Saturday
May 30, 2015

Homework Help: Science: Chemistry

Recent Homework Questions About Chemistry

chemistry help
What mass of ammonium chloride must be added to a 0.500 L solution of 0.250 M ammonia to make a buffer with a pH of 9.26? Kb (NH3) = 1.8 × 10–5?
Monday, March 30, 2015 at 7:52am

physical chemistry
calculate late the Gibbs free energy, entropy and enthalpy of mixing when 500g of heptane is mixed with 500g oh hexane at 298K.
Monday, March 30, 2015 at 2:49am

AP Chemistry
A 5.0 M solution of HNO3 is titrated with 0.3 M NaOH. Identify the species that have the highest concenttrations in the solution being titrated halfway to the equivalence point. A 25.15 ml of 0.35 m HNO3 was titrated with an unknown concentration of NaOH. The endpoint was ...
Sunday, March 29, 2015 at 11:41pm

chemistry
what would be the final concentration if you incorporate 11m: of 29'' concentration of HF to 800mL of water?
Sunday, March 29, 2015 at 11:19pm

chemistry
Determine the limiting reactant for this reaction if 3.027 grams of Aluminum are reacted with 60.00 mL of a solution that is 6 M KOH. Determine the amount of KAl(SO4)2•12 H2O that can be produced from this reaction. Molar mass Alum = 474 g/mol 2 Al (s) + 2 KOH (aq) + 22 ...
Sunday, March 29, 2015 at 11:03pm

Chemistry
You have 100 mL of a 0.450 M sulfuric acid solution, but you now need to add NaOH to make the solution basic. How much NaOH ( in grams) will you need to add to make the solution have a pH of 13.0? The units are grams of NaOH.
Sunday, March 29, 2015 at 10:39pm

chemistry
What is the total change in entropy when 10.0 g of ice melts at 25.0°C? DHfus = 6.01 kJ/mol The answer is 1.03 J/K but idk how to find it.
Sunday, March 29, 2015 at 10:38pm

chemistry
calculate the pH after 0.02 mol NaOH is added to 1.00 L of .1 M sodium propanoate NaC3H5O2
Sunday, March 29, 2015 at 8:47pm

Chemistry
a gas is placed in a 3.56L flask at 1.00 atm pressure. If the volume of the flask is reduced by half, what is the new pressure? V-3.56 P-1.00 I don't know what formula to use and how to apply it.
Sunday, March 29, 2015 at 8:19pm

Chemistry
Sulfuric acid dissolves aluminum metal according to the following reaction: 2Al(s)+3H2SO4(aq)→Al2(SO4)3(aq)+3H​2(g) Suppose you wanted to dissolve an aluminum block with a mass of 14.5g . 1.) What minimum mass of H2SO4 would you need? 2.)What mass of H2 gas would ...
Sunday, March 29, 2015 at 7:20pm

Chemistry
A helium-filled balloon has a volume of 2.68 L at 15◦C. The volume of the balloon decreases to 2.33 L after it is placed outside on a cold day. What is the outside temperature in K? Answer in units of K.
Sunday, March 29, 2015 at 7:10pm

chemistry
what is the delta Hvap of a liquid that has a vapor pressure of 612 torr at 77.6 degrees C and a boiling point of 94.9 degrees C at 1 atm
Sunday, March 29, 2015 at 6:14pm

Chemistry help
A gas occupying 29 mL at standard conditions is heated to 14◦C while the pressure is reduced to 0.98682 atm. What is the new volume occupied by the gas?
Sunday, March 29, 2015 at 6:12pm

Chemistry
For the substance SO2F2(g), ΔHºf = -858 kJ mol-1 and the S-F bond, 308.0 kJ mol-1 Determine the average S=O bond energy in SO2F2 in units of kJ. Is my answer right, if so how do I convert this to kJ? x= S=O bond -858= 2(308) + 2(x) -737kJ/mol
Sunday, March 29, 2015 at 5:20pm

