.1 mol per dm3 of NaOH for complete neutralization . what is the relative mass of the acid?? Plz ans me urgent
Saturday, April 19, 2014 at 6:09am

Chemistry
A flask was immersed in 350 g of water at 25 degrees C. Steam at 100 degrees C was passed into this flask, and eventually condensed into water at 100 degrees C. If the temperature of the water surrounding the flask was raised to 70 degrees C, how many grams of steam must have ...
Friday, April 18, 2014 at 9:23pm

chemistry
what type of reaction occurs Fe3O4 + 4H2 → 3Fe + 4H2O
Friday, April 18, 2014 at 5:43pm

Chemistry
A 1.0 liter flask is filled with a mixture of two gases at 20. oC until a pressure of 14.43 atm is established. If 0.40 grams of the mixture is hydrogen, how many moles are there of the other gases?
Friday, April 18, 2014 at 5:20pm

Chemistry
A sample of a gas has a volume of 250. mL at 2.10 atm and 227 oC. What volume will it have at standard temperature and pressure (STP)?
Friday, April 18, 2014 at 5:19pm

chemistry
what is the pH of 0.80 M NaCN? what is the pH of 0.80 M NaCN? What is the concentration of HCN in the solution? I did this so far: I 0.8..... 0....0 C -x.......x....x E 0.8-x....x....x (x)(x)/0.8-x How do I solve for x?
Friday, April 18, 2014 at 2:33am

Chemistry
Help please: A 0.199-g sample of unknown metal (X) reacts with hydrochloric acid to produce 88.5 mL of "wet" gas at 20 °C and 754 mm Hg. What is the unknown metal (X)? (The vapor pressure of water at 20 °C is 18 mm Hg.) X(s) + 2 HCl(aq) → XCl2(aq) + H2(...
Thursday, April 17, 2014 at 10:05pm

chemistry
How many gramsof sodium carbonate are neededto make1.30l of0.890m
Thursday, April 17, 2014 at 9:26pm

chemistry
in the reaction Al2O3= Al+O2 if 742.5 grams of Al2O3 are used how many mols of Al will be produced?
Thursday, April 17, 2014 at 8:37pm

chemistry
Find the a)partial pressure of ethylene oxide and b)the total gas pressure, after 30 hours in a reaction vessel at 415C if the initial pressure of ethylene oxide is 782mmHg. k= 2.05x 10^-4 t(1/2)=56.3 Part A) I converted hours to seconds, and used the formula ln(Pa)t = 108000s...
Thursday, April 17, 2014 at 8:31pm

Chemistry
How many nonbonding electron pairs are in an oxygen molecule? I drew it but im unsure if Im correct in saying it has 2 nonbonding electron pairs.
Thursday, April 17, 2014 at 7:44pm

Chemistry
Which of the following statements is true regarding a covalent bond in CO? Valence electrons are transferred to the oxygen atom. The bond length is less than the sum of the two atomic radii. Bonding electrons are stationary in the CO molecule. all of the above none of the above
Thursday, April 17, 2014 at 6:48pm

Chemistry
If the solubility constant for Ag2CO3 is equal to 8.1x10^-12 how many grams of Ag2CO3 will dissolve in a .0001 M solution of Na2CO3?
Thursday, April 17, 2014 at 6:12pm

Chemistry
Ethanol will combust according to the following equation: C2H5OH(l)+3O2(g)->2CO2(g)+3H2O(l) How many liters of air are required to combust 120.1 g of ethanol at 26.4C and 789.5 mmHg. Assume air is 21% O2 by volume. I cannot find my error - professor states answer as 882.6...
Thursday, April 17, 2014 at 6:00pm

chemistry
How many calories will 45 grams of water release when it changes fom 85c to 30c?
Thursday, April 17, 2014 at 2:49pm

Chemistry
At 25 C, RT/F = (8.314 J/mol/K *298 K) /(96500 C/mol) =0.0257 volts. My textbook lists 0.0592. What am I doing wrong?
Thursday, April 17, 2014 at 2:48pm

Chemistry pH
A 0.60 M solution of a weak acid, HA, has a pH of 3.72. What is the percentage ionization of the acid? What is the value of Ka for the acid?
Thursday, April 17, 2014 at 2:17pm

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