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May 30, 2015

Homework Help: Science: Chemistry

Recent Homework Questions About Chemistry

smhs chemistry
explaine whay vacuole in the plant cell is larger than the animal cell?
Monday, January 26, 2015 at 5:46pm

Chemistry
A student is instructed to standardize an approximately 2.5N KOH solution using a 0.500N H2SO4 stock solution. Describe the experimental procedure he/she must follow. I do not understand what procedure needs to be followed.
Monday, January 26, 2015 at 5:18pm

Chemistry
how much heat is required to warm a 215 g cup of water from 21 degree Celsius to 85 degree Celsius? Not sure what the formula is or how to set this up. I know the specific heat formula is heat/mass x change in temperature. Not sure if this applies to the question. Please help...
Monday, January 26, 2015 at 3:44pm

Chemistry
Daily diet consists of 120 g of carbohydrates, 65 g of fat, and 43 g of protein. How many calories does this diet provide daily? My work/answers: 120 g x 4 g/calories of carbs = 48 g/cal 65 g x 9 g/calories of fats= 585 g/cal 43 g x 4 g/calories of protiens = 172 g/cal Total: ...
Monday, January 26, 2015 at 3:42pm

Chemistry
Person consumes 1995 Calories/day. How many is this in kJ My answer/work: 1995 x 1000 cal/1 Cal x 4.184J/1 cal x 1 kj/1000J= 8347.08kj Let me know if I did anything wrong and give me a hint on what I can do to fix it thank you :)
Monday, January 26, 2015 at 3:40pm

Chemistry
Calculate the following temperatures 1. Its 18 F. What is this in C? 2. Calculate this temperature (from question #1) to K 3. Convert 38.2 C to F My answers 1. -7.7 C 2. 265.3 K 3. 100.76 F Let me know what I did wrong if I'm incorrect thank you :)
Monday, January 26, 2015 at 3:38pm

english
School has increased in its difficulty over the years. In the past, kindergarten was carefree; all I had to do was finger paint, crafts, and daily nap-times, which gave me the rest I needed. During my elementary years, math went from adding and subtracting to multiplication ...
Monday, January 26, 2015 at 11:15am

chemistry
You wish to prepare 100.0 mL of a 800.0 ppm w/v sodium (MW = 22.9897 g/mol) solution. How many grams of sodium dichromate dihydrate (Na2Cr2O7·2H2O, MW = 297.998 g/mol) are needed to prepare this solution?
Monday, January 26, 2015 at 1:31am

chemistry
A human body is 55% water. A person has a mass of 78 kg. How many kg. of water is in this person's body?
Sunday, January 25, 2015 at 9:18pm

Chemistry
I would i calculate the E.F of nitrogen 21% hydrogen 7.48% chlorine 66.35%
Sunday, January 25, 2015 at 6:00pm

Chemistry
B) if you are holding a piece of Silicon that weighs 28.1 gram (atoms mass of Silicon is 28.1) how many silicon atoms are you holding? (Answer in moles of atoms and in atoms )
Sunday, January 25, 2015 at 5:45pm

chemistry
3. One problem the researchers faced was an uncertainty about whether the signals observed in certain mass spectrometry data were, in fact, due to lead isotopes. Explain why this was a problem. In other words, why wasn't information about the mass of the isotopes ...
Sunday, January 25, 2015 at 4:18pm

chemistry
Diborane (B2H6) is a highly reactive boron hydride, which was once considered as a possible rocket fuel for the U.S. space program. Calculate ∆H for the synthesis of diborane from its elements, according to the equation 2 B (s) + 3 H2 (g) → B2H6 (g) using the ...
Sunday, January 25, 2015 at 4:09pm

