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September 16, 2014

Homework Help: Science: Chemistry

Recent Homework Questions About Chemistry

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college chemistry
kilocalories released when 20.0 g of steam condenses at 100 degrees C. and the liquid cools to 0 degrees C.
Friday, February 7, 2014 at 2:26pm

Chemistry
Rank Cd, Br, and Si from worst to best conductor of electricity. Is it Br, Cd, Si? Thanks -MC
Friday, February 7, 2014 at 12:33pm

chemistry
2)Tf = (0.00089 +/- 0.00008) * (13 +/- 2) + (19.627 +/- 0.004) Tf = (0.012 +/- 0.002) + (19.627 +/- 0.004) Tf = 19.639 +/- what value?
Friday, February 7, 2014 at 9:46am

chemistry
Divers know that the pressure exerted buy the water increases about 100kpa with every 10.2 m of depth. This means that at 10.2 m below the surface, the pressure is 201 kpa; at 20.4 m , the pressure is 301 Kpa; and so forth. Given that the volume of a balloon is 3.5L at STP and...
Friday, February 7, 2014 at 8:55am

Chemistry
It says 8. In a similar experiment Mary Moreorlesss was to determine the loss of weight when a crucible of potassium chlorate was heated to drive off the oxygen. After finishing the experiment she concluded the potassium chlorate contained 24.0% oxygen. Why did miraculous(...
Thursday, February 6, 2014 at 10:25pm

Chemistry
I'm doing something wrong with osmolarity. I have 100 ml of .9% NaCl. So what i did was take the MW (58.44) and divided it by the .9 because it should be grams, then divided that number by .1 (for the liters) but its coming out with a huge number and its not supposed to. I...
Thursday, February 6, 2014 at 9:23pm

Chemistry
Calculate the amount of energy in calories that is needed to melt 45g of ice at -20°C and then increase the temperature to 95°C
Thursday, February 6, 2014 at 8:43pm

Chemistry
how many grams of potassium iodide can be produced by the reaction of 150 grams of iodide and 45.6 grams of potassium?
Thursday, February 6, 2014 at 8:19pm

Chemistry
A 0.960mol quantity of Br2 is added to a 1.00 L reaction vessel that contains 1.23mol of H2 gas at 1000 K. What are the partial pressures of H2, Br2, and HBr at equilibrium? At 1000 K, Kp=2.1×106 and ΔH∘ = -101.7 kJ for the reaction H2(g)+Br2(g)⇌2HBr(g...
Thursday, February 6, 2014 at 8:03pm

CHEMISTRY
A 85.2-mg sample of the compound X4O10 contains 48.0 mg of oxygen atoms. What is the atomic mass of element X?
Thursday, February 6, 2014 at 6:10pm

Chemistry
A 85.2-mg sample of the compound X4O10 contains 48.0 mg of oxygen atoms. What is the atomic mass of element X?
Thursday, February 6, 2014 at 5:37pm

Chemistry
Use the periodic table and predict the number of electrons that will be lost or gained by the following elements as they change into simple ions. Write an equation using elemental symbols, ionic symbols, and electrons to represent each change. a) Ca b) Aluminum c) Fluorine d) ...
Thursday, February 6, 2014 at 4:10pm

chemistry
Calculate the pH for each of the following cases in the titration of 25.0 mL of 0.180 M pyridine, C5H5N(aq) with 0.180 M HBr(aq): 1)before addition of any HBr 2)after addition of 12.5 ml of HBr: 3)after addition of 16 ml of HBr: 4)after addition of 25 ml of HBr: 5)after ...
Thursday, February 6, 2014 at 11:05am

Chemistry
6 FeCl2(aq) + K2Cr2O7(aq) + 14 HCl(aq) ==> 6 FeCl3(aq) + 2 CrCl3(aq) + 2 KCl(aq) + 7 H2O(l) How many milliliters of 0.0750 M K2Cr2O7(aq) will react with 0.038 mol of FeCl2(aq)? I used the equation Molarity=Mole/Volume and divided my answer by 1000 to get milliliters. I'...
Thursday, February 6, 2014 at 10:32am

