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April 19, 2015

Homework Help: Science: Chemistry

Recent Homework Questions About Chemistry

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
calculate the ph at the equivalence point for the titration of .10 M NH3 with 0.10 m HCl kb= NH3 1.8E-5 idek how to do it?
Saturday, March 28, 2015 at 2:42pm

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

Chemistry
If I have pH of lemon juice that is 2.3 after I dilute it with 9 cups of water, what is the pH and how do I figure it out?
Wednesday, March 25, 2015 at 10:24am

chemistry
Calculate the volume occupied by 3moles of a gas at r.t.p
Wednesday, March 25, 2015 at 9:19am

chemistry
If 0.50 moles of NaOH were added to reach the equivalence point in a titration how many miles of tartaric acid reacted?
Wednesday, March 25, 2015 at 4:00am

Chemistry
A phosphate buffer solution contain 0.08 M K2HPO4 and 0.12 M KH2PO4. pKa values for H3PO4 are 2, 6.8, and 12.2. Calculate the concentrations of a) H3PO4 b) H2PO4- c) HPO42- d) H+ e) OH- f) K+
Wednesday, March 25, 2015 at 3:03am

chemistry
A spark plug fires before the gases in a cylinder are fully compressed. How will the engine be affected? A. The engine will get better gas mileage as less fuel is burned during each cycle. B. There will be fewer pollutants as the fuel has more time to burn. C. The gases will ...
Wednesday, March 25, 2015 at 1:15am

chemistry
If it takes 30 seconds for a reactant concentration to decrease from 1.0 M to 0.5 M in a first-order chemical reaction, then what is the rate constant for the reaction? A. 43 s–1 B. 0.046 s–1 C. 0.023 s–1 D. 0.033 s–1
Wednesday, March 25, 2015 at 1:14am

chemistry
How can the overall order of a reaction be determined? A. Add the exponents in an equilibrium constant expression. B. Add the coefficients in the balanced equation. C. Count the number of different reactants. D. Examine experimental data for the reaction over time.
Wednesday, March 25, 2015 at 1:13am

Chemistry
A student tested the effect of temperature on the decomposition of N2O5. He found that the rate of the reaction at a lower temperature was 4.2 x 10–3 s–1 and the rate at a higher temperature was 1.6 x 101 s–1. What is wrong with the student's data? A. ...
Wednesday, March 25, 2015 at 12:55am

chemistry
Trying to calculate atoms of O in 2.00 moles of H3PO4.I used 2.00 mol h3po4÷4atoms O then × by 6.022 avrogados# My answer 3.011×10^23
Wednesday, March 25, 2015 at 12:36am

Chemistry
1) How would you expect the solubility of the following to vary n a series of solutions of increasing ionic strength created by adding KNO3 a) ammonia b) ammonium chloride 2) If the ionic strength was increased by adding KCl, the solubility of which one of the above two ...
Wednesday, March 25, 2015 at 12:32am

chemistry
A particular weak acid (HA) with a Ka of 2.0e-5 is 75% titrated with a strong base to produce a buffer solution. What is the pH of this final solution? Show all work.
Tuesday, March 24, 2015 at 11:25pm

Chemistry
Refer to the table given for the ionic radii in your lab manual and approximate the attractive portion of the lattice energy for 1 mole of the following salts. (Consider only one bond if more than one bond exists.) a) PbS2 b) Ca3P2 c)Ca3N2
Tuesday, March 24, 2015 at 11:13pm

Chemistry
A voltaic cell operates with 0.40 M Zn 2+ at the solid zinc anode and 1.45 M Zn2+ at the solid zinc cathode at 25 C. Is the reaction thermodynamically favored?
Tuesday, March 24, 2015 at 11:12pm

chemistry
A spark plug fires before the gases in a cylinder are fully compressed. How will the engine be affected? A. The engine will get better gas mileage as less fuel is burned during each cycle. B. There will be fewer pollutants as the fuel has more time to burn. C. The gases will ...
Tuesday, March 24, 2015 at 10:30pm

chemistry
What volume of nitrogen gas at STP can form from 1.20 mol NaN3? 2NaN3(s) 2Na(s) + 3N2(g) A. 40.3 L B. 1.20 L C. 13.4 L D. 1.80 L
Tuesday, March 24, 2015 at 10:29pm

chemistry
Refer to the table given for the ionic radii in your lab manual and approximate the attractive portion of the lattice energy for 1 mole of the following salts. (Consider only one bond if more than one bond exists.) (a) SrO
Tuesday, March 24, 2015 at 10:09pm

Chemistry
What volume of carbon dioxide is produced when 7.5g of butane react with 19g of oxygen gas at 74 degrees celsius at 550 torr?
Tuesday, March 24, 2015 at 10:07pm

