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May 25, 2015

Homework Help: Science: Chemistry

Recent Homework Questions About Chemistry

Chemistry
for the titration of n.89g of an uk diaprotic acid with .2500 N sodium hydroxide, it took 35.5 mL to reach the phenolphthalein endpoint, calculate the molar mass.
Monday, February 2, 2015 at 6:39pm

chemistry
Why would a unknown solid cube sink in cholorform that has a density of 1.489
Monday, February 2, 2015 at 6:22pm

chemistry
In 100 mL of distilled water,1.0g of thallium cholirde is added. How much of the 1.0g of TlCl doen't dissolve? The Ksp of TlCl is 3.6 x 10-6
Monday, February 2, 2015 at 5:27pm

chemistry
Please help !? Knowing that the concentration of Ag+ in a silver chromate solution is 1.5 x 10-3 M, calculate its solubility product at 25°C.
Monday, February 2, 2015 at 5:23pm

chemistry
Stuck on this one please help ! The solubility of barium sulphate, BaSO4, is 2.4 x 10-4 g/100 mL of solution. Calculate the Ksp of this solution.
Monday, February 2, 2015 at 5:21pm

Integrated Physics and Chemistry
What are a few of the positive things the Equal Rights Amendment would have done for women in America?
Monday, February 2, 2015 at 4:26pm

Chemistry- sig figs
0.2748 Is my answer and the problem is sig figs... The question have two sig figs so would it be .27 or .28?
Monday, February 2, 2015 at 3:52pm

chemistry
what does copper look like under normal condition(solid,liquid,gas,color,etc)
Monday, February 2, 2015 at 3:00pm

Chemistry
Calculate the ΔHrxn for the following reactions using the heats of formation given in the table at the end of this assignment: a)The complete combustion of methane, CH4, producing water as a liquid. b)The complete combustion of glucose, C6H12O6, producing water as a ...
Monday, February 2, 2015 at 12:01pm

oragnic chemistry
convert the measurement 92.0g into pounds (1lb=453.6g)
Monday, February 2, 2015 at 10:59am

chemistry
A chemist used 500g of glucose(c6H12o6)in a preparation of a drug in the laboratory how many moles was used?
Monday, February 2, 2015 at 10:34am

Chemistry
Which of the following general equations describes all decomposition reactions? decompo single double A 2N2O5 → O2 + 4NO2 Is what type of chemical reaction? Combustion Synthesis Decomposition None of the above. not sure Which of the following is a decomposition reaction...
Monday, February 2, 2015 at 10:04am

Chemistry
Decomposition reactions result in __________ compounds. bigger smaller not sure
Monday, February 2, 2015 at 9:49am

Chemistry
(a) What type of ion chromatography (cation or anion) will you use to separate the following ions: Cu2+, Fe3+, Ag+ and Na+ . I'm having trouble here as I know that in elution chromatography they use like charges to separate ions, but is that the same case in ion-exchange...
Monday, February 2, 2015 at 4:15am

Chemistry
How do you change 15% to moles
Sunday, February 1, 2015 at 11:33pm

chemistry
In 100 mL of distilled water,1.0g of thallium cholirde is added. How much of the 1.0g of TlCl doen't dissolve. The Ksp of TlCl is 3.6 x 10-6.
Sunday, February 1, 2015 at 11:32pm

chemistry
Please help?! if 600 mL of a 0.04M KCl solution is mixed with 50mL of a 0.03M Na2SO4 solution, will a precipitate be formed? Explain your reasoning and/or show all calculations?
Sunday, February 1, 2015 at 11:31pm

chemistry
I have no idea how to go about this question, please help! A clumsy chemist accidentally pours 100 mL of a 0.004 M Na2SO4 solution into a beaker containing 500 mL of 0.050 M CaCl2. Will a precipitate be formed? Explain your reasoning and/or show all calculations?
Sunday, February 1, 2015 at 11:29pm

chemistry
Stuck on this questions ?! please help The solubility of barium sulphate, BaSO4, is 2.4 x 10-4 g/100 mL of solution. Calculate the Ksp of this solution.
Sunday, February 1, 2015 at 11:28pm

Chemistry
Determine the molarity of a 15.0 % by mass Hydrogen Peroxide solution. The density of Hydrogen Peroxide is 1.054 g/mL. The 15.0% by mass can be broken apart into 15.0 g Hydrogen Peroxide and 100.0 g solution. Use the density of Hydrogen Peroxide solution (1.054 g/mL) to ...
Sunday, February 1, 2015 at 11:01pm

