Friday
July 29, 2016

Homework Help: Science: Chemistry

Recent Homework Questions About Chemistry

Chemistry
Given the balanced equation: H2 + Cl2 2 HCl , how many moles of HCl will be produced if 18.4 g H2 reacts with 127 g Cl2?
Friday, March 18, 2016 by Faith

Chemistry
The specific heat of aluminum is 0.900*j/g*C How much heat is required to raise the temperature of a 30.0 g block of aluminum from to 25.0 oC to 75 oC?
Friday, March 18, 2016 by Ashley

Chemistry
K2co3.xh2o weighted in 10,5 gramms reacted with chloride acid till there are no more k2co3.xh20 . Co2 was volumed 1.12 litres (0 celsius, 1 atmosphere). Determine how the number of x is!
Friday, March 18, 2016 by Axl

Chemistry
how much solid KNO3 will crystallize and a saturated solution of KNO3;if the solution is cooled from 65 degrees Celsius to 45 degrees Celsius.
Friday, March 18, 2016 by Rachel

chemistry
Which of the following is NOT true about a nuclear power plant? A. They can explode like a nuclear bomb. B. They produce radioactive waste that must be safely stored for many years. C. They produce fewer carbon emissions than a coal-fired power plant. D. They are a relatively ...
Friday, March 18, 2016 by louren

chemistry
What number is missing from this nuclear equation? ? 13Al + 1 0n --> 28 13Al A. 28 B. 41 C. 29 D. 27 would this be D? please explain, thank you!
Friday, March 18, 2016 by louren

chemistry
A radioactive isotope of radium (Ra-226) has a half-live of 1620 years. How much of this isotope remains after three (3) half-lives? A. 1/2 B. 1/4 C. 1/8 D. None would this be C? please explain, thank you!
Friday, March 18, 2016 by louren

chemistry
if we did this experiment in a refrigerator (4 C) would you expect that the volume of collected gas be greater than or less than the volume of gas you collected today at room temperature?
Friday, March 18, 2016 by Anonymous

Chemistry
What is the mass of all atoms in 2Fe+3O2=2Fe2O3
Thursday, March 17, 2016 by Devon

Chemistry
what is the maximum amount of NO2 which could be formed from 14.75 g of NO and 1.28 g of O2? Answer in units of mol. i believe its 2 NO + O2 -> 2 NO2 but I'm not sure and i don't know what to do when i tried with stoichiometry i got .4916 but when i got told its the...
Thursday, March 17, 2016 by Matt

Chemistry
How many ions does 3 moles of zinc hydroxide have? I believe 1 mole of zinc hydroxide contains 3 ions so do I just multiply it by 3?
Thursday, March 17, 2016 by Anthony

Chemistry
Convert 33°c and 43°c to Kelvin scale
Thursday, March 17, 2016 by Seyi

Chemistry
Calculate molarity of KNO3 solution if 69 g of salt are dissolved into 250 mL of solution
Thursday, March 17, 2016 by Marissa

chemistry
Hi, Can anyone suggest a protocol for preparing 1 Litre ammonical solution (pH 7.8, NH4-N, 3000 mg/L) from NH4Cl and NaOH? I have worked out that I need 10.7g NH4CL and 0.45 g NaOH -is this correct? I am assuming that 1st step is to prepare 0.45 g NaoH in 0.5 L distilled water...
Thursday, March 17, 2016 by niko

Chemistry
The equlibrium contstant for equation HNO2(aq) + H2O(l) <--> H3O+ (aq) + NO2-(aq) is Ka = 5.6 E-4 M at 25.0 C. What is the value of Delta G rxn at 25.0 C when [H3O+] = [NO2-] = 1.5E-3 M and [HNO2] = 0.75 M? a) -13.0 kJ*mol-1 b) -16. 9 kJ*mol-1 c) -18.9 kJ*mol-1 d) -31.5 ...
Thursday, March 17, 2016 by College Student

