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August 20, 2014

Homework Help: Science: Chemistry

Recent Homework Questions About Chemistry

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Chemistry
How many mL of 5.00 M NaCl must be diluted to produce 2.40 L of 0.150 M NaCl?
Monday, October 7, 2013 at 7:00pm

Chemistry
FeCl3(aq) + K2S(aq) Fe2S3(aq) + KCl(aq) Consider the unbalanced equation above. What is the maximum mass of Fe2S3 that can be produced when 54.5 mL of 0.480 M FeCl3 and 98.5 mL of 0.420 M K2S react?
Monday, October 7, 2013 at 6:59pm

Chemistry
C2H6(g) + O2(g) CO2(g) + H2O(g) (a) Consider the unbalanced equation above. What is the maximum mass of CO2 that can be produced when 21.0 g of C2H6 and 38.5 g O2 react? (b) If 24.7 g of carbon dioxide is actually produced by the reaction in part (a), what is the percent yield...
Monday, October 7, 2013 at 6:58pm

Chemistry
What is the maximum mass of the lower molar mass product that can be formed when 83.0 g of solid barium bromide and 20.5 g chlorine gas react?
Monday, October 7, 2013 at 6:58pm

Chemistry
Al(s) + HCl(aq) AlCl3(aq) + H2(g) Zn(s) + HCl(aq) ZnCl2(aq) + H2(g) Consider the unbalanced equations above. A 0.200 g sample of a mixture of aluminum and zinc metal is reacted with an excess of hydrochloric acid. Both metals react with hydrochloric acid. The sample produces ...
Monday, October 7, 2013 at 6:56pm

CHEMISTRY
Silver reacts with nitric acid to form nitrogen monoxide, silver nitrate and water. Calculate the volume of nitrogen monoxide gas (@STP) that can be produced from the reaction of 5.00g of silver?
Monday, October 7, 2013 at 5:35pm

chemistry
A lab tech had accidentally set out 16M HCl for this experiment. How much ( in mL) 16M HCl is needed to make 450mL of a 3M HCl solution?
Monday, October 7, 2013 at 5:22pm

chemistry
ethane,C2H6 burns in oxygen. A. what are the products of the reaction? B. write the balanced equation for the reaction. C. what mass of O2, in grams is required for complete combustion of 13.6 of ethane? D. what is the total mass of products expected from the combustion of 13....
Monday, October 7, 2013 at 5:07pm

Chemistry
Find the concentration of the polyprotic weak acid given the following: - 1 equiv needs 6 ml NaOH, 2 equiv needs 18 ml NaOH, 3 equiv needs 28 ml NaOH - pKa1 = 2, pKa2 = 3.9, pKa3, 10 - Molarity of NaOH = 0.175 - Total volume of NaOH = 28 ml - Volume of weak acid = 30 ml Please...
Monday, October 7, 2013 at 4:11pm

chemistry
An aqueous solution of glucose is made by disolving 8.75 g of glucose in 100 mL of water. Calculate molarity, molality and the mole fraction
Monday, October 7, 2013 at 3:52pm

chemistry
a metal object has a mass of 8.37
Monday, October 7, 2013 at 2:32pm

Chemistry
Calculate the molarity of a solution made by adding 28.2 mL of concentrated ammonia (28.0 % by mass, density 0.880 g/mL) to some water in a volumetric flask, then adding water to the mark to make exactly 500 mL of solution. (It is important to add concentrated acid or base to ...
Monday, October 7, 2013 at 11:42am

chemistry
When 5 grams of salt is dissolved in 95 grams of water the temperature of the solution increases 10°C how much heat is evolved the heat capacity of the solution is 1.1 cal/g°C
Monday, October 7, 2013 at 11:18am

Chemistry
If 89J of heat are added to a pure gold coin with a mass of 20g , what is its temperature change? Specific heat capacity of gold is 0.128 J/g∘C.
Monday, October 7, 2013 at 8:43am

HELP PLEASE - Chemistry
I need help with answering this question. What is the absolute entropy of 1.9 mol of gaseous ammonia at 2.8 bar and 298 K?
Monday, October 7, 2013 at 12:48am

Chemistry
What is the purpose of adding 100 mL of distilled water to a beaker containing metal nitrate solution?
Sunday, October 6, 2013 at 11:57pm

