Thursday
May 28, 2015

Homework Help: Science: Chemistry

Recent Homework Questions About Chemistry

chemistry
Red sclae residue ( COPPER II ) partly dissolves in dilute acid to form a pale blue solution. Name the pale blue solution and give chemical equation to support your answer
Monday, May 4, 2015 at 6:02am

Chemistry
Question 2 - Liquid vitamin C, (ascorbic acid) C6H8O6 , readily reacts with atmospheric oxygen, O2, to form liquid dehydroascorbic acid, C6H6O6 and water. a) Explain why this is a chemical reaction. b) Write a balanced equation for this reaction. c) How many mole of oxygen gas...
Monday, May 4, 2015 at 2:35am

chemistry
What volume of 3.00M HCl in liters is needed to react completely (with nothing left over) with 0.750L of 0.400M Na2CO3?
Sunday, May 3, 2015 at 11:56pm

Chemistry(difficult)
A moon rock collected by a U.S. Apollo mission is estimated to be 3.70 billion years old by uranium/lead dating. Assuming that the rock did not contain any lead when it was formed, what is the current mass of 206Pb per 1.185 g of 238U in the rock? The half-life of 238U is t1/2...
Sunday, May 3, 2015 at 11:52pm

Chemistry
If you have a sample of gas with a volume of 15mL and it changes to 25mL , what would be the new pressure if the original pressure was 5.0 atm ?
Sunday, May 3, 2015 at 11:42pm

Chemistry
would you classify 2C(s) + H2(g) ---> C2H2(g) +227.4 as endothermic or exothermic? Why?
Sunday, May 3, 2015 at 11:23pm

Chemistry
How much heat is absorbed by a 2966 kg granite boulder as energy from the sun causes its temperature to change from 3°C to 31°C? 1000 g = 1 kg
Sunday, May 3, 2015 at 11:10pm

chemistry
how many grams of potassium carbonate are in 75.0ml of a 2.44M solution?
Sunday, May 3, 2015 at 9:59pm

chemistry--last time i promise
CO(g) + H2O(g)-->CO2 + H2 (g) reaction occurs in a 2.0 Ll reactor at 800 degrees celsius. The reaction conditions are such that a complete conversion of reactants into products results. The reactor is charged initially with 5.0 atm of CO and 8.0 atm of water vapor. ...
Sunday, May 3, 2015 at 8:23pm

Chemistry-Acids
Write a balanced chemical equation to show the reaction that occurs when each weak acid reacts with water. (Omit states-of-matter from your answer. Use the lowest possible whole number coefficients.) (b) HCHO2 I've gotten a and c correct, and from that I know that ...
Sunday, May 3, 2015 at 7:34pm

Chemistry
A scuba tank contains heliox, a special breathing gas composed of 5.0% oxygen and the remainder helium, for use by divers that spend extended amounts of time at depth underwater. The volume of the tank is 20 L and the pressure within it is 1500 lb/in2. Calculate the mass in ...
Sunday, May 3, 2015 at 7:09pm

chemistry
The molar heat of fusion of benzene is 9930 J/mol and ∆s= 35.7 j/mol-deg. Calculate the melting point.
Sunday, May 3, 2015 at 5:37pm

chemistry
As a research chimst, you are intrested in studying the extent and type of interactions in aqueous salt solution. As part of this study, you weight three samples of NaCl and dissolve each in 1.000kg H2O. You then measure the freezing temp. of each solution and compare these ...
Sunday, May 3, 2015 at 5:09pm

Chemistry
Underground miners formerly used headlamps in which calcium carbide (CaC2) was reacted with water to form acetylene (C2H2) gas as shown in the following reaction: CaC2(s) + H2O (l) ---> C2H2 (g) +Ca(OH2)(s) The acetylene produced was then burned to produce a very bright ...
Sunday, May 3, 2015 at 2:27pm