Chemistry
3. Is determining the excess reactant and limiting reactant an important part of a synthesis reaction? Is it an important part of a decomposition reaction? Explain.
Sunday, January 25, 2015 at 2:51pm

chemistry
I need help with these questions 1. Calculate the percentage by mass of potassium in potassium sulfate K2 SO4 2. calculate the percentage by mass of nitrogen in ammonium nitrate Nh4 No3
Sunday, January 25, 2015 at 10:01am

chemistry
A CHM 111 student recorded the mass of a piece of dry lead metal as 23.7412 g. He obtained a graduated cylinder and recorded an initial water volume of 25.0 mL; upon addition of the metal, the water level rose to 27.1 mL. Calculate the density of lead in units of g/mL. (Watch ...
Sunday, January 25, 2015 at 9:15am

chemistry
Suppose you designed an experiment in which you burned a known quantity of magnesium in air. You used the product to determine how many moles of oxygen would react with the known number of moles of magnesium. Why would burning magnesium in air cause a source of error for this ...
Sunday, January 25, 2015 at 1:40am

math
The quadratic equation frequently appears in both the equilibrium and acid-base sections of General Chemistry. Therefore, it is useful to refresh the use of the quadratic before applying it to chemistry questions. Which of the following answers is a viable solution to the ...
Saturday, January 24, 2015 at 10:39pm

chemistry 116
Old fashion steam locomotives operated by boiling water and using the steam to drive a piston that moved the train. How much energy ( in MJ) is required to turn 824 gallons of water at 100 C into steam? The heat of fusion for water is 6.01 kJ/mol and the heat of vaporization ...
Saturday, January 24, 2015 at 10:24pm

chemistry 116
Suppose someone had an excessive Friday evening drinking party and then did the ultra-dumb thing of driving home while drunk. Luckily, the person got pulled over by the police before they can injure anyone else. The police took a blood alcohol reading of 1.80 % (expressed as ...
Saturday, January 24, 2015 at 10:23pm

chemistry 116
Chlorine is used to disinfect drink water supplies and pool water. Suppose you have 13.8 L of Cl2 in a cylinder at 1000 torr and 24 C. How many grams of chlorine do you have in the gas cylinder?
Saturday, January 24, 2015 at 10:23pm

chemistry help
What are the differences in measuring the molar mass using freezing point depression between studying ionic solids and molecular solids?
Saturday, January 24, 2015 at 9:36pm

chemistry
A sample of 10.00g of a solid unknown was dissolved in 25.00g of water. Assuming that pure water freezes at 0.0°C and the solution freezes at -5.58°C, what is the molal concentration of the solution? What is the molar mass of the solid? Show your calculation. I got ...
Saturday, January 24, 2015 at 9:35pm

chemistry 113
The AM band of radio waves are measured in kilohertz (kHz), which are the numbers you see on the AM radio dial. Therefore, a radio station at 610 on the AM dial has a frequency of 610 kHz or 610,500 Hz. What is the wavelength of the radio station that has a frequency of 1100 ...
Saturday, January 24, 2015 at 7:35pm

chemistry 113
What is the wavelength of light that has a frequency of 6.80E+14 Hz. Express the wavelength in nanometers
Saturday, January 24, 2015 at 7:33pm

chemistry 113
How many grams of sodium sulfate do you need to create 750 mL of a 0.250 M solution of sodium sulfate
Saturday, January 24, 2015 at 7:32pm

chemistry 113
What is the molar mass of iron(II) chloride tetrahydrate? The error interval is +/- 2 g/mol.
Saturday, January 24, 2015 at 7:31pm

chemistry 116
You have a rigid sealed container held at a constant temperature. You add 3.3 atm of oxygen gas, 1.7 atm of nitrogen and 4.2 atm of methane to it. What is the partial pressure of the oxygen gas in the container
Saturday, January 24, 2015 at 7:30pm

chemistry
Calculate the final temperature if 50 kg of iron is heated from 15.0°C with 5000 kJ of heat. The molar heat capacity of iron is 25.08 J mol–1 K–1.
Saturday, January 24, 2015 at 7:00pm

