Tuesday
July 7, 2015

Homework Help: Science: Chemistry

Recent Homework Questions About Chemistry

chemistry
The rate constant for the following equation is 0.00454 M−1 · s −1 . We start with 0.134 mol C2F4 in a 4 liter container, with no C4F8 initially present. 2 C2F4 → C4F8 What will be the concentration of C2F4 after 2 hours? Answer in units of M.
Friday, May 8, 2015 by Anonymous

chemistry
How much of a 6.0M sucrose solution should you use to make 77.0mL of a 0.055M solution?
Friday, May 8, 2015 by joe

CHEMISTRY
Nitric acid can be produced by the reaction of gaseous nitrogen dioxide with water. 3NO2(g) + H2O(§¤) −> 2HNO3(§¤) + NO(g) If 794 L of NO2 gas react with water, what volume of NO gas will be produced? Assume the gases are measured under the ...
Friday, May 8, 2015 by Morgan

Chemistry
What is the pH, pOH, [H+] and [OH-] for a solution that contains 5.25 x 10^-3 moles of HCl dissolved in 3.25 L of water? I was gone the day my teacher explained this and I'm completely lost on what to do. An outline of steps needed to solve the problem would be helpful. ...
Friday, May 8, 2015 by Joey

Chemistry Help, Please!!!
The Kw of water varies with temperature. Calculate the pH of water at 46℃ with a Kw=1.219 x 10 to the negative 14th.
Friday, May 8, 2015 by Gloria

chemistry
The amount of organic carbon in a sample can be obtained by IR analysis of the carbon dioxide (CO2) released following complete combustion of the sample in oxygen. A reference sample of an organic compound is usually used to calibrate the instrument response. In an analysis of...
Friday, May 8, 2015 by adam

chemistry
From the fringe pattern of an empty Ir cell, the following wavenumbers were found for a seies of consecutive fringes: 3011.11 cm, 3058.12 cm, 3108.89 cm, and 3157.75cm, 3205.64cm, 3254.54 cm, 3303.26 cm. With a suitable graphical plot, calculate and express the answer to the ...
Friday, May 8, 2015 by Sakura

chemistry
Higher signal to noise signal ratios can be achieved in FTIR spectra compared to spectra from dispersive ir instrument. how is such a useful feat achieved in ftir
Friday, May 8, 2015 by Ben

analytical chemistry
Any help is greatly appreciated 5mL of a solution A (unknown concentration) was transferred into sic 25mL volumetric flask. The following volumes of a standard solution of A with with a concentration 75ppm were added to the flask: 0mL, 0.5mL, 1mL, 1.5mL, 2mL, and 2.5L. The ...
Friday, May 8, 2015 by Katy

Chemistry
The following unbalanced equation describes the reaction that can occur when (II) sulfide reacts with oxygen gas to produce lead (Il) oxide and sulfur dioxide gas: PbS+O2---> PbO + SO2 Balance the equation and describe in words the electron transfers that takes place.
Friday, May 8, 2015 by Gloria

Chemistry
Iron -59 has a half -life of 45.1 days. How old is an iron nail if the Fe-59 content is 25% that of a new sample of iron? Show all calculations leading to a solution.
Friday, May 8, 2015 by Gloria

chemistry
Balance the following reactions using the non-traditional method of balancing redox Nickel(II) hydroxide + oxygen = Nickel(III) hydroxide Copper(I) hydroxide + oxygen = Copper(II) hydroxide
Friday, May 8, 2015 by Nicole

Chemistry
How much water must be added to make 500 ml of 12.0 M HCl to 1.0 M HCl (500mL• 12M) / 1.0M =6000m Is this correct?
Friday, May 8, 2015 by Carl

chemistry
sketch a graph to show the melting curve for water as it goes from -25.0C to 110.0C. Use temperature on y-axis and time on your x-axis
Friday, May 8, 2015 by Anonymous

chemistry
when calcium carbonate, caco3(s) is heated, it decomposes to form calcium oxide, cao(s) and carbon dioxide gas. how many liters of carbon dioxide will be produced at stp if 2.38 kg of calcium carbonate reacts completely?
Thursday, May 7, 2015 by Anonymous

chemistry
What mass of solute is contained in 250 mL of 0.895 M NH4Cl? I think that this is a molarity question. Molarity = mass of solute/volume of solution in L. 1 mL = 0.001 L so 250 mL * 0.001 L = 0.25 L 0.895 M = X (mass of solute)/ 0.25 but since the answer is to be in grams, I ...
Thursday, May 7, 2015 by Danny