Chemistry (Molarity)
Indicate the concentration of each ion or molecule present: a mixture of 48.0 mL of 0.11 M KClO3 and 28.0 mL of 0.29 M Na2SO4. Assume the volumes are additive. a) [K+] b) [ClO3-] c) [SO42-] d) [Na+] We haven't taken notes on this particular type of problem yet and I can&#...
Sunday, May 3, 2015 at 12:41pm

chemistry
A 0.239 mol sample of PCl5(g) is injected into an empty 2.85 L reaction vessel held at 250 °C. Calculate the concentrations of PCl5(g) and PCl3(g) at equilibrium.
Sunday, May 3, 2015 at 12:25pm

chemistry
The half-life of C14 radioactive is 5760 yr. After how much time will 200 mg C14 sample be reduced to 25 mg?
Sunday, May 3, 2015 at 12:07pm

chemistry
Battery acid is 4.27MH2SO4(AQ.) And density of 1.25g/ml . What is the molality of H2SO4 in the solution
Sunday, May 3, 2015 at 4:21am

Chemistry
determine the mass of titanium and iodine that react if 1.38 x 10 to the third kJ of heat emitted by the reaction
Saturday, May 2, 2015 at 11:15pm

chemistry
How many sigma (σ) bonds and pi (π) bonds are in one molecule of arsenic acid, H3AsO4
Saturday, May 2, 2015 at 10:05pm

Chemistry
Use the info below to calculate how much it would cost you to produce 500g of NiSO4*6H2O . don't forget to include the cost of the original nickel token . Na2CO3*H2O costs $6.58/3 kg 6 M H2SO4 costs $12.65/5L 9 M HNO3 costs $10.53/2.5L Show clearly how you obtained your ...
Saturday, May 2, 2015 at 8:16pm

Chemistry
H2 (g)+I2 (g)↔2HI(g) Calculate ΔG for the system at 700 K when the concentrations are [H2] = 0.12M, [I2] = 0.27M, and [HI] = 0.118M. What would be my first step? If I make an ICE chart, what would I do from there? I just need the first step to help me out :( THANKS!
Saturday, May 2, 2015 at 8:00pm

Chemistry
A drug is eliminated from the body in a first-order reaction with a rate constant of 7.6 x 10-3 / min at 37 oC. A patient is given 20 mg of this drug. What mass of the drug remains after 5 hours?
Saturday, May 2, 2015 at 12:01pm

Chemistry
In 20 s, the concentration of NO2 decreases from 450 mM to 320 mM in the reaction 2 NO2 --> 2 NO + O2 (a) Determine the rate of reaction of NO2 (b) Determine the rate of formation of O2 (c) What is the unique rate of the reaction?
Saturday, May 2, 2015 at 11:31am

Chemistry
consider the reaction at 298K. 2H2S(eq) + SO2-----3S(s) + 2H2O (g). Calculate Grxn under these conditions. PH2S=2atm Pso2 =1.5 atm PH2O + 0.01atm
Friday, May 1, 2015 at 10:09pm

Chemistry
A flask contains 25.0 mL of diethyl ether weighth 18.74 µg (micrograms). What is the density of the diethyl ether and grams per liter? I'm not sure how to set this problem up correctly.
Friday, May 1, 2015 at 9:28pm

chemistry
What is the root mean square speed of argon gas at 300 K? 1. 4.33 × 102 m/s 2. 1.37 × 101 m/s 3. 3.96 × 102 m/s 4. 4.30 × 101 m/s 5. 5.92 × 102 m/s
Friday, May 1, 2015 at 9:04pm

chemistry
Given a percent yield of 45.0% for the reaction: H2 + Cl2 → 2 HCl(g) How many moles of HCl gas are produced if 15.5 L of Cl2 at STP and excess H2 are reacted? 1. 0.769 mol 2. 0.346 mol 3. 0.622 mol 4. 3.08 mol 5. 1.38 mol 6. 0.156 mol
Friday, May 1, 2015 at 9:03pm

Chemistry
Sulfur dioxide reacts with chlorine to produce thionyl chloride and dichlorine oxide S: 32.0 amu O: 16.0 amu Cl: 35.45 amu SO2 + 2Cl2 --> SOCl2 + Cl2O If 0.400 moles of chlorine gas reacts excess sulfur dioxide, how many moles of dichlorine oxide are forme?
Friday, May 1, 2015 at 6:42pm

Chemistry
Aluminum metal reacts with iron (III) oxide to produce aluminum oxide and iron metal. Answers the following three questions note: you will need to write a balanced equation to answer them Al: 26.9 amu Fe: 55.8 amu O: 16 amu 1 How many moles of iron (III) oxide are required to ...
Friday, May 1, 2015 at 6:42pm