Chemistry (Chromatography)
Comment on the order of elution of the following solutes in (a) normal-phase and (b) reversed-phase liquid chromatography. Give reasons for the difference. Solute X nonpolar Solute Y polar, a dipole Solute Z polar, more polar than Solute Y
Saturday, January 24, 2015 at 2:41am

Chemistry
Consider the titrtation of 25.0mL of 0.0100M Sn2+ by 0.0500M TI3+ in 1 M HCL, using Pt and Saturated Calomel Electrodes to find the endpoint. F=96486.7 Cmol E0 Sn4+/Sn2+ =0.15V E0 TI3+/TI+ = 1.28 Esce = 0.241V R=8.3141 J K Mol (D) calculate E at the following volumes of TI3...
Saturday, January 24, 2015 at 2:35am

Chemistry
What two factors influence the effectiveness of molecular collisions in producing chemical change?
Saturday, January 24, 2015 at 1:45am

chemistry
What amount of carbon dioxide is produced per kJ of heat produced in burning ethene, C2H4?
Friday, January 23, 2015 at 10:27pm

Chemistry
how many moles of glucose can be burned "biologically" when 10.0 mol of oxygen is available? C6 H12 O6 + 6CO2 -> 6CO2 +6H2O
Friday, January 23, 2015 at 9:17pm

chemistry
Answer the following questions based on this reaction: Pb(NO3)2 (aq) + 2 NaCl (aq) --> PbCl2 (s) + 2 NaNO3 (aq) a) If 225 mL of 12.95 M Pb(NO3)2(aq) are reacted with a solution made with 5.05 g of NaCl (aq), how many grams of lead (II) chloride will be precipitated b) If ...
Friday, January 23, 2015 at 6:51pm

chemistry
If 80.0 g of bromine is added to 40.0 g of sodium, a) what is the limiting reactant? b) what is the excess mass of the reactant? c) what is the mass of product?
Friday, January 23, 2015 at 6:49pm

chemistry
Given that Avogadros's number is 6.02x10^23. Calculate the numbe of molecules present in 5.0moles of nitrogen gas -N2(g)
Friday, January 23, 2015 at 4:12pm

Chemistry
What is the form in which phosphorus exists in plant food and what ion could you use to precipitate the phosphorus.
Friday, January 23, 2015 at 3:52pm

chemistry
Please help what is the molecule CH3CH2CHCHCH3
Friday, January 23, 2015 at 3:21pm

chemistry
What mass of KBr is contained in 50.0 mL of a 5.10 M solution of KBr?
Friday, January 23, 2015 at 2:47pm

chemistry
How do gas particles exert pressure on their container?
Friday, January 23, 2015 at 2:42pm

integrated physics and chemistry
The velocity of a car traveling north decreases from 20 m/s to 12 m/s in 32 seconds. What is the acceleration of the car? I answered it as 0.25 m/s^2 North. Is this correct?
Friday, January 23, 2015 at 1:51pm

Chemistry
Zinc iodide is dissolved in 2.5 L of water to make a solution. 1.00 L of this solution is then diluted to make 12.0 L of a 0.50 M solution. What mass of zinc was added to make the original solution?
Friday, January 23, 2015 at 1:46pm

Chemistry (CHEM1380)
Let the temperature T in a body be independent of z so that it is given by a scalar function: T = 9x^2 + 4y^2 . Identify the isotherms T(x,y) = const.
Friday, January 23, 2015 at 12:23pm

chemistry
Is sodium isotonic with Mg²+
Friday, January 23, 2015 at 3:26am

Chemistry
The average concentration of chloride ions (molar mass = 34.353) in seawater is 19.353 grams per kilogram. The maximum allowable concentration of chloride ion in drinking water is 250 ppm by mass. How many times as much chloride ion is there in seawater than the maximum amount...
Thursday, January 22, 2015 at 10:40pm

chemistry
Solid lead(II) iodide was prepared by reacting 65.0 mL of a solution containing 0.218 M lead(II) ions with 80.0 mL of a solution containing 0.265 M iodide ions. If the actual yield of the reaction was 3.26 g, which choice is closest to the %yield of the reaction?
Thursday, January 22, 2015 at 9:44pm