Chemistry
Determine the number of grams of Potassium Iodate present in 10.0 g of a 0.267 m Potassium Iodate solution.
Sunday, February 1, 2015 at 10:25pm

Chemistry
The age of wine can be determined by measuring the trace amount of radioactive tritium, 3H, present in a sample. Tritium is formed from hydrogen in water vapor in the upper atmosphere by cosmic bombardment, so all naturally ocurring water contains a small amount of this ...
Sunday, February 1, 2015 at 10:20pm

Chemistry Rate Reaction
What is the rate of the reaction: H2SeO3 + 6I- + 4H+ Se + 2I3- + 3H2O given that the rate law for the reaction at 0°C is rate = (5.0 × 10^5 L5mol-5s-1)[H2SeO3][I-]^3[H+]^2 The reactant concentrations are [H2SeO3] = 1.5 × 10^-2 M, [I-] = 2.4 × 10^-3 M, [H...
Sunday, February 1, 2015 at 7:06pm

Chemistry
If you had a mixture of sodium chloride and sodium bromide, could you use its conductance to determine the concentration of each solute? Explain.
Sunday, February 1, 2015 at 6:41pm

Chemistry
Determine the moles of Potassium Iodate present in a 0.267 m Potassium Iodate solution assuming you have 1 kg of solvent (H2O) present.
Sunday, February 1, 2015 at 6:28pm

Chemistry
Determine the mass (in grams) of a 1% solution of Manganese(II) Sulfate that will contain 0.0403 grams.
Sunday, February 1, 2015 at 6:19pm

chemistry II
What is the molarity of a solution of acetic acid if 35.00mL is titrated to the end point with 68.20ml of 0.750M KOH? What is the percentage by mass of acetic acid solution? The density of acetic acid is 1.06 g/ml
Sunday, February 1, 2015 at 6:11pm

chemistry
In an acid-base titration, 33.12ml of 0.1177 M H2C2O4 was titrated with 0.2146 M NaOH to the end point. What volume of the NaOH solution was used?
Sunday, February 1, 2015 at 6:10pm

Chemistry
Determine the mass (in grams) of Malonic Acid (C3H4O4) present in 10.0 mL of a 0.200 M solution.
Sunday, February 1, 2015 at 6:04pm

chemistry
how many moles are present in 2.45 x 10²³ molecules CH₄?
Sunday, February 1, 2015 at 5:09pm

Chemistry
The formation constant of [M(CN)4]^-2 is 7.70 × 10^16, where M is a generic metal. A 0.150-mole quantity of M(NO3)2 is added to a liter of 0.840 M NaCN solution. What is the concentration of M2 ions at equilibrium?
Sunday, February 1, 2015 at 4:07pm

Chemistry
Can someone please help me solve this problem? Calculate the solubility of Ba3(PO4)2 in water. For Ba3(PO4)2, Ksp = 1.3 x 10- 29 Thank you!
Sunday, February 1, 2015 at 4:03pm

chemistry
sucrose change of H is -2226.1kj/mol fructose change of H is -1265.6KJ/mol calculate the enthalpy change for the hydrolysis reaction of sucrose. sucrose + H2O(l)-> C6H12O6(s)+Fructose Is it just the products-reactants?? I'm confused.
Sunday, February 1, 2015 at 3:34pm

chemistry
Co2(aq)->Co2(g) calculate the free-energy change for this reaction at 25 degrees Celsius.
Sunday, February 1, 2015 at 3:09pm

chemistry
what statements are true for the standard entropy change for the conversion of ozone to oxygen? Select all the apply? 2 O_3 (g) > 3 O_2 (g) Molecular factors predict an increase in entropy Stoichiometric factors predict a decrease in entropy. Molecular factors predict a ...
Sunday, February 1, 2015 at 3:07pm