Chemistry
Solutions of sodium hypochlorite, NaClO are sold as bleach. They are prepared by the following reaction: 2NaOH + Cl2 --> NaCl + NaClO + H2O If you have 2.32 mol of NaOH and 2.74 mol of Cl2 ga available to react, answer the following questions Na: 23.0 amu Cl:35.5 amu O: 16....
Friday, May 1, 2015 at 6:41pm

Chemistry
A flask contains 25.0 mL of diethyl ether weighth 18.74 µg (micrograms). What is the density of the diethyl ether and grams per liter?
Friday, May 1, 2015 at 6:39pm

Chemistry
In an experiment, 13g of methanol and 11 g of carbon monoxide were placed in a reaction vessel. Given the following reaction C:12.0 amu O:16.0 amu H:1.0 amu CH3OH + CO --> HC2H3O2 1 What is the theoretical yield of acetic acid? 2 If the actual yield of acetic acid is 19.1 g...
Friday, May 1, 2015 at 6:38pm

Chemistry
A mixture containing 11.9 g of calcium fluoride and 10.3 g of sulfuric acid is heated to drive off hydrogen fluorid. Given the following reaction what is the me maximum number of grams of hydrogen fluoride that can be obtied? Ca: 40.0 amu F: 19.0 amu H: 1.0 amu S 32.0 amu CaF2...
Friday, May 1, 2015 at 6:37pm

Chemistry
Molarity What is the final volume (in Liters) of a solution prepared by diluting 25 mL of 8.25 M sodium hydroxide to a concentration of 2.40 M?
Friday, May 1, 2015 at 6:36pm

Chemistry
An organic compound consists of only carbon, hydrogen, and oxygen. Through combustion analysis, 5.671g of water and 36.933g of carbon dioxide are formed from 17.422g of sample. C:12.0 amu O: 16.0 amu H:1.0 amu In the space provided please write the empirical formula and, if ...
Friday, May 1, 2015 at 6:35pm

Chemistry
Imagine that you have a 6.00L gas tank and a 3.00L gas tank. You need to fill one tank with oxygen and the other with acetylene to use in conjunction with your welding torch. If you fill the larger tank with oxygen to a pressure of 125atm , to what pressure should you fill the...
Friday, May 1, 2015 at 5:28pm

chemistry
Sodium peroxide reacts vigorously with water to produce sodium hydroxide and oxygen. The unbalanced equation is Na2O2(s) + H2O(ℓ) −! NaOH(aq) + O2(g) What mass of O2 is produced when 24 g of Na2O2 react? What mass of water is needed to react completely with the Na2O2?
Friday, May 1, 2015 at 5:06pm

Chemistry
Aluminum granules are a component of some drain cleaners because they react with sodium hydroxide to release both heat and gas bubbles, which help clear the drain clog. The reaction is 2 NaOH(aq) + 2 Al(s) + 6 H2O(ℓ) −→ 2 NaAl(OH)4(aq) + 3 H2(g) What mass of ...
Friday, May 1, 2015 at 4:59pm

Chemistry
Nitric acid can be produced by the reaction of gaseous nitrogen dioxide with water. 3 NO2(g) + H2O(ℓ) −→ 2 HNO3(ℓ) + NO(g) If 916 L of NO2 gas react with water, what volume of NO gas will be produced? Assume the gases are measured under the same ...
Friday, May 1, 2015 at 4:51pm

chemistry
Three gases (8.00 g of methane, CH4, 18.0 g of ethane, C2H6, and an unknown amount of propane, C3H8) were added to the same 10.0-L container. At 23.0 ∘C, the total pressure in the container is 4.50atm . Calculate the partial pressure of each gas in the container. Express...
Friday, May 1, 2015 at 12:07pm

chemistry
What is the resulting concentration when 250.0 mL of 0.65 M Magnesium Sulfate is added to 800.0 mL of water?
Friday, May 1, 2015 at 10:40am