Chemistry
In a titration experiment involving an unknown concentration of HCl and a 0.100M solution of NaOH(aq), it was determined that it took 12.5mL of NaOH to neutralize 20.0mL of the HCl(aq). Write a balanced chemical equation for this reaction and determine the concentration of the...
Thursday, January 22, 2015 at 7:07pm

Chemistry
Calculate the pH and concentration of H3O of a 0.285M HCl solution.
Thursday, January 22, 2015 at 7:04pm

Chemistry
Calculate the pH and concentration of H3O+ of a 0.285M oxalic acid solution.
Thursday, January 22, 2015 at 7:03pm

Chemistry
What is the pH of the resulting solution when 25.0mL of 0.100 HNO3(aq)are reacted with 20.0 mL of 0.175M NaOH(aq)? Is the resulting solution acidic or basic in nature?
Thursday, January 22, 2015 at 5:08pm

Chemistry
What is the pH of the resulting solution when 25.0mL of 0.100 HNO3(aq)are reacted with 20.0 mL NaOH(aq)? Is the resulting solution acidic or basic in nature?
Thursday, January 22, 2015 at 5:06pm

chemistry
Given: 2so2 + o2 -> 2so3 + 44kcal Which change increase the concentration of so4? a. increasing temperature b. increasing the concentration of o2 c. decreasing the pressure d. decreasing the concentration of so2
Thursday, January 22, 2015 at 3:18pm

Ionic compounds Scinece
3. What happens to the change on individual ions when they form ions? 11. Write the names of the two ions in each of the following compounds. (C) Na2O (E) Na3PO4 (G) NH4OH (H) Ca (NO3)2 8. Use the tables of metals, non-metals, and polyatomic ions and the Periodic table to name...
Thursday, January 22, 2015 at 2:48pm

Chemistry
What is the pH of a buffer solution of 0.125M Acetic acid and 0.250M Sodium acetate? the Pk of Acetic acid is 4.76
Thursday, January 22, 2015 at 1:33am

Chemistry
A 5.0ml sample of liquid requires 4.5 ml of a 0.093N NaOH solution. What is the titratable acidity of the liquid expressed as g/L Tartaric acid?
Thursday, January 22, 2015 at 1:29am

Chemistry
25.0 ml of a 0.13M HCL solution is titrated with 17.6 ml of NaOH. What is the Molarity of the NaOH?
Thursday, January 22, 2015 at 1:22am

Chemistry/Math
Calculate the following and round to the allowed number of significant figures 1. (18.00 x 1.5) / 0.00625 2.4.61 X 10^3 / 5.1008 x 10^-4 My answers 1. 4320 2. 9.037 x 10^-1 Please explain what I did wrong if I'm incorrect. Thank you
Thursday, January 22, 2015 at 12:07am

Chemistry
A solution contains 1.694 mg of CoSO4 (MW 155.0) per mL. Calculate a) The volume of 0.008640 M EDTA needed to titrate a 25.00 ml aliquot of this solution. Step 1. 0.001694g * 25ml * 1/155 g/mol= 0.0002732 mol Step 2. Volume of EDTA needed = 0.0002732 mol/ 0.008640 M = 0.03125 ...
Wednesday, January 21, 2015 at 11:07pm

chemistry
Calculate the number of grams of sulfuric acid in 1 gallon of battery acid if the solution has a density of 1.25g/mL and is 38.3{\rm \\%} sulfuric acid by mass.
Wednesday, January 21, 2015 at 10:43pm

chemistry
A mixture of N2(g) and H2(g) has mole fractions of .40 and .60, respectively. What is the density of the mixture at 1 bar and 0 degrees celsius?
Wednesday, January 21, 2015 at 10:09pm

chemistry
C6H12 = 9O2 --> 6CO2 = 6H2O + 3,690 kJ *Personally Balanced* What quantity of heat is produced if 32g of cyclohexane react with 95 L of oxygen at STP? *My work so far is below* 95L*(1 mol O2/22.4L) = 4.2 mol O2 What would be the next motive?
Wednesday, January 21, 2015 at 9:53pm

