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May 23, 2015

Homework Help: Science: Chemistry

Recent Homework Questions About Chemistry

Chemistry
Hydrogen sulfide decomposes according to the following reaction, for which Kc = 9.30 10-8 at 700°C. 2 H2S(g) 2 H2(g) + S2(g) If 0.46 mol H2S is placed in a 4.6 L container, what is the equilibrium concentration of H2(g) at 700°C? So I thought that by using ice H2 would...
Monday, March 9, 2015 at 11:36pm

chemistry
if a student mixes 250 grams of Na2O with 300 grams of H2O how many grams of NaOH ?
Monday, March 9, 2015 at 9:05pm

Science (Chemistry)
2. Perform this operation and report the answer to the correct number of significant figures: What is the mass of a cube of aluminum that is 4.0 cm on each edge? The density of aluminum is 2.7 g/cm^3. Show all calculations leading to an answer. (I think I solved this correctly...
Monday, March 9, 2015 at 8:50pm

chemistry
a solution is prepared by dissolving145 grams of NaNO3 in 100 grams of water at 80*C. the solution is then cooled to 10*C. how much of the solute will come out of the solution?
Monday, March 9, 2015 at 8:39pm

chemistry
When you add 0.320 g of sodium metal to an excess of hydrochloric acid, you find that 3330 J of heat are produced. What is the enthalpy of the reaction as written below? 2Na(s) + 2HCl(aq) --> 2NaCl(aq) +H2(g
Monday, March 9, 2015 at 7:36pm

Chemistry
In photography, unexposed silver bromide is removed from film by soaking the film in a solution of sodium thiosulfate, Na2S2O3. Silver ion forms a soluble complex with thiosulfate ion, S2O32-, that has the formula Ag(S2O3)23-, and formation of the complex causes the AgBr in ...
Monday, March 9, 2015 at 7:12pm

Chemistry
According to the kinetic theory, gases consist of particles that A. occupy considerable volume. B. are relatively close together. C. exert attractive and repulsive forces on other particles. D. have motion that is constant, random, and rapid. C?
Monday, March 9, 2015 at 6:09pm

chemistry
Absolute zero is A. the temperature at which the motion of particles theoretically ceases. B. defined as 0°C. C. the triple point for water. D. all of the above D?
Monday, March 9, 2015 at 5:49pm

Chemistry
Neutralization reaction HCL(aq) + NaOH(aq) -> NaCl(s) + H2O(l) Use your results to determine the netball change of the neutralization reaction, in kJ/mol of NaOH, Write the thermochemical equation for the neutralization reaction. I'm not sure how to even go about doing ...
Monday, March 9, 2015 at 4:52pm

chemistry 30
Calculate the enthalpy of reaction for the combustion of ethene.
Monday, March 9, 2015 at 4:06pm

Chemistry
What volume of oxygen gas is needed to react completely with 0.677 L of carbon monoxide gas (CO) to form gaseous carbon dioxide? Assume all volume measurements are made at the same temperature and pressure. Thanks in advance for all help!!
Monday, March 9, 2015 at 4:03pm

chemistry
What volume of oxygen gas can be collected at 1.26 atm pressure and 2.00◦C when 39.7 g of KClO3 decompose by heating, according to the following equation? 2 KClO3(s) ∆/MnO2 −−−−→ 2 KCl(s) + 3 O2(g) Answer in units of L.
Monday, March 9, 2015 at 2:46pm

chemistry
How many kilocalories are required to produce 12.7g of aluminum?
Monday, March 9, 2015 at 11:37am

chemistry
How many kilocalories are required to produce 1.83mol of aluminum?
Monday, March 9, 2015 at 11:37am

chemistry
How much heat (in kilocalories) is released when 7.87g of Al is used in the reaction?
Monday, March 9, 2015 at 11:36am

chemistry
How many Calories (that is, kilocalories) are in a 37.8g serving of potato chips if we assume that they are essentially 50% carbohydrate, and 50% fats? [Energy from Food, p. 189 in the textbook]
Monday, March 9, 2015 at 11:36am

chemistry
'Manganese(III) fluoride, MnF3, can be prepared by the following reaction: 2MnI2(s) + 13F2(g) ? 2MnF3(s) + 4IF5(l) If the percentage yield of MnF3 is always approximately 56%, how many grams of MnF3 can be expected if 10.0 grams of each reactant is used in an experiment?'
Monday, March 9, 2015 at 12:37am