Chemistry
Consider the titration of 20.0mL of 0.300M acetic acid, HAc, with 0.150M NaOH solution. Ka=1.75*10^-5 HAc + NaOH ---> NaAc + H2O What is the composition of the solution at the equivalence point of the titration? Give both the formula of the compound and its concentration. ...
Friday, May 1, 2015 at 9:53am

Chemistry
250.0 mg solid magnesium placed in 9.1 g aqueous zinc nitrate... What is the limiting reagent? I balanced the equation: Mg (s) + 2HNO3 (aq) -> Mg(NO3)2 (aq) + H2 (g) 250 mg 9.1 g
Friday, May 1, 2015 at 6:06am

Chemistry
There are three isotopes of phosphorus. Only one of them is stable. Calculate the binding energy per nucleon (in MeV) for P-32 (atomic mass = 31.9739 u). mass H = 1.007825 u and mass n = 1.008665 u. I multiplied the protons(15) by the mass H, and the neutrons(16) by the mass n...
Thursday, April 30, 2015 at 9:36pm

chemistry
If 765000 J of energy are added to 7.90 L of water at 291 K, what will the final temperature of the water be? Answer in units of K.
Thursday, April 30, 2015 at 7:52pm

chemistry
Calculate the mass of oxygen gas required to occupy a volume of 6 L at a pressure of 20.9 kPa and a temperature of 37◦C.
Thursday, April 30, 2015 at 6:55pm

chemistry
how much copper sulfate do i need to make a solution of 100ml of 1M copper sulfate?
Thursday, April 30, 2015 at 4:59pm

chemistry
Determine the percent yield for the following generic reaction using the information given below: Compound A --> Compound B if you start with 10.0 mL of Compound A and obtain 9.0 g of Compound B. Density of Compound A = 0.75 g/mL MW of Compound A = 150. g/mol MW Compound B...
Thursday, April 30, 2015 at 4:58pm

Chemistry
I need help on my chem lab... I need to give you background info so you know how to help me.. Data Sheet: Specific gravity of distilled water Temp of distilled water = 20 C Specific gravity: 1.0000 or 1.000 (according to hydrometer used) sugar solution 1 : mass 18.01 g volume ...
Thursday, April 30, 2015 at 4:39pm

Chemistry-is this right?
Water has a pH of 4.9? Calculate H3O and OH 1. H3O= 10^4.9=1.25*10^-5 2. OH= 14- 4.9= 9.1
Thursday, April 30, 2015 at 4:09pm

chemistry
How to calcuate therotical pH 1.) 0.1 M HCl measured pH=1 2.) 0.1 M NaOH measured pH=13?
Thursday, April 30, 2015 at 4:06pm

Chemistry
To titrate the acetic acid in 10.0 mL of vinegar sample, 25.5mL of 0.5M sodium hydroxide solution is needed. What is the concentration of acetic acid in the vinegar?
Thursday, April 30, 2015 at 2:19pm

Chemistry
20.00mL of 0.55M CH3COOH solution is mixed with 9.95mL of 1.0M NaHCO3 solution. The reaction occurring is CH3COOH + NaHCO3 --> CH3CHOO + Na + H2O +CO2. Which is the limiting reagent in this reaction?
Thursday, April 30, 2015 at 2:15pm

Chemistry Dr. Bob
I need help on my chem lab... I need to give you background info so you know how to help me.. Data Sheet: Specific gravity of distilled water Temp of distilled water = 20 C Specific gravity: 1.0000 or 1.000 (according to hydrometer used) sugar solution 1 : mass 18.01 g volume ...
Thursday, April 30, 2015 at 12:30pm

chemistry
Write the balanced net ionic equation for the following reaction and determine the conjugate acid-base pairs. HNO3(aq)+Li2CO3(aq)<--->LiNo3(aq)+​LiHCO3(aq) Which component in the net ionic equation is the acid, the base, the conjugate base, and the conjugate acid ...
Thursday, April 30, 2015 at 12:26pm

