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February 11, 2016

Homework Help: Science: Chemistry

Recent Homework Questions About Chemistry

Chemistry
In the electrolysis of water 75.0 cm3 of oxygen gas are produced.How many cm3 of hydrogen are produced ?
Monday, November 23, 2015 by Nick

Chemistry
How commonly is salicylic acid used or found in nature ?
Monday, November 23, 2015 by Jake

Chemistry
patient on dialysis has a high level of urea, a high level of sodium and a low level of potassium in the blood. Why is the dialyzing solution prepared with a high level of potassium but no sodium or urea?
Monday, November 23, 2015 by ayyei

Chemistry
What is the Lewis structure for salicylic acid ?
Monday, November 23, 2015 by Jake

Chemistry
Calculate The volume occupied at s.t.p by 0.24g of ozone ( o=16, G.M.V=22.4dm3
Monday, November 23, 2015 by moses

chemistry
Write the structural formula of differnt isomers gives by the molecular formula CrCl3 6H2O.
Monday, November 23, 2015 by md rafiqul sk

chemistry
Determine if the following reaction is spontaneous under standard conditions. Zn(s) + 4 CN¡V(aq) + Ag2CrO4(s) „³ Zn(CN)42¡V(aq) + 2 Ag(s) + CrO42¡V(aq)
Monday, November 23, 2015 by cole

Chemistry
A gas weighing 23.6 g occupies a 10.0 L flask at 27 C and 780. torr of pressure. Calculate the molar mass of the gas.
Monday, November 23, 2015 by Ron

chemistry
Sketch the phase diagram of argon, Ar, from the following information: Normal melting point = –187°C Normal boiling point = ‒186°C Triple point = ‒189°C, 0.68 atm Critical point = ‒122°C, 48 atm Label the triple point, critical point and ...
Sunday, November 22, 2015 by elan

Chemistry
The reaction 2H2S(g)⇌2H2(g)+S2(g) Kc=1.67×10−7 at 800∘C is carried out with the following initial concentrations: [H2S] = 0.300 M , [H2] =0.300 M , and [S2] = 0.00 M. Find the equilibrium concentration of [S2].
Sunday, November 22, 2015 by hoooo

Chemistry
1. Which molecule should have the higher dipole moment, and why? a) COF2 because it contains more F atoms. b) COFH because the polar bonds in COF2 nearly cancel each other out. c)COF2 because it contains more lone pairs. >> I think the answer is a)?
Sunday, November 22, 2015 by Dan

Chemistry
For which element is the gaining of an electron most exothermic? a)Li b)N c)F d)B *explain
Sunday, November 22, 2015 by Mark

Chemistry
Anthracene is a yellow, crystalline solid found in coal tar. Complete this structure for anthracene, C14H10, by adding bonds and hydrogen atoms as necessary. What type of hybrid orbitals are utilized by carbon in anthracene? >>sp3 How many σ bonds and π bonds ...
Sunday, November 22, 2015 by Dan

Chemistry
Why does carbonate have a -2 charge and not -1? Why does phosphate have a -3 charge and not -2 or -1? Why does nitrate have a -1 charge and not -2 or -3? My answer: Based on the Lewis structure, these ions need a certain number of electrons in order to be stable...the octet ...
Sunday, November 22, 2015 by Christina

Chemistry
Rank the following in order of increasing bond polarity: H-F, H-Br, F-F, Na-Cl. Is it this....? F-F, H-Br, H-F, Na-Cl
Sunday, November 22, 2015 by Christina

chemistry
a 10.0 ml sample of a hcl solution is titrated with 32.6 ml of a 0.155 m naoh solution. what is the equation for the neutralization reaction?
Sunday, November 22, 2015 by lakeisha

Chemistry
Why does carbonate have a -2 charge and not -1? Why does phosphate have a -3 charge and not -2 or -1? Why does nitrate have a -1 charge and not -2 or -3? My answer: Based on the Lewis structure, these ions need a certain number of electrons in order to be stable...the octet ...
Sunday, November 22, 2015 by Christina