Chemistry
Estimate the rate of the reaction, H2SeO3 + 6I- + 4H+ Se + 2I3- + 3H2O given that the rate law for the reaction at 0°C is rate = (5.0 × 10^5 L5mol-5s-1)[H2SeO3][I-]^3[H+]^2 The reactant concentrations are [H2SeO3] = 1.5 × 10^-2 M, [I-] = 2.4 × 10^-3 M, [H...
Sunday, February 1, 2015 at 1:24pm

chemistry
5.6g of organic compound on burning with exess oxygen gave 17.6g of CO2 and 7.2g of H2O .the organic compound
Sunday, February 1, 2015 at 11:34am

chemistry
The following experimental data were obtained for the reaction; 2 NO + 2 H2 ¡æ N2+ 2 H2O Rate/10-5M/s [NO]/10-2M [H2]/10-2M 0.50 0.50 0.20 2.00 1.00 0.20 0.25 0.25 0.40 Write a rate law in agreement with the data. Rate = What is the value and units of the rate ...
Sunday, February 1, 2015 at 5:06am

Chemistry
The primary route for making copper iodide is by reacting potassium iodide with copper sulfate: 2CuSO4 + 4KI + 2Na2S2O3 ==> 2CuI + 2K2SO4 + 2NaI + Na2S4O6 Identify potential green chemistry and green engineering challenges of the reaction.
Sunday, February 1, 2015 at 4:21am

chemistry
A sample of 131 I was purified and then analyzed for iodine content. It was found that the sample was 99.8% pure. 25 hours later the sample was tested again and it was found that the sample was now just 78.2% pure. What is the half - life of 131 I?
Sunday, February 1, 2015 at 4:03am

Chemistry
Estimate the rate of the reaction, H2SeO3 + 6I^- + 4H^+ --> Se + 2I3^- + 3H2O given that the rate law for the reaction at 0°C is rate = (5.0 × 105 L5mol-5s-1)[H2SeO3][I-]^3[H+]^2 The reactant concentrations are: [H2SeO3] = 1.5 × 10-2 M [I-] = 2.4 × 10-...
Sunday, February 1, 2015 at 1:18am

chemistry
Calculate the ΔH of reaction for: C2H4(g) + H2O(l) = C2H5OH(l) if the ΔH of formation for C2H4(g), H2O(l) and C2H5OH are +52, -286 and -278 kJ/mol, respectively? Enter a numerical value below and be sure to include a minus sign if needed. The error interval is +/- 5 ...
Saturday, January 31, 2015 at 11:50pm

chemistry
Welders often use acetylene torches heat up the metal. The reaction is: C2H2(g) + 2.5O2(g) = 2CO2(g) + H2O(g) Calculate the ΔH of reaction for this reaction.
Saturday, January 31, 2015 at 9:41pm

chemistry
Given: Equation #1: 4NH3(g) + 5O2(g) = 4NO(g) + 6H2O; ΔH of reaction = -1170 kJ Equation #2: 4NH3(g) + 3O2(g) = 2N2(g) + 6H2O; ΔH of reaction = -1530 kJ Then what is the ΔH of reaction for: N2(g) + O2(g) = 2NO(g)? Enter a numerical value below and be sure to ...
Saturday, January 31, 2015 at 8:57pm

chemistry
Calcium carbide (CaC2) reacts with water to form acetylene (C2H2) gas and calcium hydroxide (Ca(OH)2). If the ΔH for: CaC2(s) + 2H2O(l) = Ca(OH)2(s) + C2H2(g) is -127 kJ, then what is the enthalpy of formation for calcium carbide? The ΔH of formation for H2O(l), Ca(...
Saturday, January 31, 2015 at 8:56pm

chemistry
Suppose that your morning shower is 7 minutes long and uses 4 gallons of water per minute that is a nice 102 F in temperature. How much energy (kJ) must be used to heat the water for your shower if the water coming into your house is at 60 F? The heat capacity of water is 4....
Saturday, January 31, 2015 at 8:32pm

chemistry
Suppose you add 92 ml of dilute acid to 46 ml of water. Both the water and acid were at room temperature (22 C) before being mixed. The temperature of the solution increased to 39 C. How much energy (in kJ) was released by the dissolution of the acid if the specific heat ...
Saturday, January 31, 2015 at 8:26pm

Chemistry
I am having some chemistry problems. 3. The graph compares the 1s orbital energies for the F atom (Z = 9), the Ne+ ion (Z = 10), and the Na++ ion (Z = 11). (the graph shows F having an Orbital Energy of 692.45, Ne+ with 47.74, and Na++ with 33.52) a. How many electrons does ...
Saturday, January 31, 2015 at 7:43pm

chemistry
2C2H2(g) + 5O2(g)→4CO2(g) + 2H2O(g) a. Determine the enthalpy change for the reaction. ΔH = (4(-393.5)+ 2(-241.8)) – (2(227) + 5(0)) The enthalpy change is -2511.6. b. Determine the entropy change for the reaction. ΔS = (4(213.7)+ 2(188.7)) – (2(200.9...
Saturday, January 31, 2015 at 7:39pm