Chemistry
I need help on my chem lab... I need to give you background info so you know how to help me.. Data Sheet: Specific gravity of distilled water Temp of distilled water = 20 C Specific gravity: 1.0000 or 1.000 (according to hydrometer used) sugar solution 1 : mass 18.01 g volume ...
Thursday, April 30, 2015 at 12:09am

chemistry
CH4 (g) + 2 O2 (g) --> CO2 (g) + 2 H2O (g), (triangle)H rxn =-802.3 kj How much heat is produced by the complete combustion of 237 g of CH4?
Wednesday, April 29, 2015 at 9:56pm

chemistry
I posted my specific heat wrong. Now, how many joules is required to change temp of 225 g of lead from 5.0*C. specific heat of lead is 0.129J/g*C. I came up with 5805. It just doesnt look correct. Please help
Wednesday, April 29, 2015 at 9:45pm

chemistry
Write the balanced net ionic equation for the following reaction and determine the conjugate acid-base pairs. HNO3(aq)+Li2CO3(aq)<--->LiNo3(aq)+​LiHCO3(aq) Which component in the net ionic equation is the acid, the base, the conjugate base, and the conjugate acid ...
Wednesday, April 29, 2015 at 9:21pm

chemistry
How many joules is required to change the temp of 225 g of lead from 5.0*C to 25*C. specific heat of lead is 0.139J/g*C. I came up with 5805 and it just doesn't look right.
Wednesday, April 29, 2015 at 8:27pm

chemistry
Write the balanced net ionic equation for the following reaction and determine the conjugate acid-base pairs. HNO3(aq)+Li2CO3(aq)<--->LiNo3(aq)+​LiHCO3(aq) Which component in the net ionic equation is the acid, the base, the conjugate base, and the conjugate acid ...
Wednesday, April 29, 2015 at 8:24pm

Chemistry
H2S+H2O<-> H3O +HS why THIS BUFFER SOLUTION IS ABLE TO RESIST CHANGE IN PH WHEN SMALL AMOUNTS OF OH ARE ADDED TO IT.
Wednesday, April 29, 2015 at 7:45pm

Chemistry
Describe how you would prepare 250.0 mL of a 0.1500 M NaCl solution given that the NaCl is supplied as a solid. Describe how you would prepare 1.25 L of a 0.025 M sucrose solution from a stock solution with concentration of 5.00 M. What is the benefit of adding salt to water ...
Wednesday, April 29, 2015 at 7:41pm

Chemistry-is this right?
pH: 4.9 Calculate: H3O H30= 10^-pH H3O=10^-4.9 H30=1.25 * 10^-4 AND CALCULATE OH=14-pH OH=14-4.9 OH= 9.1
Wednesday, April 29, 2015 at 7:40pm

Chemistry
Solarcaine aerosol spray is used for temporarily relieving pain as it works as a topical anesthetic numbing the skin. Solarcaine is in fact benzocaine, C9H11NO2 with molar mass 165.2 g/mol. If a 100.0 mL spray can contains 1.00 g of benzocaine, calculate the pressure within ...
Wednesday, April 29, 2015 at 7:40pm

Chemistry
Liquid vitamin C, (ascorbic acid) C6H8O6 , readily reacts with atmospheric oxygen, O2, to form liquid dehydroascorbic acid, C6H6O6 and water. Explain why this is a chemical reaction. Write a balanced equation for this reaction. How many mole of oxygen gas is required to react ...
Wednesday, April 29, 2015 at 7:39pm

Chemistry
C6H12O6 (aq) = 602 (g) - 6CO2 (g) = 6H20 (l) H -2837 A)Exo or endothermic? B)write an expression for the equilibrium constant C)Give the value of the equilibrium constant is very large, would this reaction be fast or slow? D)effects of equilibrium if.. i. incerasing temp ii. ...
Wednesday, April 29, 2015 at 7:19pm

Chemistry
Calculate the pH of the resulting solution if 50 cm3 of 0.045mol dm-3 solution of C5H5N is mixed with 100 cm3 of 0.035 mol dm-3 of C5H5NH+
Wednesday, April 29, 2015 at 6:47pm

Chemistry
Based on the following balanced equation: 2 C4H10 + 13 O2 --> 8 CO2 + 10 H2O a. How many moles of CO2 are produced after complete reaction of 8.00 moles of C4H10? b. How many grams of CO2 are produced after complete reaction of 8.00 moles of C4H10? c. How many moles of H2O ...
Wednesday, April 29, 2015 at 6:15pm