Chemistry
What is the pressure of 1.78 g of nitrogen gas confined to a volume of .118 L and 25 degrees Celsius?
Sunday, November 22, 2015 by Lyndsay

University
Chemistry The molar heat capacity of butane under constant pressure Cp=19.4 + 0.233 T J.mol' '.K' . Calculate the quantity of heat needed to increase the temperature from 27"C to 127 ° Cu under1 atm pressure.
Sunday, November 22, 2015 by Zahra

Chemistry
Calculate the molar concentration for each of the following. a)The concentration of a brine solution containing 225 g for pure sodium chloride dissolved in 4.00 L of solution. b)The volume that must be added to 4.2 mol of magnesium chloride to make a 0.045 M solution. c)The ...
Sunday, November 22, 2015 by Lyn

Chemistry
The overall cell reaction occurring in an alkaline battery is: Zn(s) + MnO2(s) + H2O(l) ---> ZnO(s) + Mn(OH)2(s) a) How many moles of electrons flow per mole of reaction?...answer: 2. Mol e-Note: b) If 6.09g of zinc is oxidized, how many grams of manganese dioxide and of ...
Saturday, November 21, 2015 by Dalton

chemistry
I have two that I can not figure out: #1: calculate the MOLALITY of 10.00 g/L of the salt, if its molar mass is 100.0 g/mol and solution density D=1.100 g/mL work: 10.00 g NaCl x (1mL/1.100g) x (1kg/1000 mL)= 0.00909 kg 100.0 g x (1 mol NaCl/58.4 g Nacl)= 1.7 mol 1.7/0.0090= ...
Saturday, November 21, 2015 by sam

Chemistry
7) A 3.33 g sample of iron ore is transformed into a solution of iron (II) sulfate. And this solution is titrated with 0.0150 M potassium dichromate. If it requires 41.40 mL potassium dichromate solution to titrate the FeSO4, find the percentage of iron in the ore? The mole ...
Saturday, November 21, 2015 by CHIPNDALE

Chemistry
7. Suppose 45.0 mL of 0.250 M HNO3 was mixed with 35.0 mL 0.600 M Ba(OH)2. Calculate the pH of the final solution.
Saturday, November 21, 2015 by CHIPNDALE

Chemistry
If 5.00L of argon gas is at 0.460 atm and -123C what is the volume at STP I think it's b
Saturday, November 21, 2015 by Miguel

Chemistry
Methyl alcohol can be prepared commercially by the reaction of hydrogen with carbon monoxide. Under equilibrium conditions at 7.00 × 102 K, [H2] = 0.0720 M, [CO] = 0.200 M, and [methanol] = 0.0300 M. Find the value of Kc, and then find the value of Kp. What is the value ...
Saturday, November 21, 2015 by Anonymous

Chemistry
What is the total number of joules of hear needed to change 200g of ice to water at O degree Celcius?
Saturday, November 21, 2015 by Andrea

Chemistry
What is the chemical formula for coconut oil?
Saturday, November 21, 2015 by Alicia

Chemistry
predict if precipitation will occur when 36ml of 0.0039M Na2CrO4 is mixed with 18ml of 0.00033M AgNO3. M.W of Ag2CrO4 :331.73g/mol Kspof ag2cro4 1.1x10^-12
Saturday, November 21, 2015 by Janna

Chemistry
An aqueous solution of KF is add dropwise to an aqueous micture containing 0.25M Ca2+ and 0.75M Mg2+ calcuate the minimum molarity of F that is nessaryvto initate the precipitation of each salt? Which precipitate first? Ksp of CaF2 :5.4x10^-9 Ksp of MgF2 :3.6x10^-8
Saturday, November 21, 2015 by Tom

chemistry
3.5g
Saturday, November 21, 2015 by feoluwa

chemistry
how many grams of CaCO3 will dissovle in 300ml of 0.05M Ca(NO3)2 ? Ksp of CaCO3 : 4.7x10^-9 M.W of CaCO3 100.01g/mol
Saturday, November 21, 2015 by Rose