Chemistry, pH
What is the (OH-) when pH = 4.25
Sunday, March 8, 2015 at 10:59pm

chemistry
5oocm3 of 1.0 mol dm3 of sodium hydroxide solution at room temperature was placed in a styrofoam cup and 25cm3 of 2.0 mol-dm3 of hydrochloric acid was added at the same temperature.The temperature rose by 15.2 degrees celsius. Calculate the heat of neurtralization
Sunday, March 8, 2015 at 10:28pm

Chemistry 30
A mass of 45.0g of molten silver at its melting point is poured into 750mL of calorimeter water at 25.0C. The final temperature reached by both is 30.0C. If the specific heat capacity of silver is 0.235 kJ/kgC, calculate the molar heat of solidification of silver.
Sunday, March 8, 2015 at 9:34pm

chemistry
Write and balance each of the following equations, and then identify each by type. a) copper+chlorine-->copper(ll)chloride b) calcium chlorate--->calcium chloride+oxygen c)lithium+water--->lithium hydroxide+hydrogen d)lead(ll)carbonate--->lead(ll)oxide+​...
Sunday, March 8, 2015 at 9:31pm

chemistry
Write and balance each of the following equations, and then identify each by type. a) copper+chlorine-->copper(ll)chloride b) calcium chlorate--->calcium chloride+oxygen c)lithium+water--->lithium hydroxide+hydrogen d)lead(ll)carbonate--->lead(ll)oxide+​...
Sunday, March 8, 2015 at 9:14pm

Chemistry
A 11.0g sample of a compound containing only oxygen and carbon produce 3.0g carbon and 8.0g oxygen. Determine the empirical formula of the compound.
Sunday, March 8, 2015 at 7:20pm

chemistry
2.56 grams of zinc react with excess phosphoric acid to produce how many molecules of hydrogen gas?
Sunday, March 8, 2015 at 6:49pm

chemistry - PLEASE HELP
Spectroscopic studies have shown that the fusion reaction in the sun's core proceeds by a complicated mechanism. One proposed overall equation for the solar fusion reaction is 411H+2 0−1e→42He which is also accompanied by the release of "massless" ...
Sunday, March 8, 2015 at 5:03pm

chemistry
calculate the mass of barium hydroxide required to prepare 2.0L of a 0.500mol/L solution. I got 342.64 g.
Sunday, March 8, 2015 at 4:57pm

chemistry
how many liters of SO2 measured at STP are produced in the reaction of 6.27 kilogrrams with 234 Liters of O2 at 220 degrees celsius and 2 atm?
Sunday, March 8, 2015 at 4:52pm

Chemistry
Complete combustion of propane (C3H8). How many grams of water are produced when 50 grams of propane are reacted with 101 liters of oxygen @STP? Please explain in deminsionsl analysis and how you type it in the calculator. Thanks c:
Sunday, March 8, 2015 at 4:51pm

Chemistry
In de Broglie's equation w=wavelength w=h/mv how do i rearrange to solve for mass
Sunday, March 8, 2015 at 4:17pm

Chemistry
I need to figure out the molarity in the problem. A) 3.60g of sulfuric acid in 450.0mL of solution I was going to take 3.60 / 450.0mL = 0.008 B) 2.0 x 10-3 mol Iron(II)nitrate in 12.0mL of Solution 10 *3=30 then I was going to take 30*2.0 =60 60/12.0= 5 I am not sure if this ...
Sunday, March 8, 2015 at 4:05pm

Chemistry
What is the percentage yield for a reaction if you predicted the formation of 21 grams of C6H12 and actually recovered only 3.8 grams?
Sunday, March 8, 2015 at 3:44pm

Chemistry
What is the method used to separate water from bleached wood pulp?
Sunday, March 8, 2015 at 3:30pm

Chemistry
How many liters of oxygen a@STP will produce 195 grams of diphosphorus pentoxide when reacted with sufficient phosphorus?- exact question. Could someone plz help I am confused and if you could help me put it in dimensional analysis.
Sunday, March 8, 2015 at 3:26pm

chemistry
A mixture of 3.00 volumes of H2 and 1.00 volume of N2 reacts at 344 C to form ammonia. The equilibrium mixture at 110.0 atm contains 47.00 % NH3 by volume. Calculate Kp for the reaction, assuming that the gases behave ideally.
Sunday, March 8, 2015 at 1:01pm

Chemistry
A single titration was performed which required 12.60 mL of 0.100 M Na2S2O3. The density of the original, undiluted unknown bleach was 1.040 g/mL. Calculate the number of moles of ClO- in the sample titrated.
Sunday, March 8, 2015 at 12:24pm