Chemistry
Calculate the mass of a 0.253-mL sample of a liquid with density 0.789 g/mL
Wednesday, January 21, 2015 at 9:52pm

chemistry
Calculate the volume in milliliters of a 5.41-g sample of a solid with a density of 3.01 g/mL
Wednesday, January 21, 2015 at 9:49pm

Chemistry (Re-post)
A solution contains 1.694 mg of CoSO4 (MW 155.0) per mL. Calculate a) The volume of 0.008640 M EDTA needed to titrate a 25.00 ml aliquot of this solution. So this is my working out for this section, Step 1. Moles of CoSO4 = 0.0001694mg * 25mL * (1mol/155g/mol) 2.732*10^-4. ...
Wednesday, January 21, 2015 at 6:21pm

Chemistry (Electrochemistry)
Consider the titrtation of 25.0mL of 0.0100M Sn2+ by 0.0500M TI3+ in 1 M HCL, using Pt and Saturated Calomel Electrodes to find the endpoint. F=96486.7 Cmol E0 Sn4+/Sn2+ =0.15V E0 TI3+/TI+ = 1.28 Esce = 0.241V R=8.3141 J K Mol (a) Write the balanced reaction. Sn4+ + 2e- <...
Wednesday, January 21, 2015 at 5:51pm

Chemistry
Calculate the percentage of by mass of nitrogen in ammonium nitrate Nh4 No3
Wednesday, January 21, 2015 at 5:43pm

Chemistry
How much energy (in kilojoules) is released when 15.2g of steam at 114.5∘C is condensed to give liquid water at 63.5∘C? The heat of vaporization of liquid water is 40.67 kJ/mol, and the molar heat capacity is 75.3 J/(K⋅mol) for the liquid and 33.6 J/(K⋅...
Wednesday, January 21, 2015 at 5:26pm

chemistry
How much work is done at 1.2 atm and 316 K when 1 mole of propane undergoes combustion? C3H8 (l) + 5O2 (g) → 3CO2 (g) + 4H2O (l)
Wednesday, January 21, 2015 at 4:18pm

Chemistry
A 5.00 g mixture of methane (CH4) and ethane (C2H6) is combusted in oxygen gas to produce carbon dioxide and water. If 14.09 g of CO2 is produced, how many grams of methane was in the original 5.00 g mixture ?
Wednesday, January 21, 2015 at 2:15pm

Chemistry
Bromine is a reddish-brown liquid. Calculate its density (g/mL) if 586g of the substance occupies 188 mL.
Wednesday, January 21, 2015 at 11:11am

chemistry
A 0.8743 g sample of KHP was titrated 42.45-mL of NaOH solution until the phenolphthalein endpoint. What is the molarity of the NaOH solution?
Wednesday, January 21, 2015 at 10:50am

Analytic chemistry
A solution of HClO4 was standardized by dissolving 0.3745 g of primary standard grade HgO in a solution of KBr. The liberated OH- required 37.99 mL of the acid to be neutralized. Find the molarity(M) of HClO4. The given balanced chemical equation is: HgO + 4Br- + H20 ===> ...
Wednesday, January 21, 2015 at 8:17am

Chemistry (Acid-Base)
Butanoic acid (Ka = 1.52 x 10-5) has a partition coefficient of 3.0 (favouring benzene) when distributed between water and benzene. Find the concentration of butanoic acid in each phase when 20.0 mL of 0.10 M aqueous butanoic acid is extracted with 25 mL of benzene at (a) pH 4...
Wednesday, January 21, 2015 at 5:59am