Chemistry
Under standard conditions, the Gibbs free energy of the reactants G,std(reactants) in a redox reaction in aqueous solution is 360.65 kJ and the Gibbs free energy of the products G,std(products) is 158.14 kJ. The number of moles, n, of electrons transferred in the redox ...
Wednesday, March 16, 2016 by Daphne

chemistry
Calculate the Molarity of the unknown acid if 25.0 mL of the acid reacts with 17.50 mL of 0.14 M NaOH solution. Assume that NaOH and acid react in 1:! ratio. Show your work. (Hint: Find the moles of NaOH from the given molarity and volume. mols of NaOH = mols of acid. Knowing ...
Wednesday, March 16, 2016 by shosho

Chemistry
Calculate the mass of KHP (molar mass 204.44 g/mol) that reacts with 15.0 mL of the 0.15 M NaOH solution (molar mass 40.00 g/mol) required for standardization of the NaOH solution. Show your work.
Wednesday, March 16, 2016 by shosho

Chemistry
If I am doing a fractional distillation, is the temperature of the first few drops of the distillation considered part of the boiling range? Or do you wait until later in the distillation?
Wednesday, March 16, 2016 by Danny

chemistry
Calculate the mass of copper (ii) sulphate which needs to be used to prepare 500cm³ of a 0.1M solution.
Wednesday, March 16, 2016 by Livingstone

Chemistry DR BOB
Under standard conditions of 1 atm and 298.15K, the half-cell reduction potential E,zero for the anode in a voltaic cell is 0.37V. The half-cell reduction potential E,zero for the cathode of the cell is 0.67V. The number of moles, n, of electrons transferred in the redox ...
Wednesday, March 16, 2016 by Brooke

Chemistry
Use the method of half reactions to balance the oxidation half reaction in acid solution as well as provide the oxidized and reduced reactants. Cr2O7 {2-} (aq) + F{-} (aq) = Cr {3+} (aq) + F2(aq) Charges are in { }
Tuesday, March 15, 2016 by Kevin

Chemistry
If it requires 23.4 milliliters of 0.65 molar barium hydroxide to neutralize 42.5 milliliters of nitric acid, solve for the molarity of the nitric acid solution. Show all of the work used to solve this problem. Unbalanced equation: Ba(OH)2 + HNO3 -> Ba(NO3)2 + H2O
Tuesday, March 15, 2016 by Lilly

Chemistry
Will cadmium hydroxide precipitate from 0.01M solution of cadmium chloride at pH 9. Ksp of cadmium hydroxide =2. 5×10-14 mole2/dm6
Tuesday, March 15, 2016 by Aqsa

Chemistry
What mass of naoh is neutralized by 43.55ml of 0.145m H2SO4?
Tuesday, March 15, 2016 by Maxx

Chemistry
Hi! My name's Isabow! can someone please help with this question? Thanks in advance :3 <3 <3 <3 If it requires 23.4 milliliters of 0.65 molar barium hydroxide to neutralize 42.5 milliliters of nitric acid, solve for the molarity of the nitric acid solution. Show ...
Monday, March 14, 2016 by Isabow

Chemistry
If the percent (mass/mass) for a solute is 6% and the mass of the solution is 300 g., what is the mass of solute in solution?
Monday, March 14, 2016 by Lori

Chemistry
What is the mass of Na2SO4 is needed to make 1.5 L of 3.0 M solution? Na=23 g.: s = 32 g: O=16g.)
Monday, March 14, 2016 by Lori

Chemistry
Why does a compound with a high vapor pressure boil at a lower temperature than a compound with a lower vapor pressure?
Monday, March 14, 2016 by Anonymous

chemistry
If the solubility of gas in water is 5.0g/L when the pressure of the gas about the water is 2.0 atm, what is the pressure of the gas above the water when the solubility of the gas is 1.0 g/L?
Monday, March 14, 2016 by Lori

physical chemistry
the rate constant for a reaction at 30 degrees is found to be exactly twice the value at 20 degrees. calculate the activation energy
Monday, March 14, 2016 by ntsika