Chemistry
Identification of an unknown powdered metal by reaction with HCl: Why does the pH of the HCl solution initially increase very slowly when an unknown metal is first added to the acid solution, but gradually increase at a faster rate as the reaction proceeds to completion?
Sunday, October 6, 2013 at 11:53pm

chemistry
Suppose 13.8 g Na and 21.6 g of water are mixed. What is the theoretical yield in grams of hydrogen from this mixture. what is the % yield if 0.500 g of H2 is formed
Sunday, October 6, 2013 at 11:05pm

chemistry
If 4.0L of a 4.7M SrCl2 solution is diluted to 45L , what is the molarity of the diluted solution?
Sunday, October 6, 2013 at 10:14pm

chemistry
If 4.0L of a 4.7M SrCl2 solution is diluted to 45L , what is the molarity of the diluted solution?
Sunday, October 6, 2013 at 10:08pm

Chemistry
If 5.300 g of C6H6 is burned and the heat produced from the burning is added to 5691 g of water at 21 °C, what is the final temperature of the water? 2C6H6(l) +15O2 (g)----> 12CO2(g)+6H2O(l) +6542
Sunday, October 6, 2013 at 9:38pm

Chemistry
Convert the concentration of CoCl2 from 22.0 mg/mL into molarity.
Sunday, October 6, 2013 at 9:01pm

Chemistry
What is the purpose of adding distilled water to an HCl solution?
Sunday, October 6, 2013 at 8:27pm

Chemistry
How many years will it take for 88g tritium to decay to an 11g sample?
Sunday, October 6, 2013 at 7:47pm

chemistry
Mr. Arswan iss preparing a mixture for a science experiment. He measures 10.5 grams of wood shavings, 150 grams of iron filings, and 18.50 grams of salt. What is the total mass of Mr. Arswan`s mixture? A 30.5 grams B 179 grams C 150.5 grams D 17.9 grams
Sunday, October 6, 2013 at 6:55pm

chemistry
A certain microwave oven delivers 800. watts (J/s) of power to a coffee cup containing 45.0 g of water at 25.0°C. If the wavelength of microwaves in the oven is 9.75 cm, how long does it take, and how many photons must be absorbed, to make the water boil?
Sunday, October 6, 2013 at 5:46pm

CHEMISTRY
When we combine the three gas laws into one expression: V is directly proprtional to T P is directly propetional to T ---------> PV is directly proprtional to T P is inversely proportional to 1/V PV/T= constant *******I do not understand how PV is directly proportional to T...
Sunday, October 6, 2013 at 5:39pm

Chemistry
ZN(s) + 2H+(aq) produces ZN2+(aq) +H2(g) A sample of Zinc is placed in the ice calorimeter. if 0.0657g of Zinc causes a decrease of 0.109ML in the ice/water volume of the calorimeter, what is the enthalpy change, per mole of Zinc, for the above reaction per mole of zinc. ...
Sunday, October 6, 2013 at 4:47pm

chemistry
Manganese(III) fluoride, MnF3, can be prepared by the following reaction: 2MnI2(s) + 13F2(g) → 2MnF3(s) + 4IF5(l) If the percentage yield of MnF3 is always approximately 51%, how many grams of MnF3 can be expected if 40.0 grams of each reactant is used in an experiment?
Sunday, October 6, 2013 at 4:04pm

Chemistry - Please help
I need help with answering this question. Thanks! What is the absolute entropy of 1.9 mol of gaseous ammonia at 2.8 bar and 298 K?
Sunday, October 6, 2013 at 3:52pm

Chemistry
Ethanol (C2H5OH) is synthesized for industrial use by the following reaction, carried out at very high pressure. C2H4(g) + H2O(g) → C2H5OH(l) What is the maximum amount, in kg, of ethanol that can be produced when 1.65 kg of ethylene (C2H4) and 0.0610 kg of steam are ...
Sunday, October 6, 2013 at 3:13pm

Chemistry
I need help with answering this question. Thanks! What is the absolute entropy of 1.9 mol of gaseous ammonia at 2.8 bar and 298 K?
Sunday, October 6, 2013 at 2:45pm

Chemistry
The tripeptide is T-A-K 1. What is the overall charge of the tripeptide below pH 1.0? 2. What is the overall charge of the tripeptide at pH 12? 3. What type of intermolecular attractions could the side chains of the amino acids make with the solvent (water) at pH 7.4? (Note ...
Sunday, October 6, 2013 at 1:18pm

general chemistry
a 5.95 g sample of AgNO3 is reacted with excess BaCl2 according to the equation 2AgNO3 + BaCl2 yields 2AgCl + Ba(NO3)2 to give 3.17 g of AgCl. What is the percent yield of AgCl?
Sunday, October 6, 2013 at 11:42am