Chemistry
The following data are for a liquid chromatographic column: Length of packing (L) 24.7 cm Flow rate 0.313 mL/min VM 1.37 mL VS 0.164 mL A chromatogram of a mixture of species A, B, C and D provided the following data Retention time Nonretained 3.1 - A = 5.4 B = 13.3 C = 14.1 D...
Wednesday, January 21, 2015 at 4:25am

Chemistry
How many grams of CaCl2 * 6H2O are required to make 500 milliliters of a solution having the same concentration of Cl- as one that was prepared by dissolving 75.6 grams of NaCl in enough water to make exactly 1 liter of solution?
Tuesday, January 20, 2015 at 11:20pm

AP Chemistry
Calculate the entropy change when 4.88 g of H2 reacts with O2 according to the reaction 2H2(g) + O2(g)→2H2O(ℓ)at 298 K and 1 atm pressure. The standard molar enthalpy of formation of H2O(ℓ)at 298 K is −285.8 kJ/mol. The corresponding free energy of ...
Tuesday, January 20, 2015 at 10:28pm

Chemistry
How would you know if a salt will produce a neutral, acidic or basic solution? I am quite confused. I know you first break them up into their ions but I dont know what to do next. For example: NaH2PO4= acidic soln Mg(HSO4)2= neutral soln Ca(CN)2= basic soln NH4F= acidic soln
Tuesday, January 20, 2015 at 10:07pm

chemistry
A 12.42 gram sample of a mixture of NaCl and CaCl2 is dissolved in water and all the chloride is precipitated as AgCl. If the AgCl precipitate has a mass of 31.70 grams. How do I find the mass percentage of each component in the original mixture?
Tuesday, January 20, 2015 at 9:32pm

AP Chemistry
A sample of air contains 12.8 µg/m3 of beryllium dust. How many atoms of beryllium are present in a room with dimensions of 8 feet by 13 feet by 15.1 feet? Answer in units of atoms
Tuesday, January 20, 2015 at 9:24pm

Chemistry
if you start with 20.0g of phosphorus 30.0g of oxygen gas, and 15.0g water, what is the maximum mass of phosphoric acid that can be formed?
Tuesday, January 20, 2015 at 9:08pm

AP Chemistry
A saturated solution of CaF2 (of MW 78.0 g/mol) contains 0.0167 grams per liter. What is the solubility product constant of CaF2?
Tuesday, January 20, 2015 at 8:32pm

AP Chemistry
The Ksp of Ni(CN)2 is 3.0 × 10−23. What is the molar solubility of Ni(CN)2 in a 0.065 M KCN solution? Answer in units of mol/L. I found that the normal molar solubility is 1.957x10^-8, but I don't know how the KCN solution affects it. Sig figs aren't ...
Tuesday, January 20, 2015 at 8:22pm

Chemistry
Virtually all the nitric acid manufactured commercially is obtained by the ammonia oxidization process. This involves this first step: Ammonia gas combines with oxygen to form nitrogen monoxide and water vapour. a) Write a balanced equation for the reaction 6 NH3 + 4 O2 -> ...
Tuesday, January 20, 2015 at 8:00pm

Chemistry
Our blood works mostly as a carbonic acid buffer which has an optimal buffering pH of about 6.4, the pH of blood is around 7.4. What is the advantage for the body of having the buffer at the non-optimal pH??
Tuesday, January 20, 2015 at 6:36pm

Chemistry
How would you know if a salt will produce a neutral, acidic or basic solution? I am quite confused. I know you first break them up into their ions but I dont know what to do next. For example: NaH2PO4= acidic soln Mg(HSO4)2= neutral soln Ca(CN)2= basic soln NH4F= acidic soln
Tuesday, January 20, 2015 at 4:33pm

chemistry
A mosquito fed on a solution containing phosphorous-32 is released. Phosphorous-32 has a half-life of 14 days. When the mosquito is recaptured 28 days later, what percentage of the original Phosphorus-32 will remain?
Tuesday, January 20, 2015 at 3:40pm

college chemistry
calculate the average kinetic energies of CH4 and N2 molecules at 273k and 546k
Tuesday, January 20, 2015 at 11:46am