Chemistry
You start with a 20ml mixture of two compounds. After distillation you end up with 10ml of distillate 1 and 8.4ml of distillate 2. What is the relative volume percent of each compound in the pre-distilled mixture? (Do I just do: volume percent of mixture1=10/20 and volume ...
Monday, March 14, 2016 by Danny

Chemistry
How do I prepare 1liter of a 93.1% w/w solution of sulfuric acid using 98% sulfuric acid and water?
Monday, March 14, 2016 by Pam

Chemistry
3. The Haber¡VBosch process for fixation of nitrogen is one of the more important chemical reactions ever invented. Without the invention of this process, which is used to make ammonia for fertilizer, the world¡¦s population would not be as large as it is ...
Monday, March 14, 2016 by Chastity

Chemistry
List three ways in which the yield of ammonia in the reaction above can be improved for a given amount of H2.
Monday, March 14, 2016 by Chastity

Chemistry
at 500K, Kc for the reaction:H2 +D2 gives 2HD is 3.6 what is the value of Kc for 2HD gives H2 +D2
Monday, March 14, 2016 by Yashika

chemistry
at certain altitude in the upper atmosphere, the temperature is estimated to be -100 degree celsius and the density just 10^-9 that of the earth's atmosphere at STP. Assuming a uniform atmosphere at STP. Assuming a uniform atmospheric composition, what is the pressure, in ...
Monday, March 14, 2016 by taylor

chemistry
Suppose that the microwave radiation has a wavelength of 12 cm . How many photons are required to heat 255 mL of coffee from 25.0 ∘C to 62.0 ∘C? Assume that the coffee has the same density, 0.997 g/mL , and specific heat capacity, 4.184 J/(g⋅K) , as water ...
Monday, March 14, 2016 by christina

Chemistry
We did a titration of calcium hydroxide lab in chemistry, once with and once with edta, we have to calculate the solubility for both, and the ksp, for the hcl I did (concentration)*(Volume of hcl used) then that answer divided by two divided by the amount of divided by the ...
Monday, March 14, 2016 by Dan

Chemistry-DrBob222
I got an answer of -1.34 x 10^3 KJ/mol. A 10.00 mL aliquot of 0.100 M NaOH is added to 15.00 mL of 0.100M HCl in a coffee cup calorimeter. The initial temperature of the two dilute liquids were both 25.0 degrees C and the final temperature of the mixture was found to be 37.8 ...
Monday, March 14, 2016 by Nevaeh

Chemistry-DrBob222
Is the answer for part c 0.91? A 1.0 L ball containing Ar at 5 atm is connected to a 10.0 L ball containing N2 at 2atm. A)Calculate the partial pressures and mole fractions of Ar and N2 after the valve is opened and the gases are allowed to mix (they fill the balls on both ...
Monday, March 14, 2016 by Nevaeh

Chemistry-DrBob222
Where did you get 5E-5. Is this how you set it up? 0.01 x 0.05 = 5E-4 If so, is it supposed to be 5E-4 instead of 5E-5? What is the equilibrium constant for a weak acid HA that dissociates 1% at an initial concentration of 0.05 M according to the following balanced chemical ...
Monday, March 14, 2016 by Nevaeh

ANALYTICAL CHEMISTRY
Explain the following statement: "The validity of a chemical analysis ultimately depends on measuring the response of the analytical procedure to known standards." (b) Calibration curves are necessary in many chemical measurements involving electrochemistry, ...
Sunday, March 13, 2016 by KAMBOYI KAMBOYI

Chemistry
In a crazy scenario, the Oylan Vinegar Company has 10,000 gallons of vinegar with 0.622% concentration. This vinegar solution cannot be sold because it's too weak, but the plant manager can't bear to discard it. OVC also has a large batch of vinegar that is 9.50% ...
Sunday, March 13, 2016 by Mads

chemistry
A 1L flask contains 0.2moles of air open to atmosphere at 0degree celcius. Upon heating some of the air is lost. What is the percentage of air remaining in the flask?
Sunday, March 13, 2016 by william

