Saturday
May 23, 2015

Homework Help: Science: Chemistry

Recent Homework Questions About Chemistry

chemistry
how to balance this partial equation given below k2cr2o7+h2so4+kI-->k2so4+cr2(so4)3+h2​o+I2
Tuesday, May 12, 2015 at 10:52am

Chemistry
How would I find the pH of 0.25 M carbonic acid? also the pH for 0.075 M CN^-?
Tuesday, May 12, 2015 at 10:10am

Chemistry
I need to calculate the amount of NaH2PO4 (in grams) and 1.00M NaOH solution (in ml) needed to make 250 ml of 0.20M H2PO4- at pH 8.00. My work is lengthy and involved but the answer I got was 7.00 ml of the NaOH and 0.0070 moles of the NaH2PO4 needed. Can you tell me if I am ...
Tuesday, May 12, 2015 at 9:14am

Chemistry
Determine the molar solubility of Y for XY2 if Ksp is 2.2x10^-4. The 2 in Xy2 is a subscript. I found the Ksp equation which is ksp=[x^2+][Y^-]^2 Then I did the ICE table and got x and 2x for the equilibrium concentrations. Then I did: 2.2x10^-4=(x)(2x)^2 I solved for x and ...
Tuesday, May 12, 2015 at 8:58am

Chemistry
Determine Ksp if the equilibrium concentration of X is 0.02 M and Y is 0.05 M given that X2Y(s)<-->2X^+(aq)+Y^(2-)(aq). The 2 in X2Y is a subscript.
Tuesday, May 12, 2015 at 8:15am

Chemistry
I need to calculate the amount of NaH2PO4 (in grams) and 1.00M NaOH solution (in ml) needed to make 250 ml of 0.20M H2PO4- at pH 8.00. My work is lengthy and involved but the answer I got was 7.00 ml of the NaOH and 0.0070 moles of the NaH2PO4 needed. Can you tell me if I am ...
Tuesday, May 12, 2015 at 2:20am

Chemistry
Determine Qsp if 8.7 ml of 2.1 M AgNO3 is added to 1.7 ml of 1.5 M CaCl2 .The Ksp of AgCl is 1.77 x 10^-10.
Tuesday, May 12, 2015 at 12:33am

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 a new sample of iron? Show all calculations leading to a solution. Can you work the problem? I don't know how to solve for t!!! Please.
Monday, May 11, 2015 at 10:17pm

chemistry B-11
A sample of gas in a 10.0-L container exerts a pressure of 565 mm Hg. Calculate the pressure exerted by thrvgas if he volume is changed to 15.0 L at constant temperature.
Monday, May 11, 2015 at 8:41pm

Chemistry
Potassium metal reacts with water to give potassium hydroxide and hydrogen gas. If 50.0 mL of hydrogen gas is produced at STP, what is the mass of potassium that reacted? 2K(s) + 2 H2O (l) -> 2 KOH (aq) + H2(g)
Monday, May 11, 2015 at 8:20pm

Chemistry
The reaction N2(g)+3H2(g)<-->2NH3(g) begins with 1.15 M N2 and 1.36 M H2. At equilibrium the concentration of NH3 is 0.78 M. Determine the extent of reaction.
Monday, May 11, 2015 at 7:31pm

Chemistry
I dont know how to do Titration problems! I have an emergency homework assignment thats crucial to my grade! Please help with tips and step by step response! Please help!- 1. 50ml of 0.3 M KOH are required to titrate 60 ml of H^2SO^4. What is the M of the H^2SO^4? 2. 60 ml of ...
Monday, May 11, 2015 at 4:38pm

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. Is this how you would do this? Q= m*Hvap Q= m* 5.40 Q=100*5.40 Steam = 540 kg of steam?
Monday, May 11, 2015 at 2:04pm

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. Is this how you would do this? (100/25) = 0.693 times (45.1) 4= 31.2543 final answer is 7.8136
Monday, May 11, 2015 at 2:00pm

chemistry 20
A student mixed a solution of aqueous calcium chloride with an aqueous solution of magnesium sulphate. A precipitate formed. 1) Write the balance chemical equation for the reaction including states of matter. Ensure you write the reactants as a dissociated ions. 2) Based on ...
Monday, May 11, 2015 at 1:55pm