Chemistry
Answer the following questions about energy changes associated with heating and cooling a substance. Use the quantities in the table for your calculations. (table) Specific heat of water /4.184J/g*K dealta H vap for water /40.7 kJ/mol dealta H fus for water /6.02 kJ/mol dealta...
Saturday, January 31, 2015 at 7:30pm

chemistry
The figure shows a cube of air at pressure 1.0 atm above a hot surface on Earth. Contact with the hot surface causes the volume of the air to expand from 2.00 × 105 L to 2.20 × 105 L by the transfer of 8.2 × 106 J of heat. Assume the systems are isolated from...
Saturday, January 31, 2015 at 7:22pm

chemistry
A buffer solution is made by dissolving 0.45 moles of a weak acid (HA) and 0.23 moles of KOH into 720 mL of solution. What is the pH of this buffer? Ka = 6.2 × 10−6 for HA. Answer in units of pH. please i need the answerf
Saturday, January 31, 2015 at 6:28pm

chemistry
The ionization constant of HA is 1 × 10−6 . What must be the ratio of [A−] to [HA] for the preparation of a buffer solution with a pH of 6.77? whats the answeer??????
Saturday, January 31, 2015 at 6:28pm

chemistry
In the reaction below, ΔH°f is zero for ___________. Ni(s) + 2CO(g) + 2PF3(g) = Ni(CO)2(PF3)2(l) Ni(s) CO(g) Ni(CO)2(PF3)2(l) both CO(g) and PF3(g) PF3(g)
Saturday, January 31, 2015 at 6:20pm

chemistry
A buffer solution is made by dissolving 0.45 moles of a weak acid (HA) and 0.23 moles of KOH into 720 mL of solution. What is the pH of this buffer? Ka = 6.2 × 10−6 for HA. Answer in units of pH. i need the answer
Saturday, January 31, 2015 at 5:48pm

chemistry
What is the concentration of hydrogen ions in a solution containing 0.645 M HOCN (cyanic acid) and 0.235 M (NaOCN) (sodium cyanate)? The ionization constant of cyanic acid is 3.5 × 10−4 . Answer in units of M
Saturday, January 31, 2015 at 4:38pm

chemistry
What mass of solid sodium formate (of MW 68.01) must be added to 115 mL of 0.57 mol/L formic acid (HCOOH) to make a buffer solution having a pH of 4.16? Ka = 0.00018 for HCOOH. Answer in units of g
Saturday, January 31, 2015 at 4:37pm

chemistry
The enthalpy change for the following reaction is -483.6 kJ: 2H2(g) + O2(g) = 2H2O(g) Therefore, the enthalpy change for the following reaction is _______ kJ: 4H2(g) + 2O2(g) = 4H2O(g)
Saturday, January 31, 2015 at 2:02pm

Chemistry
What is the enthalpy change when 25 g's of PCl5 are decomposed /\ H= 90
Saturday, January 31, 2015 at 1:46pm

Chemistry
How many rams of 96.5% pure NaOH pellets do you need to make 1 liter of 1.5 N NaOH?
Saturday, January 31, 2015 at 12:10pm

chemistry
What is the specific heat capacity of ethanol (C 2H 6O) if a 18.3 g sample increased 12.3 C upon the addition of 553.0 J? The units are J/(g ·K)
Saturday, January 31, 2015 at 12:06pm

chemistry
The radiator in your car uses either water or ethylene glycol (anti-freeze) to remove heat from the engine and dissipate it to the outside air. If the water recirculation rate is 17.0 kg per minute of water and the water temperature leaving the engine and entering the ...
Saturday, January 31, 2015 at 12:01pm

chemistry
What is the molar mass of pentane if 4.18 ~ 1016 molecules of pentane weigh 5.00 ƒÊg?
Friday, January 30, 2015 at 9:54pm

chemistry
nearest star distance of 4.3 light years proxima centauri is the nearest star to our solar system. what is the distance to proxima centauri kilometers? the speed of light in space is 2.998 x10^8 m/s.
Friday, January 30, 2015 at 8:48pm

chemistry
A 0.97 m aqueous solution of an ionic compound with the formula MX has a freezing point of -2.5 ∘C .
Friday, January 30, 2015 at 7:11pm