Chemistry
6Li(s) + N2(g) 2Li3N(s) a) What mass of lithium is required to produce 0.575 g of Li3N in the balanced reaction? b) What mass of nitrogen is required for the reaction? ----------------------------------------​--- I tried dimensional analysis in a couple different ways ...
Sunday, March 8, 2015 at 11:47am

chemistry
Why people feel thirsty after eating salty foods. explain in terms of colligative property
Sunday, March 8, 2015 at 11:11am

AP Chemistry
Suppose you have added 200.0 mL of a solution containing 0.5000 moles of acetic acid per liter to 100.0 mL of 0.50000 M NaOH. What the is the final pH? The Ka of acetic acid is 1.77 x 10^-5.
Sunday, March 8, 2015 at 1:06am

chemistry
Liquid hexane will react with gaseous oxygen to produce gaseous carbon dioxide and gaseous water . Suppose 43.9 g of hexane is mixed with 57. g of oxygen. Calculate the minimum mass of hexane that could be left over by the chemical reaction. Round your answer to significant ...
Saturday, March 7, 2015 at 11:56pm

chemistry
A scientist measures the standard enthalpy change for the following reaction to be -172.4 kJ : 2SO2(g) + O2(g) 2SO3(g) Based on this value and the standard enthalpies of formation for the other substances, the standard enthalpy of formation of SO2(g) is what in kJ/mol?
Saturday, March 7, 2015 at 9:58pm

Chemistry :/
Experiment 1 results: mass of crucible 88g mass of hydrate 93g mass of salt 91.196g 1. Calculate the following: a:mass of water in the hydrate sample (g) b:number of moles of water in the sample c:mass of pure salt in the sample (g) d:number of moles of salt in the sample e:...
Saturday, March 7, 2015 at 9:00pm

Chemistry
Experiment 1 results: mass of crucible 88g mass of hydrate 93g mass of salt 91.196g 1. Calculate the following: a:mass of water in the hydrate sample (g) b:number of moles of water in the sample c:mass of pure salt in the sample (g) d:number of moles of salt in the sample e:...
Saturday, March 7, 2015 at 8:57pm

chemistry
A sample of tin (Cp = 0.227 J/g•°C) is placed in a freezer. Its temperature decreases from 15.0°C to −10.0°C as it releases 543 J of energy. What is the mass of the sample?
Saturday, March 7, 2015 at 6:38pm

chemistry
why doesnt the radius ratio rule work for TlCl3??? the division would be the radius of the cation / radius of the anion. For Tl3+ and Cl-...88pm/181pm = .49 which would correspond to a 'zinc blende' crystal structure and not a CsCl type crystal as the rest of the ...
Saturday, March 7, 2015 at 2:27pm

chemistry
Monosodium glutamate (MSG), a food-flavor enhancer, has been blamed for “Chinese Restaurant Syndrome,” the symptoms of which are headaches & chest pains. MSG has the following composition by mass: 35.51 percent C, 4.77 percent H, 37.85 percent O, 8.29 percent N, & 13...
Friday, March 6, 2015 at 11:24pm

Chemistry
Monosodium glutamate (MSG), a food-flavor enhancer, has been blamed for “Chinese Restaurant Syndrome,” the symptoms of which are headaches & chest pains. MSG has the following composition by mass: 35.51 percent C, 4.77 percent H, 37.85 percent O, 8.29 percent N, & 13...
Friday, March 6, 2015 at 11:18pm

organic chemistry
Hi! If you could help me in on how to do Organometallics reaction and mechanisms. Im totally lost. Any website or videos that could help me. I have search in youtube but the videos that i watched werent helpful
Friday, March 6, 2015 at 10:17pm

chemistry
In 3-4 sentences, identify how the geometric structure of NF3 is different than that of NF4+. Explain how the geometry affects the ability of the molecules to experience a dipole affect.
Friday, March 6, 2015 at 10:01pm

Chemistry
Calculate pH of a solution that is 0.255M in CH3NH2 and 0.105M in CH3NH3Br
Friday, March 6, 2015 at 5:35pm

Chemistry
Calculate the pH of a solution that is 0.185M in HC2H3O2 and 0.125M in KC2H3O2
Friday, March 6, 2015 at 5:09pm

chemistry
As a result of mineral erosion and biological activity, phosphate ion is common in natural waters, where it often precipitates as insoluble salts, such as Ca3(PO4)2. Calculate Qsp when [Ca2+]init = [PO43-]init = 2.161 10-6 M in a given river. Ksp of Ca3(PO4)2 = 1.2 ✕ 10...
Friday, March 6, 2015 at 2:54pm