Chemistry
Chemical properties of salts
Tuesday, January 20, 2015 at 10:03am

Chemistry
Calculate the change in pH if 10mL of 0.1M HCl is added to the buffer made by mixing 25 mL of 1.0 M CH3COOH and 25 mL of 0.5 M CH3COONa.
Monday, January 19, 2015 at 11:45pm

chemistry
In a soda acid fire extinguisher, concentrated sulfuric acid reacts with sodium hydrogen carbonate to produce carbon dioxide, sodium sulfate and water. How many moles of sodium hydrogen carbonate are produced from a reaction of 0.4 moles of sulfuric acid? Write the balanced ...
Monday, January 19, 2015 at 9:51pm

Chemistry
For another picnic, you want to make hamburgers with pickles, again without having any left over. You need to balance the number of packages of buns (which usually contain 8 buns) with the number of packages of hamburger patties (which usually contain 12 patties) and the ...
Monday, January 19, 2015 at 9:23pm

Chemistry
The following data are for a liquid chromatographic column: Length of packing (L) 24.7 cm Flow rate 0.313 mL/min VM 1.37 mL VS 0.164 mL A chromatogram of a mixture of species A, B, C and D provided the following data Retention time | Width of Base Nonretained 3.1 - A 5.4 0.41 ...
Monday, January 19, 2015 at 9:14pm

Chemistry
A 0.200 g sample containing Cu is dissolved, and a diethyldithiocarbamate coloured complex is formed. The solution is then diluted to 50.0 mL and the absorbance measured as 0.260. A 0.500 g sample containing 0.240% Cu is treated in the same manner, and the resulting solution ...
Monday, January 19, 2015 at 6:45pm

Chemistry
A solution contains 1.694 mg of CoSO4 (MW 155.0) per mL. Calculate a) The volume of 0.008640 M EDTA needed to titrate a 25.00 ml aliquot of this solution. moles CoSO4 = 0.001694mg/ 155 g/mol = 1*10^-6 mol Moles EDTA = 1*10^-6mol/0.025L = 0.000436 mol/L (in 25 mL) This is where...
Monday, January 19, 2015 at 6:38pm

Chemistry
Butanoic acid (Ka = 1.52 x 10-5) has a partition coefficient of 3.0 (favouring benzene) when distributed between water and benzene. Find the concentration of butanoic acid in each phase when 20.0 mL of 0.10 M aqueous butanoic acid is extracted with 25 mL of benzene at (a) pH 4...
Monday, January 19, 2015 at 6:24pm

Chemistry
If equal volumes of the following are combined, would they form buffered solutions? Why or why not? .1M HF and .05M NaF I'm am a bit confused about how I can figure out if these will form buffers or not, so I'd really appreciate it if someone could explain it to me. ...
Monday, January 19, 2015 at 6:05pm

chemistry
A sealed container comtains 1.50 mol of nitrogen gas, 2.00 mol of oxygen gas and 3.50 mol of argon gas. If the total pressure is 900 kPa, what is the pressure of the nitrogen gas? I dont know which formula to use
Monday, January 19, 2015 at 5:48pm

Chemistry
Please help! If equal volumes of the following are combined, would they form buffered solutions? Why or why not? .1M HF and .05M NaF I'm am a bit confused about how I can figure out if these will form buffers or not, so I'd really appreciate it if someone could explain...
Monday, January 19, 2015 at 5:48pm

Chemistry re-post
Consider the titrtation of 25.0mL of 0.0100M Sn2+ by 0.0500M TI3+ in 1 M HCL, using Pt and Saturated Calomel Electrodes to find the endpoint. F=96486.7 Cmol E0 Sn4+/Sn2+ =0.15V E0 TI3+/TI+ = 1.28 Esce = 0.241V R=8.3141 J K Mol (a) Write the balanced reaction. Sn4+ + 2e- <...
Monday, January 19, 2015 at 5:29pm

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