Chemistry
Based on the following balanced equation: 2 NH3 + 2 O2 -->N2O + 3 H2O a. How many moles of O2 are required to react completely with 6.00 moles of NH3? b. How many grams of O2 are required to react completely with 6.00 moles of NH3? c. How many moles of H2O are produced ...
Wednesday, April 29, 2015 at 6:06pm

chemistry
Solution equals 0.015 M HCl Find OH Find pH Isn't pH=1.8? I don't know how to find OH :( Is there a formula or do subtract 14-1.8? I'm confused and I got this assignment today yet we haven't gone over anything yet.
Wednesday, April 29, 2015 at 5:41pm

Chemistry-is this correct?
Calculate the pH and identify as acidic, basic,or neutral 1. H= 1.10 * 10^-11 M Answer: pH=11, basic 2. H= 2.61 * 10^-2 M Answer: pH:1.58, acidic 3. OH= 4.0 * 10^-9 M pH: 8.39, basic
Wednesday, April 29, 2015 at 5:30pm

chemistry
the acid dissociation constant of dichloroethanoic acid is 0.033 . calculate the concentrations of hydrogen ions
Wednesday, April 29, 2015 at 3:49pm

Chemistry
Calculate OH and H pH= 12 How to set this up
Wednesday, April 29, 2015 at 3:44pm

Chemistry- is this right?
Calculate the H+ of 0.1 M NaOH Calculate the pH of 0.1 M NaOH [H+]=10^ph [H+]=10^-13 [H+]=1*10^-13M Since pH+ pOH=14 pH= -log (0.1M) pH=1 so 14-1 pH= 13
Wednesday, April 29, 2015 at 3:31pm

Chemistry
Calculate the H+ for number #2 #2 : H+ = 10^-2, with a pH of 2 Not sure how to calculate H+
Wednesday, April 29, 2015 at 3:12pm

Chemistry
A standard of red dye was prepared in the following manner: 4.5mL of 0.100M of food dye was added to a test tube and 5.5mL of water was added. What was the final concentration of food dye in the test tube?
Wednesday, April 29, 2015 at 2:40pm

Chemistry
66.9 g of a substance X dissolves in enough water to make 0.428 L of a 0.68 M solution. Calculate the molar mass of X in g/mol.
Wednesday, April 29, 2015 at 1:46pm

Chemistry
A 0.885 M solution of sulfuric acid (H2SO4) is to be reacted with a 0.552 M solution of sodium hydroxide to make sodium sulfate and water. How many L of the H2SO4 solution will react with 0.842 L of the NaOH solution? Give your answer to 3 decimal places.
Wednesday, April 29, 2015 at 1:44pm

CHEMISTRY
When one mole of C6H6 is burned, 3.27 MJ of heat is produced. When the heat from burning 5.35 g of C6H6 is added to 5.69 kg of water at 21.0°C, what is the final temperature of the water?
Wednesday, April 29, 2015 at 1:32pm

Chemistry
Carbon monoxide and hydrogen react according to the equation: CO(g) + 3H2(g) CH4(g) + H2O When 1.00 mol CO and 3.00 mol H2 are placed in a 1L flask at 1200K and allowed to come to equilibrium, the reaction mixture is found to contain 0.387 mol H2O. What is the molar ...
Wednesday, April 29, 2015 at 9:58am

chemistry
Table of enthalpy of solution for selected cesium salts Compound and ΔsolH kJ mol-1: - Cesium bromide: 25.98 - Cesium iodide: 33.35 - Cesium chloride: 17.78 - Cesium fluoride monohydrate: -10.46 - Cesium fluoride sesquihydrate (·1.5H2O): -5.44 Data taken from CRC ...
Wednesday, April 29, 2015 at 9:44am

chemistry
Calculate the freezing point of 1molar aqueous solution (density =1.04g) of kcl (kf for water =1.86)K=39,cl=35.5
Wednesday, April 29, 2015 at 8:35am

Chemistry
Calculate the pH of the resulting solution if 50 cm3 of 0.045mol dm-3 solution of C5H5N is mixed with 100 cm3 of 0.035 mol dm-3 of C5H5NH+
Wednesday, April 29, 2015 at 8:25am

chemistry
Calculate the concentrations of all ions after 50.0 mL of a 0.100 M AgNO3 solution is mixed with 100.0 mL of a 1.00 M Na2SO4 solution.For Ag2SO4 Ksp = 1.2 x 10-5 Do I first do MiVi=MfVf and then using the two concentrations I use ksp value? I'm just so confused.
Wednesday, April 29, 2015 at 1:01am