Chemistry
A 1.0-g sample of MgCl2 produced a 10.00C increase in a calorimeter charged with 40.0mL of deionized water. The specific heat is of MgCl2 is 0.750J/C*g. What is the value of delta(s)H for MgCl2? I know that the formula needed is delta(s)H=-([massH2O*deltaTH20]+[mass(Mg​...
Sunday, March 29, 2015 at 5:10pm

Pre Ap Chemistry
A sample of carbon dioxide gas occupies 566 mL at 0.825 atm and 15 ◦C. What will the pressure be at a volume of 834 mL and a temperature of 20◦C
Sunday, March 29, 2015 at 4:30pm

Chemistry
What pressure is required to reduce 34 mL of a gas at standard conditions to 16 mL at a temperature of 20◦C
Sunday, March 29, 2015 at 3:50pm

Chemistry
What intermolecular forces are responsible for neoprene's stretchiness?
Sunday, March 29, 2015 at 3:39pm

chemistry
What is the delta Hvap of a liquid that has a vapor pressure of 612 torr at 77.6 degrees C and a boiling point of 94.9 degrees C at 1 atm?
Sunday, March 29, 2015 at 3:34pm

chemistry
What is the delta Hvap of a liquid that has a vapor pressure of 612 torr at 77.6 degrees C and a boiling point of 94.9 degrees C at 1 atm?
Sunday, March 29, 2015 at 3:20pm

chemistry
What is the delta Hvap of a liquid that has a vapor pressure of 612 torr at 77.6 degrees C and a boiling point of 94.9 degrees C at 1 atm
Sunday, March 29, 2015 at 3:18pm

chemistry
Hydroxyapatite is the main mineral component of bone. How many grams of hydroxyapatite will dissolve in 1.00 L of H2O? Ksp = 2.34 × 10–59; Molar mass = 502.3 g/mol? I keep getting 5.83x10^-18 g but the answer is supposed to be 4.35x10^-5 g. I don't understand why
Sunday, March 29, 2015 at 3:15pm

Chemistry
Hi, can you help me with this question: "you have 25.00 mL of a 0.1000 M sugar solution. How much water must be added to make a 0.025 M solution? Thank you.
Sunday, March 29, 2015 at 1:42pm

Chemistry
calculate the molarity of cl- ions in a solution made from mixing 50.0 ml of a 0.100 m/l solution of ferric chloride with 50.0 ml of a 0.500 mol/l solution of ammonium chloride
Sunday, March 29, 2015 at 12:36pm

Chemistry
Calculate the percentage yield if, on heating 50g of limestone(CaCO3), 21 g of lime(CaO) were obtained.
Sunday, March 29, 2015 at 12:17pm

chemistry
What is the delta Hvap of a liquid that has a vapor pressure of 612 torr at 77.6 degrees C and a boiling point of 94.9 degrees C at 1 atm
Sunday, March 29, 2015 at 11:44am

chemistry
What is the delta Hvap of a liquid that has a vapor pressure of 612 torr at 77.6 degrees C and a boiling point of 94.9 degrees C
Sunday, March 29, 2015 at 11:20am

Chemistry
What volume of carbon tetrachloride (density = 2.71 g/mL) contains 2.46x10^25 chlorine atoms? I did: 2.46x10^25 Cl atoms x 1 atom/4 atoms x 1 mol/6.02x10^23 x 154 g/1 mol x 1 mL/2.71 g And the correct answer is apparently 572 mL when I got 581 mL.
Sunday, March 29, 2015 at 10:59am

Chemistry
What volume of carbon tetrachloride (density = 2.71 g/mL) contains 2.46x10^25 chlorine atoms?
Sunday, March 29, 2015 at 9:20am

Chemistry
Weight of solution is 1026gm in aqueous solution.what will be the weight of per kg H2O?
Sunday, March 29, 2015 at 5:55am