Green Chemistry
The primary route for making copper iodide is by reacting potassium iodide with copper sulfate: 2CuSO4 + 4KI + 2Na2S2O3 ==> 2CuI + 2K2SO4 + 2NaI + Na2S4O6 Identify potential green chemistry and green engineering challenges of the reaction.
Friday, January 30, 2015 at 2:06pm

chemistry
I have to calculate the vapor pressure of water at 25.0 degrees celicus. The heat of vaporization of water is 40.65 kj/mol and the vapor pressure of water is 92.7 Torr at 50 degrees celcius. I know I should use log10 P=A- B/C+T but I don't know how to work it out.
Friday, January 30, 2015 at 2:16am

Chemistry
For a certain reaction, Kp = 3.54 at 325 C. Find delta G 598 K in kJ/mol.
Friday, January 30, 2015 at 1:15am

Chemistry
H= -20 kJ/mol and S= -75 kJ/mol A) is this process thermodynamicslly favored? B) does the equilibrium lie to the left, right, or close to the middle? For A I don't think it is. B?
Friday, January 30, 2015 at 12:20am

Chemistry
A chemical company claims that they are able to produce a certain product through thermodynamically favored process. Explain how this is possible?
Thursday, January 29, 2015 at 11:29pm

chemistry
Rank the following species according to the increasing energy needed to raise the temperature of 10.0 g of the substance by 25.0 ∘C. Aluminum-.897J/g water- 4.184J/g Stainless steel - .500J/g cast iron- .460J/g copper-.385J/g Can someone please show me how to figure this...
Thursday, January 29, 2015 at 11:02pm

Chemistry
In the process of separating pb2+ ions from cu+2 ions as sparingly soluble iodates, what is Pb2+ concentration when Cu+2 begins to precipitate as sodium iodate is added to a solution that is initially 0.0010M Pb(NO3)2 (aq) and 0.0010M Cu(NO3)2 (aq)? I know the answer is 1.8*10...
Thursday, January 29, 2015 at 8:57pm

chemistry
4FeS (s) + 7O2 (g) --> 2Fe2O3 (s) + 4SO2 (g) Entropy value for iron (II) sulfide is 67 J/K mol I don't understand how to find entropy
Thursday, January 29, 2015 at 8:21pm

Organic chemistry
What kind of reaction is occurring between potassium permanganate and cyclohexene? (I.e. Combination, double displacement, etc.
Thursday, January 29, 2015 at 8:08pm

Chemistry
I am having some chemistry problems. 3. The graph compares the 1s orbital energies for the F atom (Z = 9), the Ne+ ion (Z = 10), and the Na++ ion (Z = 11). (the graph shows F having an Orbital Energy of 692.45, Ne+ with 47.74, and Na++ with 33.52) a. How many electrons does ...
Thursday, January 29, 2015 at 8:07pm

Chemistry
Assuming equal concentrations and complete dissociation, rank these aqueous solutions by their freezing points. CoCl3 K2CO3 KNO3
Thursday, January 29, 2015 at 7:14pm

chemistry
if you burn 20.2g of hydrogen and produce 1.80x10^2g of water, how much oxygen reacted?
Thursday, January 29, 2015 at 6:57pm

Chemistry
Suppose you tired to carry out a double-replacement reaction by mixing together equal volumes of a solution that contained dissolved NaF and a solution that contained dissolved NaCl. Would you expect a reaction, if so write the balanced chemical equation?
Thursday, January 29, 2015 at 6:34pm

college chemistry
A sample of gas has an initial volume of 5.9L at a pressure of 759mmHg. If the volume of the gas is increased to 8.4L , what will the pressure be?
Thursday, January 29, 2015 at 6:03pm

Chemistry
27.31 mg of NH4Cl in 1.99 ✕ 10-2 L of solution cation ? And Anion ? (Molarity) I found the MW to be 62.48 and I converted Mg to 0.02731g idk what's wrong
Thursday, January 29, 2015 at 4:00pm

Chemistry
A 2.75 kg block of ice is heated until it completely melts. It is then heated again until it completely changes to water vapor. Is more energy required to melt the ice or to vaporize the liquid water.
Thursday, January 29, 2015 at 2:54pm

chemistry
If 1500 mg of rubbing alcohol is spilled in abox that measures 4m x 2m x 3m, what is the concentration of alcohol in mg. per cubic meter if it evaporates into gas?
Thursday, January 29, 2015 at 12:11pm

chemistry
What is the mass (in kilograms) of a cube of silver that measures 0.26m on each side
Thursday, January 29, 2015 at 11:03am