Chemistry
Sulfur trioxide decomposes into sulfur dioxide and oxygen in an equilibrium. You have a 3.00 L vessel that is charged with 0.755 mol of SO3. At equilibrium, the amount of SO3 is 0.250 mol. 2 SO3 (g) ----> 2 SO2 (g) +O2 (g) A) calculate the equilibrium concentrations of SO2 ...
Tuesday, April 28, 2015 at 10:40pm

Chemistry
A sample of krypton gas occupies 95.0 mL at 0.500 atm. If the temperature remained constant, what volume would the krypton occupy at (a) 5.00 atm, (b) 0.0500 atm, (c) 555 torr, (d) 5.00 torr, and (e) 5.5 3 1022 torr?
Tuesday, April 28, 2015 at 10:19pm

Chemistry
Determine the energy absorbed as two moles of Nitrosyl Chloride are disassociated into nitric oxide and chlorine gas (used bond energies of kJ per mole to determine your net energy released in Joules): 2NOC1(g)-->2NO(g)+C12
Tuesday, April 28, 2015 at 8:40pm

Chemistry
Determine the energy absorbed as two moles of Nitrosyl Chloride are disassociated into nitric oxide and chlorine gas (used bond energies of kJ per mole to determine your net energy released in Joules): 2NOC1(g)-->2NO(g)+C12
Tuesday, April 28, 2015 at 8:40pm

Food Chemistry
A new food colorant has a molar absorptivity of 3.8x 10^3 cm^-1M^-1 at 510 nm: (1) what will be the absorbance of a 2X10^-4 M solution in a 1 cm cuvette determined at 510 nm; (2) what will be the percent transmittance (T%) of the solution in (1) in this case
Tuesday, April 28, 2015 at 7:54pm

chemistry
is the reaction between Copper sulfate and zn exothermic or endothermic and does that involve the activity series?
Tuesday, April 28, 2015 at 5:43pm

Chemistry
A 1X Phosphate Buffered Saline solution was prepared by adding 1.44g of Na2HPO4 and 1.44g of H2PO4- to 800mL of water. Additional components were dissolved in the solution: 8g of NaCl, 0.2g of KCl and 0.24g KH2PO4. The resulting buffer solution had a pH of 7.2. a. Calculate ...
Tuesday, April 28, 2015 at 3:32pm

Chemistry
In a basic solution how does the concentration of H3O+ compare to concentration of OH-?
Tuesday, April 28, 2015 at 2:57pm

chemistry
Lithium chlorate is decomposed with heat to give lithium chloride and oxygen gas. If 2.23g of lithium chlorate is decomposed, how many milliliters of oxygen are released at stp?
Tuesday, April 28, 2015 at 2:45pm

Chemistry
How does a pH of a buffer solution go outside of its range?
Tuesday, April 28, 2015 at 2:44pm

chemistry
Calculate the approximate pH of a 0.1 M solution of ethanoic acid at 298 K, given that the dissociation constant, Ka, is 1.75 x 10-5 mol/L at 298 K.Ethanoic acid dissociates in aqueous solution as follows: CH3COOH(aq) + H2O H3O+(aq) + CH3COO-(aq)
Tuesday, April 28, 2015 at 1:49pm

Chemistry
Cobalt and nickel can be simultaneously determined by formation of their coloured complexes with 8-quinolinol in solution. Molar extinction coefficients are: εCo = 3529, and εNi = 3228 cm-1 M-1 at 365 nm; and εCo = 428.9 and εNi = 0 cm-1 M-1 at 700 nm. ...
Tuesday, April 28, 2015 at 10:26am

analytical chemistry
What weight of potassium acid phthalate(KHC8H4O4) is required to react with 25 ml OF 0.5N NaOH solution
Tuesday, April 28, 2015 at 6:45am

Chemistry
In which condition(s) can I get this reaction: Fe + H2SO4 = Fe2(SO4)3 + H2
Tuesday, April 28, 2015 at 6:17am

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