Chemistry
A scuba diver 60ft below the ocean’s surface inhales 50.0 mL of compressed air from a scuba tank with an initial pressure of 3.00 atm and temp of 8 degrees Celsius. What is final pressure, in atmospheres, in the lungs when the gas expands to 150.0 mL at a body temp of 37 ...
Thursday, May 7, 2015 by Nastasha

Chemistry
A sample of argon gas has a volume of 735 mL at a pressure of 1.20 atm and a temp of 112 degrees Celsius. What is the final volume of the gas, in milliliters, when the pressure and temp of the gas is changed to A.) 658 mmHg and 281K? B.) 0.55 atm and 75 degrees C C.)15. 4 atm ...
Thursday, May 7, 2015 by Nastasha

chemistry
A particular brand of toothpaste claims to contain 0.24 wt% sodium fluoride. What mass in grams of fluoride ion would be present in the average amount of toothpaste used to brush one's teeth, about two grams? Now this is a weight percent concentration question, I know that...
Thursday, May 7, 2015 by frank

chemistry help meee
okay so I'm given a graph of a melting profile of a macromolecule, it is a sigmoid "s" curve, which states that a protein is cooperative. I have four choices on what the graph will look like if it is uncooperative. 1) Graph 1- straight line with + slope 2) Graph ...
Thursday, May 7, 2015 by paul

Chemistry
At 28.4 g sample of aluminum is heated to 39.4 degrees Celsius and then is placed in a calorimeter containing 50.0g of water. Temp of water increases from 21.00 degrees Celsius to 23.00 degrees Celsius. What is the specific heat of aluminum?
Thursday, May 7, 2015 by Tori

Chemistry
At a deep-sea station 200.m below the surface of the Pacific Ocean, workers live in a highlypressurized environment. How much gas at STP must be compressed on the surface to fill the underwater environment with 1 × 107 L of gas at 16 atm? Assume that temperatureremains ...
Thursday, May 7, 2015 by teresa

Chemistry
A sample of nitrogen gas is collected overwater at a temperature of 23◦C. What is the pressure of the nitrogen gas if the atmospheric pressure is 744 mmHg? Answer in units of mmHg. Not sure of formula for this
Thursday, May 7, 2015 by teresa

chemistry
true or false Entropy always tend to favor mixing Mixing result in positive change in entropy Entropy allows endothermic processes to be spontaneous Pure liquids don't have entropy Addition of salt to water increases entropy Entropy is the measure of number of possible ...
Wednesday, May 6, 2015 by Jazz

Chemistry
the equilibrium constant Kc for the reaction H2 + Co2 to H2O + CO is 4.2 t 1650°C initially .80 mol of H2 and 0.8 mol Co2 are injected into a 5.0 flask. Calculate the concentration of each species at equilibrium
Wednesday, May 6, 2015 by Tintin

Chemistry
Zn + 2 HCl = H2 + ZnCl2 / When 25.0 g of Zn reacts, how many L of H2 gas are formed at 25 degrees Celsius and a pressure of 854 mmHg?
Wednesday, May 6, 2015 by Anonymous

General Chemistry 132
When solid NH4NO3 is dissolved in water at 25celcius, the temp of the solution decreases. What is true about the signs of enthalpy and entropy for this process? I understand entropy is positive, however, i do no understand why enthalpy is also positive. Can someone please ...
Wednesday, May 6, 2015 by Robert

Chemistry
A chemist needs to prepare a buffer solution of pH 8.80. What molarity of NH3 (pKb = 4.75) is required to produce the buffer solution if the (NH4)2SO4 in the solution is 1.8 M?
Wednesday, May 6, 2015 by Cortney

chemistry
Suppose you add 2.0 mL of 0.10 M HCl to 100 ml of buffer having 0.10 M HA and 0.20 M NaA. a. Which species will react strongly with one another? I believe the answer is Cl- and Na+ to form NaCl. b. What will be the change in pH? pKa = 4.82 I am not sure how to find the answer ...
Wednesday, May 6, 2015 by Cortney

Chemistry
A solution is prepared by titrating a 100.0 mL sample of 0.10 M HF (Ka = 7.2 × 10-4) with 0.10 M NaOH.What is the pH after 20.0 mL of the 0.10 M NaOH is added?
Wednesday, May 6, 2015 by Cortney

chemistry
why does the neutrality in the blood depends on the concentrations of [H+] and [OH-] rather than pH.
Wednesday, May 6, 2015 by Cortney

chemistry
select one acid, one base, and one salt and describe specifically how and where they are used in therapeutic processes.
Wednesday, May 6, 2015 by bob

chemistry
20 g NaOH are dissolved in 1 L H2O. What is the N of the NaOH solution
Wednesday, May 6, 2015 by nicole

chemistry
20 g NaOH are dissolved in 1 L H2O. What is the N of the NaOH solution?
Wednesday, May 6, 2015 by Anonymous