Chemistry
Molality of aqueous solution of urea is 4.What will be the mole fraction ofH2O?
Sunday, March 29, 2015 at 5:47am

chemistry
PH of gatorade and body sweat
Sunday, March 29, 2015 at 12:05am

Grade 11 Chemistry
Calculate the concentration of I- in an aqueous solution prepared in a 250 ml volumetric flask from 50.0 ml of a 0.840 mol/L aluminum iodide solution and 160.0 ml of a 0.500 mol/L tin(IV) iodide solution.
Saturday, March 28, 2015 at 11:38pm

Grade 11 Chemistry
calculate the molarity of cl- ions in a solution made from mixing 50.0 ml of a 0.100 m/l solution of ferric chloride with 50.0 ml of a 0.500 mol/l solution of ammonium chloride
Saturday, March 28, 2015 at 11:22pm

SUPER HARD CHEMISTRY
a solution containing 100.0 mL of 0.135 M CH3COOH (ka=1.8E-5) is being titrated with 0.54 M NaOH. calculate the ph: at the equivalence point
Saturday, March 28, 2015 at 11:08pm

HARD COLLEGE CHEMISTRY
a solution containing 100.0 mL of 0.135 M CH3COOH (ka=1.8E-5) is being titrated with 0.54 M NaOH. calculate the ph: at the equivalence point and 5 mL past the equivalence point. how much is 5 mL past? i do not know how to do it?
Saturday, March 28, 2015 at 10:53pm

chemistry
What mass of ammonium chloride must be added to a 0.500 L solution of 0.250 M ammonia to make a buffer with a pH of 9.26? Kb (NH3) = 1.8 × 10–5?
Saturday, March 28, 2015 at 10:21pm

Chemistry
A 1.0-g sample of MgCl2 produced a 10.00C increase in a calorimeter charged with 40.0mL of deionized water. The specific heat is of MgCl2 is 0.750J/C*g. What is the value of delta(s)H for MgCl2? I know that the formula needed is delta(s)H=-([massH2O*deltaTH20]+[mass(Mg​...
Saturday, March 28, 2015 at 10:20pm

COLLEGE CHEMISTRY HARD
calculate the ph at the equivalence point for the titration of 0.01 M Ch3COOH with 0.1 M NaoH ka= Ch3Cooh 1.8E-5 idek how to do it?
Saturday, March 28, 2015 at 8:08pm

college chemistry HARD
a solution containing 100.0 mL of 0.135 M CH3COOH (ka=1.8E-5) is being titrated with 0.54 M NaOH. calculate the ph: at the equivalence point and 5 mL past the equivalence point. how much is 5 mL past? i do not know how to do it?
Saturday, March 28, 2015 at 8:07pm

Chemistry
If 84.1 g of sodium hydroxide are reacted with 51.0 g of aluminum in the following equation: 2NaOH + 2Al + 2H2O --> 2NaAlO2 + 3H2 a) what mass of excess reactant remains? b) what mass of water would react?
Saturday, March 28, 2015 at 6:45pm

chemistry
dissolving 4.022 g of a salt in 100 mL of water changes temperature by -1.2^oC: what is the heat absorbed? The specific heat of water is 4.184 J/(g*C)
Saturday, March 28, 2015 at 6:22pm

chemistry
What is the total change in entropy when 10.0 g of ice melts at 25.0°C? DHfus = 6.01 kJ/mol The answer is 1.03 J/K but idk how to find it.
Saturday, March 28, 2015 at 6:20pm

chemistry
What is the formula for the following problem What is the kinetic energy, in joules of a mole of oxygen moving at a speed of 225m s ⁻1? Should I use KE= 1/2mv2 Thanks
Saturday, March 28, 2015 at 3:55pm