Chemistry
In a high temperature corrosion cell we have 5 vol% O2 and 500 vppm HCl. We know at high temperature the reaction is Deacon Process (600C) 4HCl(g)+O2(g)=2Cl2(g)+2H2O(g). We have thermodynamic phase diagram of a system (e.g., Fe-O2-Cl2) at 600 (log pO2 - x axis and log pCl2 in ...
Thursday, February 6, 2014 at 4:44am

chemistry
This equation decribes oxidation of acidified solution of sodium oxalate(Na2C2O4) by potassium permanganate(KMnO4): 5 C2O4^2- + 2Mn04^- + 16H2SO4 to produce 10Co2 + 2Mn^2- + 16HSO4^- + 8H2O. what volume of 0.127M sodium oxalate in sulphuric acid will react with 3.57g of ...
Thursday, February 6, 2014 at 1:00am

chemistry
1.64 L of a 4.95 M solution is diluted to form a 2.58 M solution. (Rounded to 3 sig figs) there are __________ L of the 2.58 M solution formed.
Wednesday, February 5, 2014 at 11:15pm

Chemistry
Calculate the number of grams of xenon in 3.566 g of the compound xenon tetrafluoride.
Wednesday, February 5, 2014 at 9:52pm

Chemistry
Calculate the formula mass for each of the following halogen compounds to five or more significant figures:? bake asked 5 months ago (a) NaIO3 (antiseptic) (b) CCl2F2 (former refrigerant)
Wednesday, February 5, 2014 at 9:37pm

Chemistry
Calculate the number of grams of xenon in 3.566 g of the compound xenon tetrafluoride.
Wednesday, February 5, 2014 at 9:35pm

General Chemistry
How do the vapour pressure of two substance at the same temperature but with different strengths of the inter-molecular forces compare. Give a molecular explanation of why this is so.
Wednesday, February 5, 2014 at 9:15pm

chemistry
convert the value of the vapour pressure (149.4 torr) at 60 degree celsius to atm
Wednesday, February 5, 2014 at 8:46pm

Chemistry
Answer the following questions about the characteristics of the elements in Group 2 (the alkaline earths). How do they react with iodine? How do they react with water? How do they react with oxygen? Which reacts the most vigorously? Which element in the group is the most ...
Wednesday, February 5, 2014 at 8:27pm

Chemistry
Answer the following questions about the characteristics of the elements in Group 2 (the alkaline earths). How do they react with iodine? How do they react with water? How do they react with oxygen? Which reacts the most vigorously? Which element in the group is the most ...
Wednesday, February 5, 2014 at 8:26pm

Chemistry
complete the equation. Na + H2-->
Wednesday, February 5, 2014 at 8:06pm

Chemistry
complete the equation. Na + H2-->
Wednesday, February 5, 2014 at 7:52pm

Chemistry
Suppose a student titrates a 10.00-mL aliquot of saturated Ca(OH)2 solution to the equivalence point with 13.65 mL of 0.0234 M HCl. What was the initial [OH − ]? What is the experimental value of Ksp?
Wednesday, February 5, 2014 at 6:58pm

Ap Chemistry
Adding or taking away small amounts of water in a reaction that takes places in an aqueous solution ____________________ affect the overall concentration of water.
Wednesday, February 5, 2014 at 5:44pm

chemistry
a .50 sample if vegetable oil is placed in a calorimeter. When the sample is burned, 18.9 kJ are given off. what id the caloric value, in kcal/g
Wednesday, February 5, 2014 at 5:31pm

AP Chemistry
what is the pKa of an acid that has a pH of 7.4 at neutralization and has to have 25 mL added to neutralize it
Wednesday, February 5, 2014 at 5:28pm

Chemistry AP
What are the concentrations of benzoic acid and sodium benzoate in a solution that is buffered with a pH of 4.55 and has a freezing point of -2.0 degrees Celsius? (assume complete dissociation and a density of 1.01g/mL for the solution.)
Wednesday, February 5, 2014 at 2:54pm

Chemistry
Balance equation. been working on this for almost 5 hours now, just cant do it. HCl+As2O3+NaNO3+H2O-->NO+H3AsO4+NaCl
Wednesday, February 5, 2014 at 1:47pm

Chemistry
The temperature of 550. g of water is increased from 16.0 degrees Celsius to 28.2 degrees Celsius by burning fuel. How many joules of energy is needed to increase the temperature of the water to 28.2 degrees?
Wednesday, February 5, 2014 at 12:46pm

chemistry
What is the percent recovery if you begin with 0.482 grams of copper and recover 0.325 g? Include one decimal place in the answer and do not include the % sign. Answer
Wednesday, February 5, 2014 at 12:30pm

Chemistry
Magnesium metal reacts with phosphoric acid to produce hydrogen gas. If 50 g of phosphoric acid is used, how much magnesium metal is needed? How much hydrogen gas is produced?
Wednesday, February 5, 2014 at 11:54am