Chemistry
A 27 g sample of germanium crystal contains 44 mg of arsenic. The arsenic is substitutionally incorporated into the crystal. Germanium has a band gap of 0.66 eV and an intrinsic carrier concentration at 25o C of 4.2e+13 cm-3. At what temperature (in oC) will the intrinsic ...
Saturday, November 21, 2015 by Anonymous

Chemistry
Balance the redox reaction below using the half-reaction method. Bi3+(aq) + Co(s)Bi(s) + Co2+(aq)
Friday, November 20, 2015 by Shahzaib

chemistry
A voltaic cell consists of a standard hydrogen electrode in one half-cell and a Cu/Cu2+ half-cell. Calculate [Cu2+] when E cell is 0.070 V. NOTE::::::::::::::::::::ANSWER IN SCTIENTIFIC NOTATION PLEASE!!! thank you!
Friday, November 20, 2015 by Dalton

Chemistry
NaN3--->Na+N2 How many moles of Na are produced if 3.5 moles NaN3 react?
Friday, November 20, 2015 by Mathew

General Chemistry
Calculate the standard heat of formation of acetaldehyde , 2C(s) + 2 H2(g) +1/2 O2 (g) ---> CH3CHO(g) given the following information? CH3CHO(g) + 5/2 O2 (g) --> 2H2O(l) + 2 CO2(g) DeltaH rxn =-1194 KJ H2(g)+ 1/2 O2 (g) --> H2O (l) DeltaH rxn =-286 KJ/mol C(s) + O2(g...
Friday, November 20, 2015 by ChemLove

CHEMISTRY
2BrF3(g)Br2(g) + 3F2(g) STANDARD ENTHALPY?
Friday, November 20, 2015 by KD

chemistry
According to the reaction below, how many grams of lithium oxide could be produced from 3.1 moles LiCl? 4 LiCl + O2 → 2 Li2O + 2 Cl2
Friday, November 20, 2015 by chemo

chemistry
According to the reaction below, how many grams of lithium oxide could be produced from 3.1 moles LiCl?
Friday, November 20, 2015 by chemo

Chemistry-Dr.Bob
A solution is prepared by mixing 50.0mL of 0.001 M HCl and 10.0 mL of 0.200 M NaCl. What is the molarity of chloride ions in this solution? My work: (0.001 mol/L)((0.05 L)= 0.005 mol HCl (0.200 mol/L)(0.01 L)= 0.002 mol NaCl 0.005+0.002=0.007 mol of chloride ions 0.007mol/(0....
Friday, November 20, 2015 by Sanaya

Chemistry
A sample of Br2(g) takes 38.0 min to effuse through a membrane. How long would it take the same number of moles of Ar(g) to effuse through the same membrane?
Thursday, November 19, 2015 by Alex

Chemistry
CO(g) effuses at a rate that is ______ times that of Xe(g) under the same conditions.
Thursday, November 19, 2015 by Alex

chemistry
a gold nugget and a silver nugget have a combined mass of 14.9g. The two nuggets are heated to 62C and dropped into 15.0mL of H2O at 23.5C. When thermal equilibrium is reached, the temperature of the H2O is 25.0C. Calculate the mass of each nugget. Denisty of H2O=0998g/mL ...
Thursday, November 19, 2015 by Jule

Chemistry
Zinc - .5 grams HCl- .2 moles Find the Mass of ZnCl2 [How would you solve this?]
Thursday, November 19, 2015 by Derrick

Chemistry
I have the mass of one element and the moles of a compound, How do I find the mass of it'd Product? [Zn + 2HCl = ZnCl2 + H2] (Slove for mass of ZnCl2)
Thursday, November 19, 2015 by Derrick

chemistry
what is the molarity of the KCI solution.
Thursday, November 19, 2015 by Anonymous

chemistry
Write the molecular,complete ionic, and net ionic equations for the reactions that occur, if any, when solutions of the following substances are mixed: a) nitric acid and potassium carbonate b) sodium bromide and lead nitrate c) acetic acid and calcium hydroxide d) calcium ...
Thursday, November 19, 2015 by Lyndsay