Chemistry
I need help on this question. Identify the mistakes in the following balanced equations. Rewrite the equation to make it correct. Each question has one mistake to correct. a) C9H20+12O2 -> 9CO2 + 10H2O b) H2+Cl -> 2HCl
Sunday, March 13, 2016 by Josh

Chemistry
What is the mass of MgCl2 required to make 500mL if 1.200 M of MgCl2 Solution? I'm having trouble figuring out what the equation looks like. I believe the answer is 57.127g but if so i would like to know why. I did (1.200M*.500mL)/1000* mass of MgCl2. How do i find how ...
Sunday, March 13, 2016 by Lemi

chemistry
When aqueous solutions of chromium(III) bromide and potassium phosphate are combined, solid chromium(III) phosphate and a solution of potassium bromide are formed. The net ionic equation for this reaction is:
Sunday, March 13, 2016 by Anonymous

Chemistry
What is the mass needed to make 8.5L of a 4.0 M solutution of Na2SO4? (Na=23, s=32, O=16)
Sunday, March 13, 2016 by jason

chemistry inorganic
Potassium tetraoxalate has the formula H2C2O4.KHC2O4.xH2O. 1.923 g of the above compound was neutralized by 22.7 mL of 1.000 M NaOH using phenolphthalein as the indicator. Calculate the value of x in the formula.
Sunday, March 13, 2016 by Anonymous

Chemistry
Write the balanced reaction for the incomplete combustion of pentane, assuming the formation of carbon monoxide and water as the products. Enter the coefficient for each compound. (Use the lowest possible coefficients. Use the pull-down boxes to specify states such as (aq) or...
Sunday, March 13, 2016 by Carmen

Chemistry
This is for grade 11 chemistry, balancing equations. Help asap? I'd like to get it done by tonight, if possible. Type of reaction: Predict product in words: Write Balance equation: Heres the question. Aluminum+ Zinc Sulfide =
Sunday, March 13, 2016 by Colton

Chemistry
How many grams of water will be produced by the complete combustion of 10.00 g of octane (C8H18)? Mass of water = g H2O
Saturday, March 12, 2016 by Carmen

chemistry
how many grams of silver carbonate will precipitate when excess ammonium carbonate soln is added to 41.0 mL of a .518 M silver nitrate solution?
Saturday, March 12, 2016 by JJ

chemistry
what volume of .1 M solution of NaOH is required to precipitate all of the nickel 2+ ions from 250 mL of a .273 M solution of nickel (II) nitrate?
Saturday, March 12, 2016 by Anonymous

chemistry
a 500ml stock solution of NAOH has a purity of 70% and a density of 1.9g/ml. calculate the concentration that would be in a 1L solution. calculate the molarity. What volume would we have to take to prepare 250ml of a solution of 0.1 mol/l
Saturday, March 12, 2016 by helen

a level chemistry
variation of the rate constant with temperature for the first order reaction 2N2O(g) = 2N2O4(g) + O2(g) is given in the following table. determine graphically the activation energy for the reaction. |t(k)|273 298 318 338 |k(second)| 7.87 x 10^3. 3.46 x 10^5. 4.98 x 10^6. 4.87 ...
Saturday, March 12, 2016 by chancy

Chemistry- DrBob222
What is the equilibrium constant for a weak acid HA that dissociates 1% at an initial concentration of 0.05 M according to the following balanced chemical equation? HA <----> H+ + A-
Saturday, March 12, 2016 by Nevaeh

Chemistry
A 10.00 mL aliquot of 0.100 M NaOH is added to 15.00 mL of 0.100M HCl in a coffee cup calorimeter. The initial temperature of the two dilute liquids were both 25.0 degrees C and the final temperature of the mixture was found to be 37.8 degrees C. What is the (molar) heat of ...
Saturday, March 12, 2016 by Nevaeh