College Chemistry
Arrange the following compounds in the order of increasing Ksp: AgCl, AgBr, AgI. Explain your reasoning. I got AgI<AgBr<AgCl but I looked at the actual Ksp. I do not know how else to explain it besides looking at the Ksp. Like is there any way I can just know which one ...
Wednesday, May 6, 2015 by Anissa

College Chemistry
Calculate the unknown of Ag+ if the potential of the following concentration cell is 300 mV at 25.0 C. Ag|Ag+(unknown)||Ag+(0.100M)|Ag I think I have to use Nernst Equation of Ecell=E0-.0592/nlogQ And at 25C is at 298K so i don't have to change anything. I am not sure if i...
Wednesday, May 6, 2015 by Samantha

chemistry
What is the oxidation number of chlorine in Al(ClO4)3?
Wednesday, May 6, 2015 by Student101

chemistry
how many ml of nitric acid will neutrilize 20 ml of KOH at .5 moles
Wednesday, May 6, 2015 by Kimmy

Chemistry
If 5.40 kcal of heat is added to 1.00 kg of water at 100⁰C, how much steam at 100⁰C is produced? Show all calculations leading to an answer.
Wednesday, May 6, 2015 by Student101

Chemistry
If the solubility of Ag2CO3 is 1.3×10^-4 mol/L what is the Ksp? I'm trying to do it but my answer I keep on getting is wrong and doesn't match the text book which is 8.8×10^-12
Wednesday, May 6, 2015 by Fay

Chemistry
If 0.176 g of pure sodium hydroxide was dissolved in water and the solution titrated with 5.05 mL of hydrochloric acid solution to a phenolphthalein end point, calculate each of the following of the hydrochloric acid solution. (a) the molarity = .871 (b) the percent by mass (...
Wednesday, May 6, 2015 by Kyle

Chemistry
10.6gram of hydrated zinc tetraoxosulphate (vi) on heating to constant mass gave 5.95g of the anhydrous form.Calculate the number of molecules(x) of water of crystalization in the hydrated salt.(zn=65,s=32,o=16,h=1)
Wednesday, May 6, 2015 by Ashlyn

chemistry
Referring to the following reaction: Pb(NO3)2 (aq) + Na2SO4 (aq) -->PbSO4 (s) + 2NaNO3 (aq) A solution of 0.114 M Pb(NO3)2 with a volume 10.6 mL is added to 12.4 mL of a solution of 0.105 M Na2SO4. Calculate the number of grams of PbSO4 that will form. I already checked out...
Wednesday, May 6, 2015 by Mona

Chemistry
Use the equation below to answer the following question. How many grams of calcium chloride are produced from 19.3 g of HCl? 2HCl + Ca(OH)2 à 2H2O + CaCl2 Give your answer in correct sig digs and correct label.
Wednesday, May 6, 2015 by Anonymous

chemistry
Calculate the concentration of all species in a 0.130M solution of H2CO3 Enter your answers numerically separated by commas. Express your answer using two significant figures. [H2CO3], [HCO?3], [CO2?3], [H3O+], [OH?] =
Wednesday, May 6, 2015 by kales

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 by teresa

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 by Jared

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 by rishikanta rathore

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 by Anonymous

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 by Steeve

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 by Arnel Comia

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 by Jack

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 by Sam

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 by Mel

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 by lawerence

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 by Ali

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 by lawerence

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 by lawerence

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 by Maya

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 by Nicole

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 by mel

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 by Venice

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 by clive

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

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 by clive

chemistry
what is a mole
Tuesday, May 5, 2015 by Bob

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 by Reeseamelia

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 by bobby

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 by Need Help Urgent

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 by Heather

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 by Nick

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 by Anonymous

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 by Anonymous

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 by torri

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 by Anusha

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 by Carter

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 by Alex

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 by Caroline

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 by Levi Ackerman

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 by henry

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 by Levi Ackerman

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 by Gloria

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 by Jessica

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 by Tony

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 by bobby

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 by clive

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 by Steeve

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 by Anonymous

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 by josh

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 by No name

Chemistry
would you classify 2C(s) + H2(g) ---> C2H2(g) +227.4 as endothermic or exothermic? Why?
Sunday, May 3, 2015 by No Name

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 by allie

chemistry
how many grams of potassium carbonate are in 75.0ml of a 2.44M solution?
Sunday, May 3, 2015 by elmi

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 by alexis

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 by Bridget

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 by alexis

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 by Gabby

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 by Frank

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 by Miranda

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 by Anne

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