Saturday
May 23, 2015

Homework Help: Science: Chemistry

Recent Homework Questions About Chemistry

chemistry
If the volume is 226 L at 1.7 atm, find the volume at 2.8 atm. Assume the temperature and amount of gas remain constant. Answer in units of L.
Wednesday, May 6, 2015 at 10:47am

Chemistry
Copper has a specific heat of 0.387 J/g·°C. How much energy is required to raise the temperature of 460. g of copper from 34.5°C to 232.0°C?
Wednesday, May 6, 2015 at 9:51am

chemistry
A commercially. Available. Sample of sulphuric acid is 15percent h2so4 by weight density 1.10gm per ml find molality and normality
Wednesday, May 6, 2015 at 5:07am

Chemistry
Evacuated glass ampules is held at 1000 degree C with a perfect vacuum inside.estimate e steady state leak rate per unit area of nitrogen gas into th e ampule.the diffusivity of nitrogen gas is 10^-11 m^2/s.wall thickness of ampule is 0.5 mm.surface concentration of nitrogen ...
Wednesday, May 6, 2015 at 3:50am

Chemistry
Liquid vitamin C, (ascorbic acid) C6H8O6 , readily reacts with atmospheric oxygen, O2, to form liquid dehydroascorbic acid, C6H6O6 and water. How many mole of oxygen gas is required to react with 1000.0 mg of vitamin C? Chemistry - DrBob222, Wednesday, April 29, 2015 at 10:...
Wednesday, May 6, 2015 at 2:18am

chemistry
water is flowing at 3 m/s in a horizontal pipe under a pressure of 200 kpa. the pipe, which narrows to half its original diameter, is laid out on a level ground? a) what is the speed of flow in the narrow section? b) what is the pressure in the narrow section? c)how do the ...
Wednesday, May 6, 2015 at 1:50am

Chemistry
A solution is made by dissolving 26.7 g urea, a nonelectrolyte, in 301 g water. (The vapor pressure of pure water is 23.8 torr at 25°C and 71.9 torr at 45°C.) Calculate the vapor pressure of this solution at 25°C.
Wednesday, May 6, 2015 at 1:15am

Chemistry
Helium is collected over water at 20.°C and 1.16 atm total pressure. What total volume of gas must be collected to obtain 0.597 g of helium? (At 20.°C the vapor pressure of water is 17.5 torr.)
Tuesday, May 5, 2015 at 10:35pm

chemistry
In a dry cell, MnO2 occurs in a semisolid electrolyte paste and is reduced at the cathode. The MnO2 used in dry cells can itself be produced by an electrochemical process of which one half-reaction is shown below. Mn2+(aq) + 2 H2O(l) MnO2(s) + 4 H+(aq) + 2 e - If a current of ...
Tuesday, May 5, 2015 at 10:27pm

chemistry
Pka of Ch3CO2H is 4.75 What is the equilibrium constant of the equation: Ch3Co2 (aq) + H20 (l) --> CH3CO2H(aq) + OH-(aq)
Tuesday, May 5, 2015 at 9:33pm

Chemistry
A piece of metal of mass 18 g at 107◦C is placed in a calorimeter containing 56.5 g of water at 25◦C. The final temperature of the mixture is 56.3◦C. What is the specific heat capacity of the metal? Assume that there is no energy lost to the ...
Tuesday, May 5, 2015 at 8:17pm

Chemistry
Pt(s)| Fe^3+ (aq, .1M), Fe^2+ (aq, 1M)|| Fe^3+ (aq, ?M), Fe^2+ (aq, .001M)| Pt(s) A.) Write anode reaction B.) Write cathode reaction D.) If E= .14V for this cell, calculate conc. of Fe^3+ on the right half of the cell E.) What is the max amount of work this system can do when...
Tuesday, May 5, 2015 at 7:11pm