Chemistry-DrBob222
I got 62.9 mL. Is this correct? I think HCl is the LR. A piece of solid magnesium is reacted with hydrochloric acid to form hydrogen gas: Mg (s) + 2HCl (aq) ---> MgCl2 (aq) + H2 (g) What volume of hydrogen gas (in mL) is collected over water at 25 degrees Celsius by ...
Saturday, March 12, 2016 by Nevaeh

Chemistry -DrBob222
How many gallons of ethylene glycol, molar mass 62.07 g/mol, density = 1.1 g/mol do you need to add to each gallon of water ( 1 gallon = 4 liters and kf = 1.85 C/m) in your radiator to get the water to freeze at -15 C? Is it 0.458 gallon?
Saturday, March 12, 2016 by Nevaeh

Chemistry-DrBob222
What is the final temperature and physical state if water when 47.50 kJ of energy is added to 15.0 g of ice at -10.0 C? Helpful information: Cs (ice) = 2.1 J/g C Heat of fusion (water) = 6.02 kJ/mol Cs (water) = 4.184 J/g C Heat of vaporization (water) = 40.7 kJ/mol Cs (steam...
Saturday, March 12, 2016 by Nevaeh

Chemistry
A 1.0 L ball containing Ar at 5 atm is connected to a 10.0 L ball containing N2 at 2atm. A)Calculate the partial pressures and mole fractions of Ar and N2 after the valve is opened and the gases are allowed to mix (they fill the balls on both sides). My answers: P argon = 0....
Saturday, March 12, 2016 by Nevaeh

Chemistry
At 700 k the equilibrium constant Kc for the reaction between NO(g) and O2(g) forming NO2(g) is 8.7*10^6. The rate constant for the reverse reaction at this temperature is 0.54 M^(-1)s^(-1). What is the value of the rate constant for the forward reaction at 700 K?
Saturday, March 12, 2016 by Shay

university chemistry
the oxygen produce was colleced by displement method at (22c)at a total pressure of (754torr)the vapor pressure of water at (22c) in (21torr) calculate the pershel pressure of oxygen in the collected
Saturday, March 12, 2016 by Muhammad

Chemistry-DrBob222
A 1.0 L ball containing Ar at 5 atm is connected to a 10.0 L ball containing N2 at 2atm. A)Calculate the partial pressures and mole fractions of Ar and N2 after the valve is opened and the gases are allowed to mix (they fill the balls on both sides). My answers: P argon = 0....
Friday, March 11, 2016 by Nevaeh

Chemistry-DrBob222
A 1.0 L ball containing Ar at 5 atm is connected to a 10.0 L ball containing N2 at 2atm. A)Calculate the partial pressures and mole fractions of Ar and N2 after the valve is opened and the gases are allowed to mix (they fill the balls on both sides). My answers: P argon = 0....
Friday, March 11, 2016 by Student

Chemistry
Can you determine the limiting reactant just by comparing the masses of the reactants?
Friday, March 11, 2016 by Anonymous

General Chemistry
Carbonic acid forms when carbon dioxide dissolves in water. A typical can of soda contains a 0.120 M solution of CO2. Assuming that all dissolved CO2 is present as carbonic acid, and that no other substances dissolved in solution affect the pH, what is the pH of this solution...
Friday, March 11, 2016 by Erik

Chemistry
Is the same reactant always the limiting reactant?
Friday, March 11, 2016 by Anonymous

Chemistry-DrBob222
I know I pored this already, but I for it to mention the assumption. See below. A calorimeter contains 30.0 mL of water at 15.0 C. When 1.50 g of X (a substance with a molar mas of 46.0g/ mol is added, it dissolves via the reaction X (s) + H2O (l) ----> X (aq) and the ...
Friday, March 11, 2016 by Student

Chemistry
Oxygen (O2) is about 20% of our air, with about 80% nitrogen and a bunch of minor components. In Colorado Springs, where I grew up, the elevation is ~ 6500 feet and atmospheric pressure is only around 9 psi (vs. 14.7 psi at sea level). Under those conditions and assuming T = ...
Friday, March 11, 2016 by Student