Chemistry
Aspirin, C9H8O4 , is produced through the following reaction of salicylic acid, C7H6O3, and acetic anhydride, C4H6O3: C7H6O3(s) + C4H6O3(l) ---> C9H8O4(s) + HC2H3O2(l) A. What mass of aspirin (kg) could be produced from 75.0 mol of salicylic acid? B. What mass of acetic ...
Wednesday, February 5, 2014 at 10:39am

chemistry
6 part question 1. describe the appearance of a Bunsen flame that is getting insufficient air? 2. describe the appearance of a Bunsen flame that is getting too much air. 3. When inserting glass tubing into a rubber stopper, how far from the stopper should you hold the tubing? ...
Wednesday, February 5, 2014 at 8:13am

chemistry
The normal boiling point of Rh is 3727°C. What is its vapor pressure in mm Hg at 2914°C, if its heat of vaporization is 557.0 kJ/mol?
Wednesday, February 5, 2014 at 12:32am

chemistry
I did a lab the other day where we separated a mixture of NaCl, SiO2, and CaCO3. The Mixture was made by my professor and we did not know the original amounts of each compound. After recovering all of the compounds we found that there was.. 36.4% NaCl 36.4% SiO2 40.9% CaCO3 ...
Wednesday, February 5, 2014 at 12:15am

chemistry
I did a lab the other day where we separated a mixture of NaCl, SiO2, and CaCO3. The Mixture was made by my professor and we did not know the original amounts of each compound. After recovering all of the compounds we found that there was.. 36.4% NaCl 36.4% SiO2 40.9% CaCO3 ...
Wednesday, February 5, 2014 at 12:15am

chemistry
I did a lab the other day where we separated a mixture of NaCl, SiO2, and CaCO3. The Mixture was made by my professor and we did not know the original amounts of each compound. After recovering all of the compounds we found that there was.. 36.4% NaCl 36.4% SiO2 40.9% CaCO3 ...
Wednesday, February 5, 2014 at 12:15am

chemistry
I did a lab the other day where we separated a mixture of NaCl, SiO2, and CaCO3. The Mixture was made by my professor and we did not know the original amounts of each compound. After recovering all of the compounds we found that there was.. 36.4% NaCl 36.4% SiO2 40.9% CaCO3 ...
Wednesday, February 5, 2014 at 12:15am

chemistry
I did a lab the other day where we separated a mixture of NaCl, SiO2, and CaCO3. The Mixture was made by my professor and we did not know the original amounts of each compound. After recovering all of the compounds we found that there was.. 36.4% NaCl 36.4% SiO2 40.9% CaCO3 ...
Wednesday, February 5, 2014 at 12:15am

Chemistry
When 3.10 g of a nonelectrolyte solute is dissolved in water to make 755 mL of solution at 26 °C, the solution exerts an osmotic pressure of 821 torr. What is the molar concentration of the solution? How many moles of solute are in the solution? What is the molar mass of ...
Tuesday, February 4, 2014 at 11:17pm

Chemistry
I did a lab the other day where we separated a mixture of NaCl, SiO2, and CaCO3. The Mixture was made by my professor and we did not know the original amounts of each compound. After recovering all of the compounds we found that there was.. 36.4% NaCl 36.4% SiO2 40.9% CaCO3 ...
Tuesday, February 4, 2014 at 8:39pm

ap chemistry
What is the ratio of the molarities of PO3^4- and HPO4^2− ions in a buffer solution having a pH of 13.16? What mass of K3PO4 must be added to 1 L of 0.1 M K2HPO4(aq) to prepare a buffer solution with a pH of 13.16? Answer in units of g What mass of K2HPO4 must be added ...
Tuesday, February 4, 2014 at 7:18pm

ap chemistry
What is the pH at the equivalence point in the titration of 10.0 mL of 0.56 M HZ with 0.200 M NaOH? Ka = 6.6 × 10−5 for HZ.
Tuesday, February 4, 2014 at 7:16pm

ap chemistry
What is the pH at the point during a titration when 34 mL of 0.200 M HCl has been added to 29 mL of 0.0500 M NH3 solution? HCl is a strong acid, Kb=1.8×10−5 for NH3. Answer in units of pH
Tuesday, February 4, 2014 at 7:16pm