Chemistry
I need help with answering this question. Thanks! What is the absolute entropy of 1.9 mol of gaseous ammonia at 2.8 bar and 298 K?
Sunday, October 6, 2013 at 10:11am

Chemistry
In the space below, show your work for determining the volume, mass, and moles of baking soda Moles of baking soda reacted Mass of baking soda reacted (g) Volume of baking soda reacted 140 ml of vinegar 5 tsps of baking soda were used
Sunday, October 6, 2013 at 10:10am

chemistry
Volume (mL) of 2.15 M potassium hydroxide that contains 8.09 g of solute WebAssign will check your answer for the correct number of significant figures. mL
Sunday, October 6, 2013 at 12:26am

Chemistry
I am trying to figure out the molecular, ionic, and net equation for this question. HCl reacts with the precipitate formed from mixing Ni(NO3)2 and NaOH . This is what I got for the molecular but it is saying it wrong. Please help. Thank you. HCl(aq) + Ni(NO3)2(aq) + NaOH(aq...
Saturday, October 5, 2013 at 9:59pm

Chemistry
Can calcium hydroxide solution be used to distinguish Co(NO3)2 and Fe(NO3)3 solutions using only the titration technique? Why or why not?
Saturday, October 5, 2013 at 7:38pm

Chemistry
Will the 90-100 mL of distilled water added to the acid solution (10.00 mL) significantly change the moles of H3O+ in the 1.00 M HCl solution? Why or why not?
Saturday, October 5, 2013 at 7:29pm

Chemistry
I need help with answering this question. What is the absolute entropy of 1.9 mol of gaseous ammonia at 2.8 bar and 298 K? Thank you
Saturday, October 5, 2013 at 6:08pm

Chemistry
How to write the equation for the combustion of ethane C2H6?
Saturday, October 5, 2013 at 5:38pm

Chemistry
What is the absolute entropy of 1.9 mol of gaseous ammonia at 2.8 bar and 298 K?
Saturday, October 5, 2013 at 3:32pm

AP Chemistry
a student titrates three samples of 0.3% hydrogen peroxide solution made from a bottle of 3% hydrogen peroxide solution dated 10/31/2007. would you expect the calculated molarities of the samples to be higher or lower than the following values: trial 1: .0015 molar trial 2: ....
Saturday, October 5, 2013 at 3:30pm

chemistry
What is equlibrium position
Saturday, October 5, 2013 at 9:03am

Chemistry
What is the absolute entropy of 1.9 mol of gaseous ammonia at 2.8 bar and 298 K?
Saturday, October 5, 2013 at 2:09am

Chemistry 22
Table salt NaCl and sugar C12H22O11 are accidentally mixed. A 6.00 g sample is burned and 2.90 g of CO2 is produced. What was the mass percentage of the table salt mixture? Could you please show me all the way through if you can?
Saturday, October 5, 2013 at 12:38am

Chemistry 10
reaction of AgNO3 with BaO... Would it be Ag^+ + O^---> AgO (s)
Saturday, October 5, 2013 at 12:36am

Chemistry
NaHCO3 (s) + HC2H3O2 (aq) ---> ?
Friday, October 4, 2013 at 11:29pm

Chemistry
Write the balanced neutralization reaction between H2SO4 and KOH in aq. solution. .350 L of .410 M H2SO4 is mixed with .300 L of .230 M KOH. What concentration of sulfuric acid remains after neutralization? ______ M H2SO4
Friday, October 4, 2013 at 11:28pm

Chemistry
Write the balanced equation for (aq) Pb(ClO3)2 and (aq) NaI. Include phases. What mass of precipitate will form if 1.50 L of concentrated Pb(ClO3)2 is mixed with .250 L of .110 M NaI? Assume the reaction goes to completion.
Friday, October 4, 2013 at 11:26pm

Chemistry
Zinc reacts with hydrochloric acid according to the reaction equation... Zn (s) + 2HCl (aq) ---> ZnCl2 (aq) + H2 (g) How many milliliters of 5.00 M HCl (aq) are required to react with 5.55 g of Zn (s)??
Friday, October 4, 2013 at 11:21pm