Chemistry
A calorimeter contains 30.0 mL of water at 15.0 C. When 1.50 g of X (a substance with a molar mas of 46.0g/ mol is added, it dissolves via the reaction X (s) + H2O (l) ----> X (aq) and the temperature of the solution increases to 26.5 C. Calculate the enthalpy change for ...
Friday, March 11, 2016 by Student

Chemistry- DrBob222
Please check. Oxygen (O2) is about 20% of our air, with about 80% nitrogen and a bunch of minor components. In Colorado Springs, where I grew up, the elevation is ~ 6500 feet and atmospheric pressure is only around 9 psi (vs. 14.7 psi at sea level). Under those conditions and ...
Friday, March 11, 2016 by Student

chemistry
At 25 °C, the density of a 60.0% (m/m) solution of sucrose, C12H22O11, in water is 1.29 g/mL. What is the molarity of this solution?
Friday, March 11, 2016 by Anonymous

Inorganic Chemistry
In a constant-pressure calorimeter, 70.0 mL of 0.340 M Ba(OH)2 was added to 70.0 mL of 0.680 M HCl. The reaction caused the temperature of the solution to rise from 22.00 °C to 26.63 °C. If the solution has the same density and specific heat as water (1.00 g/mL and 4....
Friday, March 11, 2016 by Michael

chemistry
calculate the mass of chlorine gas contained in a 5dm3 flask at 25degrees celsuis and 98kpa pressure.
Friday, March 11, 2016 by sopuruchi

Inorganic Chemistry
In a constant-pressure calorimeter, 70.0 mL of 0.340 M Ba(OH)2 was added to 70.0 mL of 0.680 M HCl. The reaction caused the temperature of the solution to rise from 22.00 °C to 26.63 °C. If the solution has the same density and specific heat as water (1.00 g/mL and 4....
Friday, March 11, 2016 by Michael

Inorganic Chemistry
A researcher studying the nutritional value of a new candy places a 4.70-gram sample of the candy inside a bomb calorimeter and combusts it in excess oxygen. The observed temperature increase is 2.98 °C. If the heat capacity of the calorimeter is 39.80 kJ·K–1, ...
Friday, March 11, 2016 by Michael

Chemistry
1. Oxygen (O2) is about 20% of our air, with about 80% nitrogen and a bunch of minor components. In Colorado Springs, where I grew up, the elevation is ~ 6500 feet and atmospheric pressure is only around 9 psi (vs. 14.7 psi at sea level). Under those conditions and assuming T...
Thursday, March 10, 2016 by Student

chemistry
Mg+2Hcl---mgcl2+h2 volume of h2=40ml Hcl is 6M what mass os h is obtained by addin excess hcl to 6m of magnesium
Thursday, March 10, 2016 by suni bohr

Chemistry- Dr.Bob222
Predict the effect of decreasing the temperature on the position of the following equilibria. (a) H2(g) + Cl2(g) ↔ 2HCl(g) + 49.7 kJ My answer: shifts to the right (b) 2NH3(g) ↔ N2(g) + 3H2(g) ∆ H = 37.2 kJ My answer: shifts to the left (c) CO(g) + H2O(g) &#...
Thursday, March 10, 2016 by Nevaeh

Chemistry
Diethyl ether (also known as “ether”), C4H10O (l), is an organic compound that has long been used as a surgical anesthetic. The complete combustion of 1 mol of C4H10O (l) to CO2 (g) and H2O (l) yields ΔH °=-2723.7 kJ. a) Write a balanced equation for the ...
Thursday, March 10, 2016 by Feufolia