Chemistry
Propane gas (C3H8) burns completely in the presence of oxygen gas (O2) to yield carbon dioxide gas (CO2) and water vapor (H2O). Write a balanced equation for this reaction. Assuming that all volume measurements occur at the same temperature and pressure, how many liters of ...
Friday, March 6, 2015 at 2:41pm

Chemistry
The Russian Mir space station used a chemical oxygen generator system to make oxygen for the crew. The system ignited a tube of solid lithium perchlorate (LiClO4) to make oxygen and lithium chloride (LiCl): LiClO4 (s) ---> 2O2 (g) + LiCl (s) If you have 500 g of LiClO4, ...
Friday, March 6, 2015 at 2:40pm

chemistry
If silver phosphate has a Ksp of 2.28e-16 at a certain temperature, what is the molar solubility of silver phosphate at the same temperature?
Friday, March 6, 2015 at 1:40pm

Chemistry
Light from three different lasers (A, B, and C), each with a different wavelength, was shined onto the same metal surface. Laser A produced no photoelectrons. Lasers C and B both produced photoelectrons, but the photoelectrons produced by laser C had a greater velocity than ...
Friday, March 6, 2015 at 8:43am

chemistry
How many grams of water will be produced by the reaction of 7.00g NH3 of 9.00g of NO?
Thursday, March 5, 2015 at 11:15pm

Chemistry
a) A current of 1.50 Amperes passes through a solution of AgNO3 for 3.0 hours. What mass, in grams, of silver collects on the cathode? (molar mass of silver = 107.9 g/mol) b) How many seconds would it take to collect 100 g of silver to collect on the cathode if 1.50 Amperes ...
Thursday, March 5, 2015 at 10:50pm

Chemistry
Phosphoric acid, H3PO4(aq), is a triprotic acid, meaning that one molecule of the acid has three acidic protons. Estimate the pH, and the concentrations of all species in a 0.250 M phosphoric acid solution. [H3PO4] = ? [H2PO4^-] =? [HPO4^2-]=? [PO4^3-]=? [H^+]=? [OH^-]=? pH=?
Thursday, March 5, 2015 at 10:32pm

chemistry
If four grams of Oxygen and four grams of Helium are placed in a five liter vessel at 338 K, what will be the partial pressure of each gas and the total pressure in the vessel?
Thursday, March 5, 2015 at 8:34pm

chemistry
In a reaction involving the iodination of acetone, the following volumes were used to make up the reaction mixture: 10 mL 5.0 M acetone + 10 mL 1.5 M HCl + 10 mL 0.005 M I2 + 20 mL H2O A student found that it took 400 seconds for the color of the I2 to disappear. a) How many ...
Thursday, March 5, 2015 at 6:39pm

Chemistry
A .2688-g sample of a monoprotic acid neutralizes 16.4 mL of .08133 M kOH solution, calculate the molar mass of the solution? First of all how can I calculate the molar mass?
Thursday, March 5, 2015 at 6:04pm

chemistry
Hot air balloons gain their lift from the reduction in the density of air that occurs when the air in the envelope is heated. To what temperature should you heat a sample of air (initially at 374 K) to increase its volume by 13%? Answer in units of K. thanks for helping !
Thursday, March 5, 2015 at 6:03pm

chemistry
A container of gas at 24 psi is compressed to one eighth its original volume. What is the new pressure of the gas? Answer in units of psi.
Thursday, March 5, 2015 at 5:49pm

CHEMISTRY!!!!
Determine the pH at the equivalence point in the titration of 41.0 mL 0.096 M formic acid with 0.108 M NaOH at 25oC. Calculate the pH of a solution that is 0.22 M pyridinium ion (C5H5NH+) at 25oC.
Thursday, March 5, 2015 at 4:57pm

Chemistry
Complete and balance the molecular equation, including phases, for the reaction of aqueous iron(III) nitrate, Fe(NO3)3 and aqueous lithium hydroxide, LiOH Enter the balanced net ionic equation, including phases, for this reaction.
Thursday, March 5, 2015 at 3:43pm

Inorganic Chemistry
Which of the following species contain an inversion center? Choose all that apply. SeF6 [IF4]- SnF4 InH3
Thursday, March 5, 2015 at 3:27pm