Chemistry
Use half reaction to balance: CuS + NO3^- = Cu(NO3)2 + NO2 + SO2 S^2- = SO2 S Oxidized Cu^2+ + NO3^- = NO2 + Cu(NO3)2 N Red After balancing the atoms & balancing the charges, I cannot get all the correct coefficients
Saturday, March 28, 2015 at 3:32pm

chemistry
calculate the ph at the equivalence point for the titration of .1 M NH3 and .1 M HCl. kb NH3= 1.8E-5 how you do it?
Saturday, March 28, 2015 at 3:10pm

chemistry
calculate the ph at the equivalence point for the titration of 0.01 M Ch3COOH with 0.1 M NaoH ka= Ch3Cooh 1.8E-5 idek how to do it?
Saturday, March 28, 2015 at 3:04pm

chemistry
a solution containing 100.0 mL of 0.135 M CH3COOH (ka=1.8E-5) is being titrated with 0.54 M NaOH. calculate the ph: at the equivalence point and 5 mL past the equivalence point. how much is 5 mL past? i do not know how to do it?
Saturday, March 28, 2015 at 2:30pm

Chemistry
A 1.500 mol sample of PCL5 dissociates at 160C and 1.00 atm to give 0.203 mol of PCL3 at equilibrium. What is the composition of the final reaction mixture?
Saturday, March 28, 2015 at 1:36am

chemistry
What is the total concentration of cations in a solution made by combining 700.0 mL of 3.0 M (NH4)3PO4 with 300.0 mL of 2.0 M Na2SO4? numbers next to compounds are subscripts
Saturday, March 28, 2015 at 1:09am

chemistry
Calculate the pH of a buffer which contains 0.0500 M pyruvic acid and 0.0450 M sodium pyruvate. (The Ka of pyruvic acid is 4.1 × 10–3)
Friday, March 27, 2015 at 11:36pm

Chemistry 1002
Calculate the standard entropy change for the following reaction at 25 °C. 2 Al (s) + 3 ZnO (s) --> Al2O3 (s) + Zn (s) answer is in J/K mol
Friday, March 27, 2015 at 11:08pm

chemistry
a solution contains 0.216 moles of a base and 0.614 moles of the conjuagte acid in a total volume of 800 mL. The pH of the solution 9.65. what is the value for kb of the base? the answer is 1.27E-4 how do you do it? do you need to convert from moles to molarity idek.
Friday, March 27, 2015 at 6:45pm

chemistry
25 mL 0.4 M KOH will neutralize 10 mL 1.0 M H2SO4 solution. A) True B) False
Friday, March 27, 2015 at 6:27pm

Chemistry
You need to prepare 100.0 mL of a pH=4.00 buffer solution using 0.100 M benzoic acid (pKa = 4.20) and 0.220 M sodium benzoate. How much of each solution should be mixed to prepare this buffer? mL of benzoic acid ? mL of sodium benzoate?
Friday, March 27, 2015 at 4:31pm

Chemistry
A buret is partially filled with NaOH solution, to a volume of 1.14mL. A 20-mL sample of 0.1011 M HCl is titrated to a faint pink phenolphthalein endpoint. The final buret buret reading is 22.37mL. What is the molarity of the NaOH solution? Please help. Thank you in advance.
Friday, March 27, 2015 at 4:20pm

Chemistry
Tetraphosphorus (P4), commonly known as white phosphorus, forms different compounds with chlorine (Cl2) depending on the amount of chlorine present. If chlorine is limited, phosphorus trichloride (PCl3) is formed. If there is an excess of chlorine, phosphorus pentachloride (...
Friday, March 27, 2015 at 4:11pm

Chemistry
C2H5OH(l) + 3 O2(g) -> 2 CO2(g) + 3 H2O(g) During an experiment 10.00 g of ethanol is completely burned in air to release CO2(g) and H2O(g) as shown in the equation above. During the combustion, 296.6 kJ of heat energy is released. What is the molar enthalpy of combustion...
Friday, March 27, 2015 at 3:24pm