Chemistry
1.) Watch the animation, and observe the titration process using a standard 0.100 M sodium hydroxide solution to titrate 50.0 mL of a 0.100 M hydrochloric acid solution. Identify which of the following statements regarding acid-base titrations are correct Drag items A-F to: ...
Thursday, November 19, 2015 by LuigiR

Chemistry
A solution of 0.316 M KOH is used to neutralize 16.0 mL H3PO4 solution H3PO4(aq) + 3KOH(aq) ¨ K3PO4(aq) + 3H2O(l) If 30.3 mL KOH solution is required to reach the endpoint, what is the molarity of the H3PO4 solution? Molarity = ____________
Thursday, November 19, 2015 by LuigiR

Chemistry
What properties do metalloids display, and where are metalloids found on the periodic table?
Thursday, November 19, 2015 by Sara

Chemistry
Why did Mendeleev leave gaps in his early periodic table, and what was the ultimate importance of the gaps?
Thursday, November 19, 2015 by Sara

Chemistry
A student titrates a 25.00 mL sample of HCl. If 20.50 mL of 0.175 M of KOH is required to reach the end point, what is the concentration of the HCl? 25.0 mL HCl x 1L/1000 mL x 0.175 M/1 L = 0.004375 mol HCl 0.004375 mol HCl/20.50 mL KOH x 1000 mL/1 L = 0.213 M HCl (I'm ...
Thursday, November 19, 2015 by Linda

Chemistry
P4 (g) + 3O2 (g) <-> P4O6(s) At a particular temperature, Keq = 4.6. If [P4O6] at this temperature is 1.2M, calculate the concentration of P4 and O2 I'd rather have someone tell me how to do it, so I can do it myself since it's in preparation for an exam.
Thursday, November 19, 2015 by Gemma

Chemistry
What is the molality of each of the following solutions? 1)Dissolve 0.610 mol of citric acid, C6H8O7, in 1.35 kg of water. 2) Dissolve 0.200 mg of KBr in 5.50 mL of water. 3) Dissolve 4.05 g of aspirin, C9H8O4, in 145 g of dichloromethane, CH2Cl2. For some reason I keep ...
Thursday, November 19, 2015 by Rach

Chemistry
I'm solving for the mass of PEG for my 500ml solution, however I don't know what density should I use to convert 50g PEG/kg H2O? Should it be of the H2O or of PEG? Thank you very much! This is my solution: Concentration: 50g PEG/kg H2O Vol= 500 ml or 0.5L ?g PEG= 50g ...
Wednesday, November 18, 2015 by KIM: Please Help!

chemistry
how many liters of ammonia at STP are required to produce 4.65 grams of hydrogen fluoride?
Wednesday, November 18, 2015 by Anonymous

Chemistry
What is the pH of a solution resulting from the addition of 10.0 mL of 0.17 M HCl to 50.0 mL of 0.16 M NH3? Assume the volumes are additive. Kb of NH3 = 1.8 ✕ 10-5.
Wednesday, November 18, 2015 by John

chemistry
If 5.29 g of CuNO3 is dissolved in water to make a 0.370 M solution, what is the volume of the solution?
Wednesday, November 18, 2015 by Rasschael

chemistry
You have a 250ml solution of 0.13M calcium iodate. How many grams of potassium iodate need to be added to the solution to begin to precipitate calcium iodate? The solubility product constant for calcium iodate is6.47 *10^-6. B) you have a 250ml solution of 0.13 M calcium ...
Wednesday, November 18, 2015 by anonymous