Chemistry
5. On the basis of a solubility curve for KNO3 what type of substance would you expect KNO3 to be? Choices: solid liquid gas It is impossible to tell. I don't want the answer. All I want to know is, can you tell whether something is a liquid/solid/gas just by using a ...
Tuesday, February 4, 2014 at 7:14pm

ap chemistry
Calculate the pH at the equivalence point for the titration of a solution containing 150.0 mg of ethylamine (C2H5NH2) with 0.1000 M HCl solution. The volume of the solution at the equivalence point is 250.0 mL. Kb for ethylamine is 4.7 × 10−4.
Tuesday, February 4, 2014 at 7:04pm

ap chemistry
Calculate the ratio of [NH3]/[NH4+] that gives a solution of pH = 10.60.
Tuesday, February 4, 2014 at 7:03pm

ap chemistry
How many moles of sodium acetate (NaCH3COO) must be added to 1.000 liter of a 0.500M solution of acetic acid (CH3COOH) to produce a pH of 5.027? The ionization constant of acetic acid is 1.8 × 10−5. Answer in units of mol
Tuesday, February 4, 2014 at 7:00pm

ap chemistry
The ionization constant of HF is 7.2 × 10−4. What is the molar concentration of H+ in a solution which is 0.353 molar in HF and 0.145 molar in KF?
Tuesday, February 4, 2014 at 6:59pm

chemistry
Two naturally occurring isotopes exist for the hypothetical element dippium. 25.0 percent of dippium atoms have a relative mass of 17.0 amu and 75.0 percent a relative mass of 21.3 amu. What is the atomic mass of dippium? Please show the work thanks
Tuesday, February 4, 2014 at 6:59pm

ap chemistry
What mass of solid sodium formate (of MW 68.01)must be added to 125 mL of 0.48 mol/L formic acid (HCOOH) to make a buffer solution having a pH of 4.07? Ka = 0.00018 for HCOOH. Answer in units of g
Tuesday, February 4, 2014 at 6:58pm

ap chemistry
What is the concentration of hydrogen ions in a solution containing 0.785 M HOCN (cyanic acid) and 0.659 M (NaOCN) (sodium cyanate)? The ionization constant of cyanic acid is 3.5 × 10−4. Answer in units of M
Tuesday, February 4, 2014 at 6:57pm

ap chemistry
What is the concentration of H+ ions in a buffer solution containing 0.305 M benzoic acid (with ionization constant 6.5 × 10−5)and 0.834 M sodium benzoate (a salt of benzoic acid)?
Tuesday, February 4, 2014 at 6:56pm

ap chemistry
A buffer solution is made by dissolving 0.45 moles of a weak acid (HA) and 0.23 moles of KOH into 680 mL of solution. What is the pH of this buffer? Ka = 2.4×10−6 for HA.
Tuesday, February 4, 2014 at 6:34pm

Chemistry
A solution is 3.00M NaCl. The solution density is 1.05 g/mL. Calculate the molality?
Tuesday, February 4, 2014 at 6:12pm

Chemistry
How many moles of dichloromethane (CH2Cl​2) would be produced if we doubled the amount of chlorine, but still had the same amount of ethene (C2H4) available in the reaction?
Tuesday, February 4, 2014 at 4:51pm

college chemistry
to calulate the calories(kcal) in 1/2 cup of soft ice cream that contains 16g carbs, 17g fat, 5g protein. do I multiply 16g x 4 for carbs 17g x 9 for fat 5g x 4 for proteins? then do I do conversion factors for grams to 1/2cup? am I on the right road?
Tuesday, February 4, 2014 at 3:46pm

college chemistry
Ifwater cools to body temp.37 degrees C., how many kilocalories of heat could be transferred to sore muscles?
Tuesday, February 4, 2014 at 2:16pm

chemistry
3 part question If an object is completely submerged in a liquid, what volume of liquid does the object displace? List the special waste disposal instruments that must be followed. List the special safety precautions that must be taken.
Tuesday, February 4, 2014 at 1:57pm

chemistry
3 part question List the three techniques that can minimize error in measuring temperatures. What should you do if you spill anything on or near the balance? Name a piece of laboratory equipment is specifically designed to measure volumes.
Tuesday, February 4, 2014 at 1:54pm

chemistry
if you are asked to "obtain about 3 g of sodium chloride weighed to the nearest 0.001 g should you weigh out exactly 3.000 g? explain your answer.
Tuesday, February 4, 2014 at 1:50pm

Chemistry II
what is the complete & balanced equation for the following reactions & include the catalysts if any: 1. Combustion of Methane: 2. Halogenation of Cyclopentene with Br2 4. Hydrogenation of 3-methyl-1-butyne 5. Combustion of 2-methylpropene 6. Hydrohalogenation reaction between ...
Tuesday, February 4, 2014 at 12:56pm