Inorganic Chemistry
Which of the following molecules contain a C3 axis but not a σh plane? AlCl3 SeO3 SbBr3 PCl3
Thursday, March 5, 2015 at 3:26pm

Inorganic Chemistry
Which of the following species contain a C4 axis and a σh plane? Choose all that apply. [ICl4]- SiCl4 XeF4 GeH4 [PO4]3
Thursday, March 5, 2015 at 3:25pm

chemistry
A chemist prepares a sample of hydrogen bromide and finds that it occupies 249 mL at 60◦C and 552 Torr. What volume would it occupy at 0◦C at the same pressure? Answer in units of mL
Thursday, March 5, 2015 at 3:07pm

Chemistry
A 20.0-mL sample of 0.300 M HBr is titrated with 0.150 M NaOH. What is the pH of the solution after 40.3 mL of NaOH have been added to the acid?
Thursday, March 5, 2015 at 2:19pm

chemistry
how do i find a name and formula for a combination of an anion and a cation? ex: Na2CO3 + Ba(NO3)2
Thursday, March 5, 2015 at 2:06pm

chemistry
how do i find a name and formula for a combination of an anion and a cation? ex: Na2CO3 + Ba(NO3)2 please help!
Thursday, March 5, 2015 at 1:46pm

chemistry 12u
2NH(g) +2.5O2(g) ---><--- 2NO(g) + 3H2O(g) + Heat
Thursday, March 5, 2015 at 11:14am

Ap chemistry
Suppose NaOH is added to the following system when it is at equilibrium. NH3 (aq) + H2O (l) = NH4 (aq) + OH (aq) a) in which direction will the reaction shift after the NaOH is added? b) will this stress increase or decrease the value of the reaction quotient, Q? C) will the ...
Thursday, March 5, 2015 at 10:52am

CHEMISTRY
HOW MANY MOLES OF SILVER IODIDE COULD BE PRODUCED IF THIS REACTION WAS STARTED WITH 4.3 MOL IODINE AND AN EXCESS OF SILVER?
Thursday, March 5, 2015 at 7:11am

chemistry
How many moles of hydrogen would be obtained if 2.7g of aluminium reacts with excess hydrochloric acid?
Thursday, March 5, 2015 at 4:24am

Chemistry
The mass of spectrum of 2,4-dimethylpentane shows peaks at m/z 43, 57, and 85. Show the fragments which produce these peaks.
Thursday, March 5, 2015 at 12:13am

chemistry
the vapor pressure of carbon sulfide is 355.6 torr at 25 degrees Celsius. what is the vapor pressure of a solution prepared by dissolving 12.52 g naphthalene (C10H8, 128.2 g/mol) in 125.0 mL CS2 liquid (76.14 g/mol, 1.261 g/mL)? Assume the solution obeys Raoult's law, and ...
Wednesday, March 4, 2015 at 10:31pm

Chemistry
Name three properties of metal for which metallic bonds are responsible
Wednesday, March 4, 2015 at 9:51pm

Chemistry
At 19.0°C, what is the fraction of collisions with energy equal to or greater than an activation energy of 151.0 kJ/mol? I got 1.06 which wasn't right
Wednesday, March 4, 2015 at 9:42pm

CHEMISTRY
How many grams of sulphuric acid (H2SO4) are needed to make 1.5L of a 1.5 molar solution? ~~~~~~~~ Here's my work so far: 1.5L x 1.5mol/L = 2.25molH2SO4 2.25mol H2SO4 x 98.09g H2SO4 / 1mol H2SO4 = 220.7025g H2SO4 I wanted to ask if my work is correct, because I am unsure ...
Wednesday, March 4, 2015 at 9:22pm

Chemistry
Calculate the pH of a buffer that is 0.130M in NaHCO3 and 0.295M in Na2CO3
Wednesday, March 4, 2015 at 4:31pm

Chemistry
After 62.0 min, 11.0% of a compound has decomposed. What is the half-life of this reaction assuming first-order kinetics?
Wednesday, March 4, 2015 at 2:48pm

Chemistry
Help i am trying to plot data and then determine the best value of R. my data P(atm) 2.014,2.797,3.571,4.114 and V(L) 21.153,15.231,11930,10.355. there is more data but if I am given the process at starting place I would like to complete myself. thank you
Wednesday, March 4, 2015 at 2:38pm