Chemistry
A woman expends 96 kJ of energy in walking a kilometer. The energy is supplied by the metabolic breakdown of food intake and has a 35 % efficiency. If the woman drives a car over the same distance, how much energy is used if the car gets 8.7 km per liter of gasoline? The ...
Friday, March 27, 2015 at 11:20am

chemistry
It is found that an average volume of 24.25 ml of approximately 0.1 M NaOH is required to reach an endpoint in a titration with 25.00ml of 0.09917 M HCl solution. What is the NaOH concentration? Make sure to give answer to four significant figures.
Friday, March 27, 2015 at 11:12am

chemistry
who created the mcilvaine buffer system?
Friday, March 27, 2015 at 11:00am

Chemistry
The thermochemical equation which is associated with ∆H°f, the standard enthalpy of formation, for urea, CO(NH2)2 (s), is: CO (g) + 2NH3 (g) --> CO(NH2)2 (s) + H2 (g) CO (g) + 2H2 (g) + N2 (g) --> CO(NH2)2 (s) C (s) + O (g) + N2 (g) + 2H2 (g) --> CO(NH2)2 (s...
Friday, March 27, 2015 at 7:38am

Chemistry help
How many electrons are in p orbitals in an atom of oxygen? I answered 8 and 6 but it's wrong. Can anyone pls help.
Friday, March 27, 2015 at 5:27am

CHEMISTRY
What weight of NH4Cl(s) is produced by the reaction of 17.0 g of NH3(g)with 60.0 g of HCl(g). A.34.0g B53.5g, C60.0g, D94.0g add explanation thanks!
Thursday, March 26, 2015 at 10:57pm

CHEMISTRY
What weight of O is produced when 3.00 g of KClO3 (s) is decomposed according to the reaction 2KClO3(s) 2KCl(s)+ 3O2(g)? A. 0.392g B. 0.587g C. 0.783g D. 1.17g add a quick explanation, thnx
Thursday, March 26, 2015 at 10:06pm

chemistry
Calculate the pH at the stoichiometric point of a titration of 25.0 mL of 0.120 M benzoic acid with 0.0230 M NaOH
Thursday, March 26, 2015 at 9:58pm

chemistry
18. Calculate ƒ´H for the following reaction using Hess law H2 (g) + Br2 (g) ¡÷ 2 HBr (g) Experimental information 2 H+ ¡÷ H2 ƒ´H -436.4 kJ 2 Br- ¡÷ Br2 ƒ´H -192.5 kJ 2 H+ + 2 Br- ¡÷2 HBr &#...
Thursday, March 26, 2015 at 9:43pm

chemistry
17. Calculate ƒ´H of strontium carbonate using Hess law Sr + C (graphite) + 3/2 O2 ¡÷ SrCO3 Experimental information SrO ¡÷ Sr + 1/2 O2 ƒ´H 592 kJ SrO + CO2 ¡÷ SrCO3 ƒ´H -234 kJ 2 C (graphite) + 2 O2 &...
Thursday, March 26, 2015 at 9:42pm

chemistry
16. From the standard enthalpies of formation, calculate the ƒ´Horxn for the reaction: (ƒ´Hof = -151.9 kJ/mol for C6H12.) C6H12(l) + 9 O2(g) „³ 6 CO2 (g) + 6 H2O(l)
Thursday, March 26, 2015 at 9:41pm

chemistry
15. How much heat energy (in kJ) is evolved by a reaction in a bomb calorimeter in which the temperature of the bomb and water increased from 19.5 to 22.83 ºC? The bomb has a heat capacity of 650 J/C; the calorimeter contains 320 g of water.
Thursday, March 26, 2015 at 9:41pm

chemistry
14. Calculate the amount of heat liberated (in kJ) from 350 g mercury when it cools from 77.0 oC to 12oC. (The specific heat of mercury is 0.139 J/g oC)
Thursday, March 26, 2015 at 9:39pm