Chemistry
When Solid NaHCO3 was placed in a rigid container witha volume of 2.5L and heated to 160 degrees Celsius, the equilibrium was reached. 2 NaHCO3(s) -> Na2CO3 (s) + CO2(g) + H2O(g) At equilibrium, some of the starting material remains and the total pressure of the system is 7...
Tuesday, May 5, 2015 at 6:28pm

Chemistry
Calculate the value of the equilibrium constant for the following reaction: PbI2 (s) + 2I- (aq) <-> PbI4 ^ 2- (aq) The solubility product constant Ksp for PbI2 is 9.8e-9 and the formation constant Kf for PbI4^2- is 3.0e4 I have Ksp=[PbI4^2-] Kf= [PbI4^2-] / [PbI2][I-]^2 ...
Tuesday, May 5, 2015 at 4:18pm

chemistry 121
If a solution of 0.5 M HOAc dissociates as follows: HOAc + H2O „® H3O+ + OAc-, what is the final [H3O+] in the solution? Ka for HOAc = 1.8„ª10-5. What is the pH of the above solution? What is the Kb for HOAc? not sure of the initial set up please help
Tuesday, May 5, 2015 at 3:02pm

chemistry
If 2.29 mL of a stock solution of acetic acid with a concentration of 0.723 M is mixed with 15.75 mL of water, what is the concentration of the diluted solution?
Tuesday, May 5, 2015 at 12:34pm

chemistry
Please help me with this question. Many thanks. Given a vial of IL-23 power 10ug. Calculate the amount of water require to reconstitute so that the final volume will be 100ug/mL.
Tuesday, May 5, 2015 at 11:43am

chemistry
Methane burns in air to give carbon dioxide and water. Give a chemical equation . Show(State ) how the mixtures of these gases can be separated
Tuesday, May 5, 2015 at 11:35am

chemistry
How many moles are contained in 3.25 L sample of an ideal gas at 25oC and 204 kPa?
Tuesday, May 5, 2015 at 11:24am

chemistry
Copper dissolves in dilute acid ( H2so4) to form a pale blue solution Which of the following equation is correct 1) Cu + H2sO4-----> CuSO4 + h2 2) Cu + 2H2so4--->Cuso4 + 2H20 + 2SO2
Tuesday, May 5, 2015 at 8:58am

chemistry
what is a mole
Tuesday, May 5, 2015 at 1:03am

chemistry
How many milliliters of a 4.5 M HCl solution would be needed to react completely with 5.8 g of aluminum? I know the answer is somewhere around 143 mL HCl, but I CANNOT figure out how to find that answer. I have done a conversion from g of Al to mL of HCl and I cannot find the ...
Tuesday, May 5, 2015 at 12:52am

chemistry
Water has a density of 0.997 g/mL at room temperature (25 C). If you have exactly 500 mL of water, what is its mass in kg?
Monday, May 4, 2015 at 10:20pm

Chemistry Help - Check Please
1) Describe 4 processes/forces that can explain all mechanism in Organic Chemistry? My answers: a) Electron Delocalization b) Hydrogen Bonding c) Aromacity d) Nucleophilic Substitution (SN1 & SN2) Thank you!
Monday, May 4, 2015 at 10:19pm

Chemistry help
1. Find the pH when there are 0.034 moles of h+ in a liter of solution 2. Find the pH when there are 1.6x10^-7 moles of h+ in 500 ml of solution Please help me on these only problems im struggling with, thank you!
Monday, May 4, 2015 at 9:57pm

Chemistry
At home, you dissolve 26.0 g of AlCl3 in 1.5 kg of water. What is the freezing point of this solution? (Normal f.p = 0.0 C, Kf= 1.86 C kg/mol)
Monday, May 4, 2015 at 9:51pm