Chemistry
Which of the following is a balanced chemical equation H2O2 → H2O + O2 2 Fe2O3 + 3 C → 4Fe + 3CO2 SO2 + O2 + 2H2O →4H2SO4 2 Mg + HCl →MgCl2 + H2 not sure
Thursday, January 29, 2015 at 9:50am

Chemistry
Elements are constantly forming compounds, and the atoms of compounds are constantly being rearranged to form new combinations of atoms. True or false True
Thursday, January 29, 2015 at 9:26am

chemistry
calculate the amount of carbon dioxide that could produced when the one mole of carbon is burnt in 8gms of dry oxygen
Thursday, January 29, 2015 at 9:25am

Chemistry
consider the following reaction at 298K 4Al(s)+3O2(g) yields 2Al2O3(s) delta H= -3351.4 Kj find delta S sys find delta S surr find delta S unvi
Thursday, January 29, 2015 at 3:03am

chemistry 116
What is the specific heat capacity of aluminum if a 8.4 g sample increased 21.1 C upon the addition of 159.0 J? The units are J/(g ·K). q=cpxMxT is the equation my answer i got is 401.65 is that right bec i feel thats wrong
Thursday, January 29, 2015 at 2:02am

chemistry
what hybrid orbitals would be expected for the central atom for the followings a) BrF5 b) BeCl2 c) CH3Cl
Thursday, January 29, 2015 at 1:36am

Chemistry
How much of each of the following substances would you add to water to prepare 1.90 L of a 0.15 M solution? (a) H2SO4 from "concentrated" (18 M) sulfuric acid mL (b) HCl from "concentrated" (12 M) reagent mL (c) NiCl2 from the salt NiCl2·6 H2O g (d) ...
Wednesday, January 28, 2015 at 10:20pm

Chemistry
32.0=5.5x10^2(1/T)+14.2 Solve for T I am confused about what the first step would be to solving for T. Would I divide 5.5x10^2(1/T) and move it to the left side? Please help.
Wednesday, January 28, 2015 at 9:31pm

Chemistry
What is the formula of reactants for Dibromobis(Triphenylphosphine Oxide) Manganese(II)?
Wednesday, January 28, 2015 at 8:32pm

Chemistry
How would you make 100 mL of a carbonic acid buffer at 0.2 M and pH = 9.8 using 0.5 M HCO3 and either 0.1 M NaOH or 0.1 M HCl and water?
Wednesday, January 28, 2015 at 8:31pm

Science-Chemistry
Can you please help me solve r1/r2 = sqrt(M2/M1)for M1. My answer: M1=M2r2^2/r1^2 Is this correct?
Wednesday, January 28, 2015 at 8:03pm

Chemistry
Can you please help me solve r1/r2 = sqrt(M2/M1)for M1. My answer: M1=M2r2^2/r1^2 Is this correct?
Wednesday, January 28, 2015 at 7:47pm

chemistry
a 1.00*10^1 mL sample of an unknown liquid has a mass of 7.99 g. Calculate the density of the liquid using the proper number significant figures
Wednesday, January 28, 2015 at 7:37pm

Chemistry
Draw the Lewis structure for each of these molecules. 1. PH3 2. H2S 3. HCl 4. CCl4 5. SiH4
Wednesday, January 28, 2015 at 7:03pm

Chemistry
1. Write the balanced equation. Use ONLY this equation to reference how the reactions below will shift. Consider whether there is an addition, a removal, or no effect to the reaction. Co(H2O)6^2+ + 4Cl^- <--> CoCl4^2- + 6H2O 2. Write the equilibrium expression for the ...
Wednesday, January 28, 2015 at 6:16pm

chemistry
Find the percentage composition of (NH4)3PO4 What i dont understand is if the mass of the element isnt given how would i calculate?
Wednesday, January 28, 2015 at 5:29pm

chemistry
A solution of HClO is mixed and found to have a pH of 4.53. Find what the initial concentration of HClO was for this solution. Ka = 3.00 × 10−8 for HClO. Answer in units of mol/L please help this is due in 1 hour
Wednesday, January 28, 2015 at 5:08pm

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