Chemistry
5.0x101 mg of NaCl is added to 0.100 L of a 1.4x10-2 M solution of Pb(NO3)2. Calculate the resulting equilibrium concentration of Pb2+ after mixing. Show all work.
Wednesday, March 4, 2015 at 1:09pm

CHEMISTRY
HOW MANY MOLES OF SILVER IODIDE COULD BE PRODUCED IF THIS REACTION WAS STARTED WITH 4.3 MOL IODINE AND AN EXCESS OF SILVER?
Wednesday, March 4, 2015 at 12:59pm

Chemistry
Please help! I have 30 ml bottle of 5% hydrocholric acid. Ned to dillute to make 200 ml of .01 M hydrocholric acid. I dont know how much of the bottle solution to add to how much distilled water to get 200 ml at .01 M
Wednesday, March 4, 2015 at 12:52pm

Chemistry Dr. Bob222
For Cup C Mass of cup,water,stirrer: 55.15 Mass of sodium bicarbonate: 2.02g mass of citric acid: 0.77g total mass: 57.94g mass of cup,solution, stirrer after reaction: 57.64 difference (CO2): 0.30g Calculate the theoretical yield of carbon dioxide in the plastic cup C. ** u ...
Wednesday, March 4, 2015 at 11:19am

Chemistry
how much heat is absorbed when 63.7 grams of water at 100 degrees Celsius is converted to steam at 100 degrees Celsius? -I need help figuring out how to do this.
Wednesday, March 4, 2015 at 11:12am

Chemistry
5% hydrocholric acid in 30ml (1 fl oz) - how to dillute to make 200 ml of .01 M? I think i need to first fin concentration solute /amount of solution x 100 .05/30 x100 = .166 Then i get lost!
Wednesday, March 4, 2015 at 10:42am

chemistry
What is the equation that represents the reaction of esterification of crystal violet? Thanks
Wednesday, March 4, 2015 at 10:39am

Chemistry
Calculate the pOH of a 0.410 M Ba(OH) solution.
Wednesday, March 4, 2015 at 10:24am

Chemistry
what is the PH of a solution of .1 M NAN3 that disassociates into HN3
Wednesday, March 4, 2015 at 10:05am

English *Answers Check*
What is acupuncture? 1 Acupuncture is one of the oldest, most commonly used medical procedures in the world. Originating in China more than 2,000 years ago, acupuncture began to become better known in the United States in 1971, when New York Times reporter James Reston wrote ...
Wednesday, March 4, 2015 at 8:04am

chemistry
how many grams of CuSO4.5H2O is needed to prepare 0.01 M solution?
Wednesday, March 4, 2015 at 1:33am

Chemistry
Magnesium hydroxide, Mg(OH)2, found in milk of magnesia, has a solubility of 7.05 × 10-3 g L-1 at 25 °C. Calculate Ksp for Mg(OH)2.
Wednesday, March 4, 2015 at 1:26am

Chemistry Dr. Bob222
Ok, For Cup C Mass of cup,water,stirrer: 55.15 Mass of sodium bicarbonate: 2.02g mass of citric acid: 0.77g total mass: 57.94g mass of cup,solution, stirrer after reaction: 57.64 difference (CO2): 0.30g Part B: Limiting Reactants Plastic Cup C 7. Determine which reactant is ...
Wednesday, March 4, 2015 at 1:02am

Chemistry
Consider the titration of 30.0 mL of 0.100 M NH3 with 0.150 M HCl. calculate the pH after the following volumes of titrant have been added:(a) 0mL (b) 10.0 mL (c) 19.5 mL (d) 20.0 mL (e) 20.5 mL (f) 30 mL
Wednesday, March 4, 2015 at 12:00am

chemistry
Given the following thermochemical data: H2O(l)+2AgNO3(aq) ¡æ 2HNO3(aq)+Ag2O(s) ¥ÄH = 44.8 kJ 2Ag(s)+¨öO2(g) ¡æ Ag2O(s) ¥ÄH = -31.0 kJ ¨öO2(g)+H2(g) ¡æ H2O(l) ¥ÄH = -285.8 kJ Use Hess¡¯...
Tuesday, March 3, 2015 at 11:42pm

chemistry
Given the following data: 4PCl5(s) ¨ P4(s) + 10Cl2(g) ƒ¢H = +1774 kJ P4(s) + 6Cl2(g) ¨ 4PCl3(l) ƒ¢H = -1278.8 kJ Find the ƒ¢H of the following reaction: PCl5(s) ¨ PCl3(l) + Cl2(g)
Tuesday, March 3, 2015 at 11:41pm

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