chemistry
What is the theoretical yield of H[2]O (in grams) if 8.3 mol H[2]S were consumed in the above reaction? If 137.1g of water was actually collected after the reaction, what is the percent yield? I have no idea to do this problem. I am not good in math at all and currently taking...
Thursday, March 26, 2015 at 9:03pm

chemistry
11. Calculate the total pressure of a mixture of 0.02 mol He and 0.01 mol H2 in a 5.0 L flask at 10 ºC.
Thursday, March 26, 2015 at 7:59pm

Chemistry
I need help with how to do this! -If a 7.0mL sample of vinegar was titrated to the stoichiometric equivalence point with 7.5mL of 1.5M NaOH, what is the mass percent of CH3COOH in the vinegar sample?
Thursday, March 26, 2015 at 3:24pm

chemistry
A mixture og gases has a total pressure off 28.3 atm, it is made of: 5.8 atm of hydrogen gas, 7.2 atm of nitrogen gas, 3.5 atm of oxygen gas and some amount of methane. What is the pressure of methane? what is the pressure of methane in kPa?
Thursday, March 26, 2015 at 11:12am

Chemistry
A 101 mL flask contains argon at 1.4 atm and 85◦C. What amount of Ar is present? Answer in units of mol.
Thursday, March 26, 2015 at 10:45am

chemistry
If you used different branded of tea beg what is the expected % of coffeine you will isolated. Why?
Thursday, March 26, 2015 at 10:30am

Chemistry
2zN reacts with O2 to produce 2ZnO, HOW MANY GRAMS OF ZINC OXIDE CAN BE PRODUCED FROM 2.75 G OF OXYGEN?
Thursday, March 26, 2015 at 8:34am

please help Chemistry
Zn(OH)2 was saturated in a solution of sodium hydroxide. The following equilibra exist under these conditions Zn(OH)2 -> Zn2+ +2OH- Ksp Zn2+ +OH- -> Zn(OH)+ K1 Zn(OH)- + OH- -> Zn(OH)2 K2 Zn(OH)2 + OH- -> Zn(OH)3- K3 Zn(OH)3- +OH- -> Zn(OH)42- K4 a) Sum of which...
Thursday, March 26, 2015 at 8:26am

Chemistry
How many kg of Glaubers salt (Na2SO4. 10 H2O) will be obtained from 250 kg of Na2SO4
Thursday, March 26, 2015 at 7:59am

chemistry
value and formula Ksp Of : -PbI2 -CdS -Ca(OH)2 -Ag2CrO4 -Cu2S
Thursday, March 26, 2015 at 7:37am

practical chemistry
perform a qualitative analysis test on ZnSO4 showing ur observations and inference
Thursday, March 26, 2015 at 7:17am

Chemistry
8. A chemist vaporized a liquid compound and determined its density. If the density of the vapor at 90 ºC and 753 mmHg is 1.585 g/L, what is the molecular weight of the compound?
Thursday, March 26, 2015 at 7:01am

chemistry
7. Calculate the density of hydrogen sulfide, H2S, at 56 ºC and 967 mmHg. (Express density in g/L)
Thursday, March 26, 2015 at 6:25am

chemistry
Zn(OH)2 was saturated in a solution of sodium hydroxide. The following equilibra exist under these conditions Zn(OH)2 -> Zn2+ +2OH- Ksp Zn2+ +OH- -> Zn(OH)+ K1 Zn(OH)- + OH- -> Zn(OH)2 K2 Zn(OH)2 + OH- -> Zn(OH)3- K3 Zn(OH)3- +OH- -> Zn(OH)42- K4 a) Sum of which...
Thursday, March 26, 2015 at 6:24am

AP Chemistry
A buffered solution was created by mixing solutions of NH4Cl and NH3 at 25 C. Which species, NH4+ or NH3, has the highest concentration in this buffered solution?. Justify your answer.
Thursday, March 26, 2015 at 12:55am