Chemistry
What minimum volume of 14.0 M hydrochloric acid would be required to completely dissolve a 600.0 −g iron bar? I'm getting around 2.3 L but it's saying it's incorrect...
Wednesday, November 18, 2015 by Jorge

chemistry
You have a 250ml solution of 0.13M calcium iodate. How many grams of potassium iodate need to be added to the solution to begin to precipitate calcium iodate? The solubility product constant for calcium iodate is6.47 *10^-6. B) you have a 250ml solution of 0.13 M calcium ...
Wednesday, November 18, 2015 by anonymous

Chemistry
What is the function of a salt bridge in a galvanic cell? 1. To permit electrons to flow through the solution. 2. To maintain a steady flow of reactants from the cathode to the anode. 3. To form complex ions with the products of oxidation at the anode. 4. To maintain ...
Wednesday, November 18, 2015 by Anonymous

Chemistry
A solution is prepared by dissolving 3.0 × 10-4 mol of AgNO3 and 3.0 × 10-5 mol of K2CrO4 in 1.00 liter of solution. With respect to Ag2CrO4 (Ksp = 1.9 × 10-12), is the resulting solution saturated, supersaturated, or unsaturated? I know you do [Ag][CrO4} but...
Wednesday, November 18, 2015 by Anonymous

Chemistry
a 6.0 mole sample of Ca3(PO4)2 and a 12.0 mole sample of SiO2 react in an evacuated vessel. after one of the reactants is fully consumed, how much of the gas is created? How exactly would you solve this problem? Would you have to find the molar mass of both sides and divide by...
Wednesday, November 18, 2015 by Allison

Chemistry
A chemist prepared a solution by dissolving 52.0 g of hydrated sodium carbonate in water to a total volume of 5.00 dm3. The concentration was determined to be 0.0366 M. Determine the formula of the hydrated sodium carbonate.
Wednesday, November 18, 2015 by Billy

Chemistry
Calculate the value of theshielding constant if the first ionosaton energy of Helium is 3.98x10ᴧ -19 J/mol
Wednesday, November 18, 2015 by Roderick

Chemistry
One half-cell in a voltaic cell is constructed from a silver wire electrode in a .25 M solution of AgNO3 . The other half-cell consists of a zinc electrode in a .001 M solution of Zn(NO3)2. Calculate the cell potential I have no idea and am so stressed, Help please
Wednesday, November 18, 2015 by Anonymous

Chemistry
What is the net ionic equation of potassium carbonate combines with strontium hydroxide?
Wednesday, November 18, 2015 by Anonymous

Chemistry
What is the net ionic equation of potassium carbonate combines with strontium hydroxide?
Wednesday, November 18, 2015 by Anonymous

Intro to Chemistry
Does the Periodic table have any kind of pattern for brittleness? If so, what is it? For example, the elements on the left are more brittle, while the ones on the right are less brittle.
Wednesday, November 18, 2015 by Claire

chemistry
Maximum mass of water in combustion of 20g hydrogen?
Wednesday, November 18, 2015 by Anonymous

chemistry
At room temperature (25 °C), the gas ClNO is impure because it decomposes slightly according to the equation 2ClNO(g) Cl2(g) + 2NO(g) The extent of decomposition is about 4%. Based upon this, the approximate value of ΔG°298 for the reaction at that temperature is ...
Wednesday, November 18, 2015 by annoymous

Chemistry
Silver chloride has Ksp=1.6x10^-10 and silver cheomate has Ksp=9.0x10^-12. We have 1.00 liter of a solution contains both nacl(0.10M) and Na2cro4(0.10M) solid AgNo3 is added slowly and the solution is stirred well. a) which precipitate first Agcl or AgCro4? B)what are the ...
Wednesday, November 18, 2015 by Anonymous

chemistry
please show the step by step for theoretical yield /yield % of 1.963g NaHCO3-Na2CO3
Wednesday, November 18, 2015 by Anonymous

Chemistry
Calculate the pressure of 4.80g of ozone, O3, in a 2.45 L flask at 25 degrees C. Assume that the ozone completely decomposes to the molecular oxygen. 2O3(g) --> 3O2(g) Calculate the pressure inside the flask once the reaction is complete.
Wednesday, November 18, 2015 by Sarah