Chemistry
1. What is the molar of a sodium bicarbonate solution prepared from 150 g of NaHCO3 in 150 mL solution? 2. What mass of glucose (C6H12O6) is needed to prepare a solution of 10 M, 5 L solution? 3. What volume in liters of a 4.0 M Ca(NO3)2 is needed to provide 50 g Ca(NO3)2?
Monday, May 4, 2015 at 7:12pm

chemistry
a 12ml sample of 0.4m silver nitrate solution is mixed with 8 ml of 0.8m sodium chloride solution. determine the identity of precipitate and the number of grams produced.
Monday, May 4, 2015 at 5:03pm

CHEMISTRY
The gas sample has a volume of 76.7 μL at 22.1 °C. What is the volume of the gas after the sample is cooled to 9.8 °C at constant pressure?
Monday, May 4, 2015 at 4:37pm

Chemistry
In a dry cell, MnO2 occurs in a semisolid electrolyte paste and is reduced at the cathode. The MnO2 used in dry cells can itself be produced by an electrochemical process of which one half-reaction is shown below. Mn2+(aq) + 2 H2O(l) MnO2(s) + 4 H+(aq) + 2 e - If a current of ...
Monday, May 4, 2015 at 4:21pm

Chemistry
A concentration cell consists of two Sn/Sn2+ electrodes. The electrolyte in compartment A is 0.16 M Sn(NO3)2. The electrolyte in B is 0.86 M Sn(NO3)2. Which electrode is the cathode? What is the voltage of the cell? (Answer with two significant figures.)
Monday, May 4, 2015 at 4:20pm

Chemistry
A voltaic cell consists of an Mn/Mn2+ half-cell and a Pb/Pb2+ half-cell. Calculate [Pb2+] when [Mn2+] is 2.1 M and Ecell = 0.13 V.
Monday, May 4, 2015 at 4:19pm

Chemistry
What is the value of the equilibrium constant at 25°C for the reaction between each of the following? (a) Sn(s) and Pb2+(aq) (b) Cr(s) and Cu2+(aq) I have been unable to get either and have spent the last two hours attempting it. I have been using the equation K = 10^(...
Monday, May 4, 2015 at 3:48pm

MS SUE PLZ HELP
How does the C horizon form? Rainwater washes clay minerals from the A horizon to the C horizon Plant roots weather pieces of rock plants add organic material to the soil bedrock weathers, and breaks up into soil particles.** What makes up soil besides rock particles, minerals...
Monday, May 4, 2015 at 3:28pm

chemistry
what is the volume occupied by 2 moles of ammonia at s.t.p(1mole of gas at s.t.p=22.4)
Monday, May 4, 2015 at 2:51pm

Science
How does the C horizon form? Rainwater washes clay minerals from the A horizon to the C horizon Plant roots weather pieces of rock plants add organic material to the soil bedrock weathers, and breaks up into soil particles.** What makes up soil besides rock particles, minerals...
Monday, May 4, 2015 at 2:42pm

Chemistry
If 5.40 kcal of heat is added to 1.00 kg of water at 100C, how much steam at 100C is produced? sHOW ALL CALCULATIONS LEADING TO AN ANSWER. Q=m*Hf 5.4=m*80 m=5.40/80=0.0675kg
Monday, May 4, 2015 at 1:49pm

Chemistry
Consider the reaction: M + 2HCl ¨ MCl2 + H2 When 0.85 mol of the metal, M, reacted with an aqueous HCl solution (the HCl is in excess), the temperature of the solution rose because the reaction produced 6795 J of heat. What is ∆H in kJ per mol of M for this ...
Monday, May 4, 2015 at 1:29pm

Chemistry
a gas occupies 2 m3 at 100k and exerts a pressure of 100kpa. What volume will the gas occupy if the temperature is increased to 400.0k and the pressure is increased to 200.0kPa?
Monday, May 4, 2015 at 11:48am

chemistry
Bromine is a red liquid at 25°C. Its density is 3.12 g/mL. What is the volume of 28.1 g of liquid bromine?
Monday, May 4, 2015 at 11:25am

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

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