Chemistry
How many moles of gas will occupy 6.75 m3 at 65.0°C and 3.28 x 105 Pa? A. 7.98 x 104 mol B. 4.10 x 103 mol C. 7.88 x 102 mol D. 4.15 x 105 mol
Tuesday, March 24, 2015 at 9:48pm

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...
Tuesday, March 24, 2015 at 9:40pm

Chemistry
There is a picture of a brick lying face down and one standing straight up. The question asks: Is each brick exerting the same force? Explain. I know that they are exerting the same force, but I don't understand why and how to explain it?
Tuesday, March 24, 2015 at 8:32pm

Chemistry
Step 1: A 12.70mL sample of cyanide solution was mixed with 25.00mL of a solution of nickel ions at an appropriate pH to form the Ni-cyanide complex. The resulting solution was titrated cs 0.0130M EDTA and required 10.10mL to reach the end point. Step 2: Then 30.00mL of the ...
Tuesday, March 24, 2015 at 8:12pm

Analytical Chemistry
For a triprotic acid H2PO4. Ka1=7.11e-3, Ka2=6.32e-8 and Ka3=7.1e-13. 50mL each of 0.05F CaCl2 and 0.05F phosphoric acid were mixed. Ksp CaHPO4=2.6e-7. a) Would CaHPO4 precipitate when phosphoric acid and calcium chloride were mixed together? b) List all species (ions, ...
Tuesday, March 24, 2015 at 7:52pm

Cultural Anthropology
DESCRIBE 2 REASONS WITH EXAMPLES WHY IT IS IMPORTANT TO HAVE A STRICT CODE OF ETHICS IN ANTHROPOLOGY AND OTHER SOCIAL SCIENCES COMPARED TO MORE SCIENTIFIC DISCLIPLINES SUCH AS CHEMISTRY OR PHYSICS My textbook is Cultural anthroplogy by barbra miller and i can't find ...
Tuesday, March 24, 2015 at 5:55pm

chemistry
One gram of pbcl2 is dissolved in 1.0 l of hot water. When the solution is cooled to 25degrees Celsius, will some of the pbcl2 crystallize out? If so, how much? I just don't know where to start/ where to go with this problem Any help is appreciated!!
Tuesday, March 24, 2015 at 5:41pm

Chemistry
The amino acid glycine, C2H5NO2, is one of the compounds used by the body to make proteins. The equation for its combustion is 4C2H4NO2(s)+9O2(g)---> 8CO2(g)+10H2O(l)+2N2(g) For each mole of glycine that burns, 973.49 kJ of heat is liberated. Use this information, plus ...
Tuesday, March 24, 2015 at 5:37pm

chemistry
A spark plug fires before the gases in a cylinder are fully compressed. How will the engine be affected? A. The engine will get better gas mileage as less fuel is burned during each cycle. B. There will be fewer pollutants as the fuel has more time to burn. C. The gases will ...
Tuesday, March 24, 2015 at 4:31pm

Chemistry
In the recovery of iron from iron ore, the reduction of the ore is actually accomplished by reactions involving carbon monoxide. Use the following thermochemical equations, Fe2O2(s) + 3CO(g) ---> 2Fe(s) +3CO2(g) ΔH° = -28kJ 3Fe2O2(s) + CO(g) ---> 2Fe3O4(s)+ CO2(...
Tuesday, March 24, 2015 at 4:30pm

chemistry
The molecules of which gas have the greatest velocity at 120°C? A. O2 B. CO2 C. NH3 D. Cl2
Tuesday, March 24, 2015 at 4:08pm

chemistry
Which of the following is not a physical property of gases? A. Low density B. No thermal expansion C. No fixed shape D. Compressibility I believe the answer is B
Tuesday, March 24, 2015 at 3:57pm

Chemistry
Sulfuric acid can dissolve 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 24.4g . What minimum amount of H2SO4 in grams would you need?
Tuesday, March 24, 2015 at 3:39pm

Chemistry
Methane burns with oxygen to produce carbon dioxide and water as a gas. The balanced thermochemical equation is Ch4(g) + 2)2(g) ---> CO2(g) + 2H2O(g) H = -802kJ How much methane, in grams, must be burned to release 544 kJ of heat? My answer: 544/802 = 0.678 0.678*16= 10....
Tuesday, March 24, 2015 at 3:10pm

chemistry
how much ml of concentrated hci required to make 0.5N hcl solution? /
Tuesday, March 24, 2015 at 12:43pm

college chemistry
solid diarsenic trioxide reacts with Flourine gas to produce liquid arsenic pentaflouride and oxygen gas. Write the Qc for this reaction
Tuesday, March 24, 2015 at 12:06pm

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