Chemistry (Check)
What is the volume of the gas in a balloon at -195 degrees C if the balloon has been filled to a volume of 5.0L at 25 degrees C? Vf = 1.3L
Wednesday, November 18, 2015 by Sarah

Chemistry
Calculate the density of methane gas, CH4, in kilograms per cubic meter at 25 degrees C and 956 mmHg. I got .8252 g/L but am getting confused with the converting units.
Wednesday, November 18, 2015 by Sarah

Chemistry - radioactivity
Hello Dr.Bob, could you please help me with this problem: Which of the following nuclides are most likely to decay via beta decay? a)200 78 Pt b)192 78 Pt c)188 78 Pt d)196 78 Pt
Tuesday, November 17, 2015 by Laurus

chemistry!
a) Find the pH at the equivalence point when 40ml of 0.025 M of methylamine (NH2CH3 and Kb = 4.4x10^-4) is titrated with 0.025 M HCl. b) The Kf for the complex ion Ag(NH3)2+ is 1.7x10^7. The Ksp for AgI is 1.5x10^-16. What is the molar solubility of AgI in a solution that is 2...
Tuesday, November 17, 2015 by Freddy

Chemistry (Help)
Calculate the DHrxn of C57H110O6 (s) + O2(g) --> CO2(g) + H2O(l) with DHf. C57H110O6(s) -390.70 O2(g) 0 CO2(g) -393.5 H2O(l) -285.840 I balanced the equation: 2C57H110O6 (s) + 163O2(g) --> 114CO2(g) + 110H2O(l) and my work: DHrxn = [(114x -393.5)+(110x -285.840)] - [(2x...
Tuesday, November 17, 2015 by Anonymous

Chemistry (Help)
Calculate the DHrxn of C6H12O6 (s) + O2 (g) --> CO2 (g) + H2O (l) with DHf. C6H12O6(s) -1260.04 O2(g) 0 CO2(g) -393.5 H2O(l) -285.840 I balanced the equation: C6H12O6 (s) + 6O2 (g) --> 6CO2 (g) + 6H2O (l) and my work: DHrxn = [(6x -393.5)+(6x -285.840)] - [(1x -1260.04...
Tuesday, November 17, 2015 by Anonymous

Chemistry
A student adds 5.50 g of dry ice (solid ) to an empty balloon. What will be the volume of the balloon at STP after all the dry ice sublimes (converts to gaseous )?
Tuesday, November 17, 2015 by Marquette

Chemistry
If you have a 578 g of fat (tristearin) stored in your body, how much heat will be produced when it is metabolized? tristearin is C57H110O6 The chemical reaction: C57H110O6(s) + O2(g) --> CO2(g) + H2O (l) DHf: C57H110O6(s) -390.70 O2(g) 0 CO2(g) -393.5 H2O(l) -285.840 I don...
Tuesday, November 17, 2015 by Anonymous

general chemistry
Determine the concentrations of Na2CO3, Na , and CO32– in a solution prepared by dissolving 2.57 × 10–4 g Na2CO3 in 1.50 L of water. Express all three concentrations in molarity. Additionally, express the concentrations of the ionic species in parts per million...
Tuesday, November 17, 2015 by Anonymous

Chemistry
What is the unit m^-1? The question I'm working on says "an electron in the hydrogen atom makes a transition from an energy state of principal quantum number nt to n=1. If the photon emitted has a wavelength of 95 nm, what is the value of nt? I was trying to use the ...
Tuesday, November 17, 2015 by Quinn

Chemistry
The standard entropy change for 1.00 moles of Ar as it evaporates at -185.7 °C (∆H°-185.7 = 1558 cal mol-1) is? 1. 17.8 J mol-1K-1 2. 87.5 J mol-1K-1 3. 15.0 J mol-1K-1 4. 46.0 J mol-1K-1 5. 74.5 J mol-1K-1 6. none of the previous answers I thought I would use ...
Tuesday, November 17, 2015 by Anonymous

chemistry
Calculate the ionic strength of a solution that contains 1.45g Na3PO4 in 0.500L of solution.
Tuesday, November 17, 2015 by tithi