Chemistry
If 20mL of a 0.100 M NaOH solution are required to titrate 0.25 grams of an unknown acid, what is the equivalent mass of the acid? If the acid actually contains 3 moles of H+ per mole of acid what is the molecular mass of the acid?
Tuesday, February 4, 2014 at 12:00pm

Chemistry
What is the normal boiling point in ∘ C ^\circ {\rm C} of a solution prepared by dissolving 1.50 g {\rm g} of aspirin (acetylsalicylic acid, C 9 H 8 O 4 {\rm C}_{9}{\rm H}_{8}{\rm O}_{4}) in 75.00 g {\rm g} of chloroform (CHCl 3 ) ({\rm CHCl}_{3})? The normal boiling ...
Tuesday, February 4, 2014 at 11:07am

chemistry
a 2.50-mole quatity of NOCL was initially in a 1.50-L reaction chamber at 400 degrees celcius. after equilibrium was established, it was found that 28.0 percent of the NOCL had dissociated. 2NOCL(g) <---> 2NO(g)+ Cl2(g)
Tuesday, February 4, 2014 at 10:43am

chemistry
6Na+Fe2O3=3Na2O+2Fe if Interact 100g of Na with 100g of Fe2O3,Calculate: - The resulting mass of iron?
Tuesday, February 4, 2014 at 10:05am

Chemistry
How many grams of sucrose (molecular weight = 342.3 g/mol) would you dissolve in 350 ml to get a 7% solution?
Tuesday, February 4, 2014 at 7:51am

Chemistry
Sodium sulfate is slowly added to a solution containing 0.0500 M Ca2 (aq) and 0.0370 M Ag (aq). What will be the concentration of Ca2 (aq) when Ag2SO4(s) begins to precipitate?
Tuesday, February 4, 2014 at 12:13am

Chemistry
A 0.960mol quantity of Br2 is added to a 1.00 L reaction vessel that contains 1.23mol of H2 gas at 1000 K. What are the partial pressures of H2, Br2, and HBr at equilibrium? At 1000 K, Kp=2.1×106 and ΔH∘ = -101.7 kJ for the reaction H2(g)+Br2(g)⇌2HBr(g).
Monday, February 3, 2014 at 9:58pm

chemistry
What physical properties of calcium chloride, citric acid, sodium iodide, potassium iodide, and sucrose have in common?
Monday, February 3, 2014 at 8:41pm

chemistry
how many calories are needed to convert 20.0g of water at 25 Celsius to steam at 100 Celsius?
Monday, February 3, 2014 at 5:42pm

chemistry
how can we separate MnCl2(aq)+Na2SO4(aq)?
Monday, February 3, 2014 at 3:27pm

chemistry
A 0.25 kg length of aluminum wire is warmed 10.0°C by an electric current. How much heat was generated by the current?
Monday, February 3, 2014 at 3:16pm

Chemistry
Henry constant for the dissolving of nitrogen in water was reported as 7e-4 mol/Latm at 20 deg Celsius. What is the value of the equilibrium constant, K, at 20 deg Celsius for the process N2(g0)=N2(aq). If the amount of nitrogen in aqueous solution is .1 mol N2 and the partial...
Monday, February 3, 2014 at 2:49pm

chemistry
2part question a camper obtained a sample of water from a mountain stream for cooking, but the water appeared to be cloudy with slit. what would be the best method of separating the silt from the water? Draw a flow chart for the separation you have described, using: mixture 10...
Monday, February 3, 2014 at 9:02am

chemistry
a student tried to separate a mixture of sand and red-colored water using a suction filtration apparatus. From a mixture of 10.0g of sand and 90.0g of water, the student recovered 9.5g of sand. what was the percent recovery of sand from the mixture? the sand, originally white...
Monday, February 3, 2014 at 8:57am

CHEMISTRY
HELP MY REPORT IS ABOUT SATURATED ND UNSATURATED SOLUTIONS
Monday, February 3, 2014 at 4:52am

Chemistry
What is the molal concentration of an aqueous calcium chloride solution that freezes at -2.43 degrees C?
Monday, February 3, 2014 at 12:29am