Chemistry
The flask here contains 10.0 mL of HCl and a few drops of phenolphthalein indicator. The buret contains .270 M NaOH. What volume of NaOH is needed to reach the end point of titration? What was the initial concentration of HCl?
Friday, October 4, 2013 at 11:19pm

Chemistry
For the following, 2HBr (aq) + Ba(OH)2 (aq) ---> 2H2O (l) + BaBr2 (aq) write the net ionic equation including the phases
Friday, October 4, 2013 at 11:17pm

Chemistry
For the following chemical reaction... HCN (aq) + KOH (aq)----> H2O (l) + KCN (aq) write the net ionic equation, including the phases
Friday, October 4, 2013 at 11:10pm

Chemistry
When CO2(g) (0.009242 mol/L) and 0.009242 mol/L of H2(g) in a 460.0 L reaction vessel at 619.0 °C are allowed to come to equilibrium the mixture contains 1.327 mol of CO(g). What is the equilibrium concentration (mol/L) of H2(g)? CO2(g)+H2(g) = CO(g)+H2O(g)
Friday, October 4, 2013 at 9:55pm

Chemistry
When CH4(g) (0.06318 mol/L) and 16.43 mol of H2S(g) in a 130.0 L reaction vessel at 711.0 °C are allowed to come to equilibrium the mixture contains 0.04107 mol/L of CS2(g). What is the equilibrium concentration (mol/L) of H2S(g)? CH4(g)+2H2S(g) = CS2(g)+4H2(g)
Friday, October 4, 2013 at 9:55pm

Chemistry
When a sample of NH3(g) (296.5 grams) is placed in 140.0 L reaction vessel at 676.0 °C and allowed to come to equilibrium the mixture contains 6.250 mol of N2(g). What is the concentration (mol/L) of H2(g)? 2NH3(g) = N2(g)+3H2(g)
Friday, October 4, 2013 at 9:55pm

Chemistry
When F2(g) (0.02028 mol/L) and 0.02028 mol/L of Cl2(g) in a 460.0 L reaction vessel at 774.0 K are allowed to come to equilibrium the mixture contains 0.02898 mol/L of ClF(g). What concentration (mol/L) of F2(g) reacted? F2(g)+Cl2(g) = 2ClF(g)
Friday, October 4, 2013 at 9:55pm

Chemistry
When a sample of I2(g) (0.07249 mol/L) is placed in 130.0 L reaction vessel at 865.0 K and allowed to come to equilibrium the mixture contains 0.1110 mol/L of I(g). What concentration (mol/L) of I2(g) reacted? I2(g) = 2I(g)
Friday, October 4, 2013 at 9:55pm

Chemistry
When a sample of I(g) (18.15 mol) is placed in 59.00 L reaction vessel at 605.0 °C and allowed to come to equilibrium the mixture contains 6.938 mol of I2(g). What is the concentration (mol/L) of I(g)? 2I(g) = I2(g)
Friday, October 4, 2013 at 9:55pm

Chemistry
Many portable gas heaters and grills use propane, C3H8(g). Using enthalpies of formation, calculate the quantity of heat produced when 15.0g of propane is completely combusted in air under standard conditions. Assume that liquid water is forming.
Friday, October 4, 2013 at 8:58pm

Chemistry
Can someone walk me through how to work this I have no clue where to start. I have converted grams to moles and Celsius to kelvin but I don't know where to go from there. Thank you! A piece of dry ice (solid CO2, d = 0.900 g/mL) weighing 21.0 g is placed in a 0.870 L ...
Friday, October 4, 2013 at 8:44pm

AP Chemistry
assuming a density of 1.0 g/mL, calculate the molarity and mole fraction of 3.0% h2o2
Friday, October 4, 2013 at 7:03pm

water treatment,chemistry
If the RQ is 6 and the k2t is 4, what is the removal efficiency of (CO2) of the co-current tower aerator. What will be the efficiency if a tower aeration with counter current flow is used instead? The efficiency of the co-current tower aerator (%): ____ The efficiency of the ...
Friday, October 4, 2013 at 9:46am