Chemistry
A student collected concentration data to determine the rate of the decomposition of N2O5 to NO2 and O2. The data were recorded in the table below. What is the rate law of this reaction? k[N2O5] k[N2O5]2 k k[NO2]
Thursday, March 10, 2016 by Steph

chemistry
my developing solvent is hexane toluene acetic acid(5:5:1)nd my samples rf nd impurity rf is very close,my spots r not separating properly,so which hexane should hav to be used?n hexane or hexane fraction?is only hexane affect or other factor is there?
Thursday, March 10, 2016 by aparna

math111
in a science class,65 student study physics while 40 study chemistry.if there are 93 student in the class,how many student study both physics and chemistry?
Thursday, March 10, 2016 by james

chemistry
calculate the pH of a 0.100M NH4Cl solution.
Thursday, March 10, 2016 by amy

Chemistry
If I was designing an experiment where hydrogen gas was collected over a 0.1 M aqueous HCl solution from the reaction with zinc metal and I assume complete, rapid reaction, what mass of zinc would be used to collect between 50 and 100 mL of the gas? Note: I calculated using ...
Wednesday, March 9, 2016 by Student

chemistry
how many grams of Zn metal would you use to prepare 6.8g of zinc chloride according the reaction: Zn(s)+2HCl(aq)-> ZnCl2(aq)+H2(g)
Wednesday, March 9, 2016 by jane

chemistry
how many grams of Zn metal would you use to prepare 6.8g of zinc chloride according the reaction: Zn(s)+2HCl(aq)-> ZnCl2(aq)+H2(g)
Wednesday, March 9, 2016 by jane

Intro to Chemistry
A 9.40-L container holds a mixture of two gases at 47 °C. The partial pressures of gas A and gas B, respectively, are 0.344 atm and 0.520 atm. If 0.160 mol of a third gas is added with no change in volume or temperature, what will the total pressure become?
Wednesday, March 9, 2016 by Richard

Science chemistry
An excces of sulfur dioxide was reacted with 0.150 g of oxigen gas. A mass of 0.725 g of sulfur trioxide was recovered
Wednesday, March 9, 2016 by Mss.unknown

chemistry
The voltage of an electrochemical cell depends on the redox reaction occurring in the cell. Given a redox reaction below: Zn(s) + Pb2+(aq) --> Zn2+(aq) + Pb(s) Pb2+(aq) + 2 e--->Pb(s)Eº = -0.13V Zn2+(aq) + 2 e--->Zn(s)Eº = -0.76V Calculate the E.M.F (Voltage...
Wednesday, March 9, 2016 by bliss

chemistry
Given the equation below, if 3.87×1023 particles of Sb2S3(s) are reacted with excess Fe(s), what mass of FeS(s) is produced? Sb2S3(s) + 3Fe(s)→2Sb(s) +3FeS(s)
Wednesday, March 9, 2016 by bliss

chemistry
What is the concentration oh hydrogen ions in a solution containing .676 M HOCN and .413 M NaOCN? The ionization constant of cyanic acid is 3.5 x 10^-4. Answer in units of M.
Wednesday, March 9, 2016 by Juicy

Chemistry
Calculate the weight % of HOAc in pure Vinegar?
Wednesday, March 9, 2016 by Rich

Chemistry
The Li2+ ion is hydrogenic and has a Lyman series at 740747 cm-1, 877924 cm-1, 925933 cm-1,and beyond. Show that the energy levels are of the form –hcR/n^2 and find the value of R for this ion. Go on and predict the wavenumbers of the two longest wavelength transitions of...
Wednesday, March 9, 2016 by Joesph

Chemistry
Calculate the mass of the deuteron given that the first line in the Lyman series of H lies at 82259.08 cm-1 whereas that of D lies at 82281.476 cm-1. Calculate the ratio of ionization energies of H and D.
Wednesday, March 9, 2016 by Joesph

chemistry
What mass of K2HPO4 must be added to 1 L of .1 M K3PO4 to prepare a buffer solution with a pH of 10.8? Answer in units of grams.
Wednesday, March 9, 2016 by Avery

Chemistry
What chemical occurs to the red cabbage red for acids and blue for bases.
Wednesday, March 9, 2016 by jason

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