Chemistry
Calculate the pressure in an evacuated 250mL container at 0 degrees C when the O2 in 1.00 cm^3 of liquid oxygen evaporates. Liquid oxygen has a density of 1.118 g/cm^3.
Tuesday, November 17, 2015 by Sarah

Chemistry
A solution contains 0.50M Nh3 and 1.50 M Nh4cl. What is the maximum concentration of mg2+ that can be present in such a solution without precipitating Mg(oh)2?
Tuesday, November 17, 2015 by Angel

Chemistry
A block of copper of unknown mass has an initial temperature of 69.1 ∘C . The copper is immersed in a beaker containing 93.4 g of water at 21.0 ∘C . When the two substances reach thermal equilibrium, the final temperature is 24.2 ∘C . Find mass of Copper
Tuesday, November 17, 2015 by Judy Blue

Chemistry
Calculate the pH during the titration of 40 ml of 0.1000 M HCl with 0.1000 M NaOH solution after the following additions of base: A.) 28.00 ML B.) 39.80 ML C.) 48.00 ML
Tuesday, November 17, 2015 by Braden

Chemistry
Fuel values, reported in units of KJ/g, are useful in comparing the efficiency of various energy sources on a mass basis. Determine the fuel value of the glucose and the tristearin. Which one, carbohydrates or fats, have the highest fuel value (and hence is the most efficient ...
Tuesday, November 17, 2015 by Anonymous

chemistry
I know everyone guessed i had a few more i couldnt do. Sorry but assistance please: 1.Sucralfate (molecular weight: 2087g/mol) is a major component of Carafate® which is prescribed for the treatment of gastrointestinal ulcers. The recommended dose for a duodenal ulcer is ...
Tuesday, November 17, 2015 by mikey

Chemistry (Help)
Calculate the DHrxn of C57H110O6 (s) + O2(g) --> CO2(g) + H2O(l) with DHf. C57H110O6(s) -390.70 O2(g) 0 CO2(g) -393.5 H2O(l) -285.840 I balanced the equation: 2C57H110O6 (s) + 163O2(g) --> 114CO2(g) + 110H2O(l) and my work: DHrxn = [224mol(-393.5+(-285.840))] - [165mol(-...
Tuesday, November 17, 2015 by Anonymous

Chemistry (Check)
Calculate the DHrxn of C6H12O6 (s) + O2 (g) --> CO2 (g) + H2O (l) with DHf. C6H12O6(s) -1260.04 O2(g) 0 CO2(g) -393.5 H2O(l) -285.840 I balanced the equation: C6H12O6 (s) + 6O2 (g) --> 6CO2 (g) + 6H2O (l) and my work: DHrxn = [12mol(-393.5+(-285.840))] - [7mol(-1260.04+0...
Tuesday, November 17, 2015 by Anonymous

chemistry
41. Ethyne, C2H2, used in welding react with oxygen as shown below.
Tuesday, November 17, 2015 by mark

chemistry
i am working on a practice worksheet and need help with a few i can not understand. please and thank you. I have to post them separately sorry 49.how many grams of water are needed to completely hydrolyze 30.8 g of the ester? A.0.416 g B.30.8 g C.11.3 g D.7.49 g 54. Sodium ...
Tuesday, November 17, 2015 by mark

Chemistry
al(i) Determine the number of moles of Ca2+ present in the titrated sample. (ii) Determine the [Ca2+] and hence the solubility of CaSO4.2H2O in the original 10.0 mL sample. so
Tuesday, November 17, 2015 by Mara

Chemistry
A 10.0 mL sample of supernatant liquid from the system described by equation 1 was titrated with 0.01022 M EDTA solution to an end-point at 16.90 mL. Titration of the blank gave a titre (end-point) at 1.45 mL. Determine the titration volume required to titrate the Ca2+ alone.
Tuesday, November 17, 2015 by Mara

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