Chemistry II
What is the molal concentration of an aqueous calcium chloride solution that freezes at -2.43 degrees C?
Monday, February 3, 2014 at 12:06am

chemistry
Rhodium metal currently costs $1251. per troy ounce (note this is different than a regular ounce! 1 troy ounce = 31.1035g). What would the cost be in dollars to purchase enough gold to form a solid square based pyramid with base dimensions 0.750m by 0.750m and height of 0.500m?
Sunday, February 2, 2014 at 11:24pm

chemistry
A sample of aluminum metal containing 9.1080 x 10 to the 25 power atoms is drawn into a cylindrical wire with radius r=0.833 mm. how long must the wire be in meters?
Sunday, February 2, 2014 at 11:01pm

chemistry
the suction filtration flask has been taped with strong black tape. Why was this safety precaution a good idea?
Sunday, February 2, 2014 at 10:01pm

chemistry
A camper obtained a sample of water from a mountain stream for cooking, but the water appeared to be cloudy with silt. What would be the best method of separating the silt from the water?
Sunday, February 2, 2014 at 9:59pm

chemistry
the sand originally white, was a light pink after drying. How could the student improve the color of sand further?
Sunday, February 2, 2014 at 9:57pm

Chemistry
a student used a piece of copper with a mass of 2.85g and obtained 2.95g of copper at the end of the experiment, an apparent recovery of 104$. How could the student account for this result, since the best to expect is 100%.
Sunday, February 2, 2014 at 9:56pm

chemistry
I have to prepare a 0.2% water solution of n-propanol and a water solution of methanol and isopropanol at 0.2% that can be in the same container. It didn't specify but I'm pretty sure the solutions are v/v%. For the n-propanol a 0.2% solution should just be 2mg/mL of ...
Sunday, February 2, 2014 at 9:28pm

Chemistry
Draw the Lewis Structures of the following compounds: CH3CH3CH3COH, H2NCOCH3, HCCCH2OH.
Sunday, February 2, 2014 at 9:26pm

Chemistry Lab
So I did a kinetics lab on the rate of reaction of peroxydisulfate ion with iodide ion. Part 1 was the effect of concentration. One of the questions asked is to calculate the amount of thiosulfate consumed in moles. My results for trial 1 were (Times taken for consumption of 1...
Sunday, February 2, 2014 at 9:25pm

Analytical chemistry
How many grams of solid CuSO4. 5H2O are needed to prepare a 500 ml of a 1000 ppm solution of Cu?
Sunday, February 2, 2014 at 8:18pm

Chemistry
About 50% of U.S. and most Canadian sulfur is produced by the Claus process, in which sulfur is obtained from the H2S(g) that occurs in natural gas deposits or is produced when sulfur is removed from petroleum. The reactions are described by the equations 1)2H2S(g)+3O2(g)=2OS2...
Sunday, February 2, 2014 at 7:45pm

Chemistry
If you total sample mass was 1.50 g, and you determined that 0.95 g were KHCO3, what was the percent mass off the KHCO3 in the sample?
Sunday, February 2, 2014 at 7:40pm

Science (Chemistry)
A student mixes 35.0 mL of 2.82 M Pb(NO3)2(aq) with 20.0 mL of 0.00221 M Na2C2O4(aq). How many moles of PbC2O4(s) precipitate from the resulting solution? What are the values of [Pb2 ], [C2O42–], [NO3–], and [Na ] after the solution has reached equilibrium at 25 °...
Sunday, February 2, 2014 at 7:16pm

Science (Chemistry)
A student mixes 35.0 mL of 2.82 M Pb(NO3)2(aq) with 20.0 mL of 0.00221 M Na2C2O4(aq). How many moles of PbC2O4(s) precipitate from the resulting solution? What are the values of [Pb2 ], [C2O42–], [NO3–], and [Na ] after the solution has reached equilibrium at 25 °...
Sunday, February 2, 2014 at 7:16pm

Chemistry
In a similar experiment, a student needs a 0.50 M KOH solution (MM = 56.11 g/mol). The student only has a 50.00 mL volumetric flask. How much KOH should be added before the flask is filled with water?
Sunday, February 2, 2014 at 7:13pm

Chemistry
20.00 ml of 20.00 M acetic acid is reacted with .1000M NaOh calculate the number of millimoles of acetic acid reacted
Sunday, February 2, 2014 at 6:08pm

Chemistry
N2(g) + O2(g) → N2O5(g) What volume of oxygen gas reacts to yield 750.0 cm3 of N2O5? The reaction conditions are 350°C and 2.50 atm pressure. 2N2 + 5 O2 = 2N2O5 I balanced correctly. What is my next step to solve this problem. I am confused and I want to understand ...
Sunday, February 2, 2014 at 5:06pm

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