Chemistry
Tungsten trioxide (WO3) has a rich yellow color and is often used as a pigment in ceramics and paints. In order to test a ceramic vase for its WO3 content, a 10.20 g sample of the vase was ground and reduced with Pb(Hg) to convert any WO3 to W3 . The resulting W3 was ...
Wednesday, March 25, 2015 at 11:52pm

Chemistry
A 15.0 mL sample of whiskey was diluted to 500.0 mL. A 3.00 mL aliquot of the diluted sample was removed and the ethanol, C2H5OH, was distilled into 50.00 mL of 0.02400 M K2Cr2O7 and oxidized to acetic acid. The excess Cr2O72– was then back titrated with 19.0 mL of 0.1255...
Wednesday, March 25, 2015 at 11:51pm

chemistry
Using each of the following equations, calculate the number total of moles of products that can be obtained through decomposition of 1.75 moles of the reactant? a. 2 NH4NO3---> 2 N2 + O2 + 4 H2O b. 2 NaClO3---> 2 NACl + 3 O2 answers are 6.12 and 4.38 but i don't ...
Wednesday, March 25, 2015 at 11:02pm

Chemistry
A party-supply store sells a helium-gas cylinder with a volume of 1.55 × 10^-2 m^3. If the cylinder provides 1.81 m^3 of helium for balloon inflation (at STP), what must be the pressure inside the cylinder? Now I don't understand this at all. My book does not explain...
Wednesday, March 25, 2015 at 10:36pm

chemistry
7.5 gm of chromium and 7.5 grams oxygen yield
Wednesday, March 25, 2015 at 8:53pm

college chemistry
calculate the solubility of SrF2 (ksp=7.9E-10) in 0.100 M Sr(NO3)2 ? The answer is 4.44E-5 M how do you get that? I Have no clue I saw the setup but it doesnt get 4.44E-5 M
Wednesday, March 25, 2015 at 8:45pm

chemistry
50.0 mL of an unknown HCl solution was titrated with 0.449 M NaOH. To reach the equivalence point, 38.4 mL of the NaOH was used. What was the concentration of the HCl?
Wednesday, March 25, 2015 at 8:30pm

chemistry
An equilibrium mixture of N2, H2, and NH3 at 700 K contains 0.031 M N2 and 0.52 M H2. At this temperature, Kc for the reaction is 0.29. What is the concentration of NH3? N2(g) + 3H2(g) (equilibrium arrow) 2NH3(g)
Wednesday, March 25, 2015 at 8:30pm

chemistry
calculate the solubility of SrF2 (ksp=7.9E-10) in 0.100 M Sr(NO3)2 ? The answer is 4.44E-5 M how do you get that? I Have no clue?
Wednesday, March 25, 2015 at 7:57pm

Chemistry CP
Water has a much higher specific heat capacity than most liquids. Explain in terms of the attractive forces between water molecules.
Wednesday, March 25, 2015 at 5:32pm

chemistry cp
rank the following compiunds in order of increasing boiling points. a. CO b. C2H6 c. NH3
Wednesday, March 25, 2015 at 5:06pm

chemistry
which of the following molecules will exhibit hydrogen bonding? a. CH3OCH3 b. HF c. CH4 d. LiH
Wednesday, March 25, 2015 at 4:49pm

Chemistry
1. What would be the effect on the reaction rate if the [O2] were doubled? 2. What would be the effect on the reaction rate if the pressure on the reaction were doubled? 3. Assume the reaction is reversible and at equilibrium. What shifts in the equilibrium of this reaction ...
Wednesday, March 25, 2015 at 3:54pm

chemistry
200 ml of h2o is added to 400ml (m/10) of hcl solution. Find the pH of final solution?
Wednesday, March 25, 2015 at 12:17pm

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