Water Treatment, Chemistry
The capacity of the groundwater treatment plant has recently been expanded to receive an additional 50,000 m3/year. As a result, all of the 6 rapid sand filtration are being operated. Assume a peak flow factor of 1.5. If the filtration rate is 5 m/h, what would be the area of ...
Friday, October 4, 2013 at 9:45am

chemistry lab
obtaining a smaller amount of sio2 than was present in the original sample
Friday, October 4, 2013 at 8:42am

chemistry lab
list the possible manipulation errors that might contribute in obtaining a significantly larger amount of nacl than was present in original sample
Friday, October 4, 2013 at 8:41am

Chemistry
How to differ AgBr from AgI? which is suitable for that among these...? Dil HNO3,Dil HCl,Dil H2SO4,Conc HNO3,Conc Cl3CCOOH
Friday, October 4, 2013 at 1:28am

chemistry
rank these amino acid from most polar to least: His, Phe, Ser, Ile, Asp, Trp i dont think my answer is correct... Ser>Asp>His>Phe>Trp>Ile
Thursday, October 3, 2013 at 11:44pm

chemistry
what is a catalyst
Thursday, October 3, 2013 at 8:40pm

Chemistry
A solution contains an unknown amount of dissolved magnesium. Addition of 3.38×10−2mol of Na2CO3 causes complete precipitation of all of the magnesium. What mass of magnesium was dissolved in this solution?
Thursday, October 3, 2013 at 7:34pm

chemistry
A student took 100 mL of a solution of Mg(OH)2 and reacted it with HCl (aq) to calculate the concentration of hydroxide ions in the solution. If 13.75 mL of 0.010M HCl was used to react with all of the OH- (aq) in the 100-mL solution, what was the concentration of hydroxide ...
Thursday, October 3, 2013 at 7:13pm

chemistry
when 15.0g of steam drops in temperature from 275.0 celsius to 250.0 celsius, how much heat energy is released?
Thursday, October 3, 2013 at 5:34pm

Chemistry
Using atomic masses, If a certain batch of D2O has a purity of 99.75 weight %, what is its purity in atom (actually molecule) %
Thursday, October 3, 2013 at 5:30pm

chemistry
the combustion of propane produces carbon dioxide and steam C3H8(g)+5O2(g) 3CO2(g)+4H2O(g)
Thursday, October 3, 2013 at 4:18pm

Basic Chemistry
2) Which of the following is a pure substance? (1point) Chocolate milk Orange juice Seawater*** Hydrogen peroxide (H2O2)
Thursday, October 3, 2013 at 1:59pm

Chemistry
1. Which of the following is one way to prevent the corrosion of iron? A. Paint exposed iron parts with protective paint. B. Protect the iron from polluted air. C. Add carbon to the iron. D. Let the iron develop a natural coat of carbonate. 2. The source of the sun's heat ...
Thursday, October 3, 2013 at 9:57am

Chemistry
A 50mL solution of Histidine-HCl (Histidine: pKa1=1.8, pKa2=9.2, pKa3=6.0)is titrated with 0.500M NaOH. What is the expected pH of the histidine solution at the points in the titration when 14.0mL, 26mL, and 38mL of the NaOH titrant is added?
Wednesday, October 2, 2013 at 10:53pm

Chemistry
How many moles are contained in 1.20 x 1024 molecules CO2?
Wednesday, October 2, 2013 at 9:43pm

chemistry
If a gas sample has a pressure of 31.3 kPa at 0.00°C, by how many degrees Celsius does the temperature have to increase to cause the pressure to double?
Wednesday, October 2, 2013 at 9:32pm

Chemistry
What is the balanced chemical equation for Sr(NO3)2 + Na2PO4
Wednesday, October 2, 2013 at 9:23pm

Chemistry 12
The original 10 ml (KIO3) solution is 0.020M is mixed with 10 mL of 0.0020M NaHSO3 which give a total volume of 20 mL. Calculate the concentration of KIO3 in the final mixture of the dilution.
Wednesday, October 2, 2013 at 9:19pm

chemistry
What are standard temperature and pressure? Why was a standard needed?
Wednesday, October 2, 2013 at 10:59am

Chemistry
The initial concentration for the compounds involved in the reaction shown were determined to be [ClF(g)] = 0.5789 mol/L, [F2(g)] = 0.5980 mol/L, [Cl2(g)] = 0.05037 mol/L. Calculate the value of the equilibrium constant (Kc) at 2500 K if the equilibrium concentration of F2(g) ...
Wednesday, October 2, 2013 at 10:23am

Chemistry
Calculate the value of the equilibrium constant (Kc) for the reaction displayed if the following equilibrium concentration data were measured at 723.0 K: [N2(g)] = 2.936 mol/L, [H2(g)] = 2.933 mol/L, [NH3(g)] = 3.443 mol/L. N2(g)+3H2(g) = 2NH3(g)
Wednesday, October 2, 2013 at 10:22am

Chemistry
Calculate the value of the equilibrium constant (Kc) for the reaction shown, if NO2(g) was found to be 95.54 % decomposed at 45.00 °C when its initial concentration was 5.725 mol/L. The initial concentration of the reaction products is 0 mol/L. 2NO2(g) = N2O4(g)
Wednesday, October 2, 2013 at 10:22am

Chemistry
If the initial concentration of BrCl(g) is 4.680 mol/L, calculate the % of BrCl(g) left over after the reaction reaches equilibrium according to the balanced equation. The value of Kc at 500.0 K is 32.00. The initial concentration of the reaction products is 0 mol/L. 2BrCl(g...
Wednesday, October 2, 2013 at 10:22am

chemistry
A ground state hydrogen atom absorbs a photon of light having a wavelength of 93.77 nm. It then gives off a photon having a wavelength of 1100 nm. What is the final state of the hydrogen atom
Wednesday, October 2, 2013 at 1:03am

Chemistry
A gas is confined to a cylinder under constant atmospheric pressure, as illustrated in the following figure. When the gas undergoes a particular chemical reaction, it absorbs 824J of heat from its surroundings and has 0.62kJ of P−V work done on it by its surroundings. ...
Wednesday, October 2, 2013 at 12:48am

chemistry (Dr.Bob222)
In a reaction, if the concentration decreases faster, that means the reaction has a larger rate constant, and a faster reaction, and a shorter half-life. Is that a correct statement? If not, please correct me, thanks for your help :)
Wednesday, October 2, 2013 at 12:12am

Chemistry
A 0.3146-g sample of a mixture of NaCl(s) and KBr(s) was dissolved in water. The resulting solution required 47.40 mL of 0.08765 M AgNO3(aq) to precipitate the Cl–(aq) and Br–(aq) as AgCl(s) and AgBr(s). Calculate the mass percentage of NaCl(s) in the mixture
Tuesday, October 1, 2013 at 10:44pm

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 ...
Tuesday, October 1, 2013 at 10:06pm

Chemistry
Convert 355.3 kg to tons. I start the problem: 355.3 kg to 1 kg then 1 x 10 to the third power, then I have 1g. My problem is that I don't know what to do with my 1 g. What is the next step?
Tuesday, October 1, 2013 at 8:57pm

Chemistry- moles
How do I determine the number of hydrogen atoms in .0885 mol Tetracarbon decahydrogen?
Tuesday, October 1, 2013 at 5:57pm

Chemistry
according to the balanced chemical equation 2SO2<--- 2 is a subscript...so anyway it's 2SO2+ O2 ----> 2SO3 How many liters of oxygen would be needed to produce 0.5 moles of sulfur trioxide, SO3?
Tuesday, October 1, 2013 at 5:33pm

Organic Chemistry
What reagents will separate, isolate, and purify 50% phenanthrene, 40% methyl 4-aminobenzoate, and 10% 1,4-dibromobenzene? The reagents to chose from are: 1 M naoh, 6 M naoh, 1 M hcl, 6 M hcl, 1 M nahco3, saturated sodium chloride, diethyl ether, 95% ethanol, methanol, ...
Tuesday, October 1, 2013 at 4:08pm

Chemistry
A 7.85 g sample of a compound with the empirical formula C5H4 is dissolved in 301 g of benzene. The freezing point of the solution is 1.05C below that of pure benzene. what are the molar mass and molecular formula of this compound?
Tuesday, October 1, 2013 at 2:56pm

chemistry science
substrate concentration= 3.5mM (c2) buffer=0.4 ml 10mM PNPP stock= ?ml (V1) water=?ml enzyme= 0.2ml total volume =1ml (V2) I need help with a dilution, I understand that you would be using c1v1=c2v2 but im confused as to what we need to find the amount of water and PNPP stock ...
Tuesday, October 1, 2013 at 2:32pm

Chemistry
Currently the removal of CO2 is too low and it has been proposed to change the deep well aeration with a co-current tower aerator. select the advantages of using deep well aeration from the below: Very high O₂ transfer within an exceptionally small space Very good ...
Tuesday, October 1, 2013 at 1:21pm

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