Chemistry 20
Hydrogen cyanide gas is produced industrially by the reaction 2 CH4(g) + 3 O2(g) + 2 NH3(g) → 2 HCN(g) + 6 H2O(g) What volume of O2(g) is needed to completely react 17 L of CH4(g) at STP?
Monday, May 11, 2015 at 1:21pm

chemistry
A radioactive nucleus alpha decays to yield a sodium-24 nucleus in 14.8 hours. What was the identity of the original nucleus? Show the nuclear equation that leads you to this answer. 13 X 28 --> 11 Na 24 + 2 He 4 look at the periodic table for atomic number 13 --- that is ...
Monday, May 11, 2015 at 12:19pm

chemistry
Can methane and oxygen be separated. If yes, can anyone please mention the method
Monday, May 11, 2015 at 10:16am

chemistry
You are operating an X-ray tube with a molybdenum (Mo) target by applying an acceleration potential of 50 keV. Calculate the values of two characteristic wavelengths, λKα and λSWL. Express your answers in meters.
Sunday, May 10, 2015 at 11:22pm

chemistry
The charge carrier concentration of GaAs at 100oC is 1.048*1011 cm-3. The charge carrier concentration at 280°C is 1.841*1017 cm-3. What is the bandgap of GaAs? Give answer in eV.
Sunday, May 10, 2015 at 11:17pm

chemistry
A current of 8.959 milliamps (10-3 A) is measured flowing through a tungsten wire of diameter 0.1 mm and 9 cm long when 1.7 mV is applied. What is the resistivity of tungsten? Express your answer in ohm-m.
Sunday, May 10, 2015 at 11:16pm

Chemistry
I need to figure out whether NaNO3 is saturated, unsaturated, or supersaturated in a 3 molal solution at 40 degrees Celsius. I am completely stuck right now, and am not sure where to go with this.
Sunday, May 10, 2015 at 11:14pm

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?
Sunday, May 10, 2015 at 11:11pm

Organic Chemistry
any o-chemists out there? Some help would be greatly appreciated. So I have this compound, it has 5 C's total, a bromine at one end and 2 methyl groups coming off the 3rd C from the bromine and an OH group at the end. like this: Br-CH2-CH(CH3)2-CH2OH. Now I have to come up...
Sunday, May 10, 2015 at 10:57pm

Chemistry
How do I calculate the molality of a saturated solution of KCl at 70 degrees Celsius? I have gotten the moles of KCl (.66) but am not sure where to go from there.
Sunday, May 10, 2015 at 10:35pm

chemistry
What salt results from the neutralization of phosphoric acid with potassium hydroxide? Would you set up an equation here?
Sunday, May 10, 2015 at 9:17pm

chemistry
what is the solubility in grams of KCL3(s) per 100 ml of water?
Sunday, May 10, 2015 at 9:11pm

chemistry
calculate the solubility in grams of KCL3(s) per 100 ml of water
Sunday, May 10, 2015 at 9:07pm

Chemistry
A 94 mL vanillin solution with a concentration of 0.017 mol L-1 was made by extraction from 24.41 g of vanilla pods. Calculate the percentage of vanillin in the vanilla pods. It would be helpful if you could explain to me the process to work out this question instead of just ...
Sunday, May 10, 2015 at 8:20pm

Chemistry (Acids and Bases)
What is the pH of a 0.400 molar HCl solution? I did -log(.4)=.398. That seems too low. I think I need to find the molarity (M) of the solution, but I can't find it with the given information.
Sunday, May 10, 2015 at 6:20pm

chemistry
estimate the boiling point of Pcl3
Sunday, May 10, 2015 at 6:01pm

chemistry dont know how to do it
dG for the formation of Hi(g) from its gaseous elements is -20.2 kj/mol at 500k. when the partial pressure of HI is 10 atm, and I2 0.001 atm, what must the partial pressure of hydrogen be at this temperature to reduce the magnitude of dG for the reaction to 0. H2(g)+I2(g)----&...
Sunday, May 10, 2015 at 5:51pm

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. I am really confused on how to find t here? Can someone help? I can set up the rest of the equation
Sunday, May 10, 2015 at 5:17pm

Chemistry
My teacher is an idiot and wont teach our class and im panicking so please help anyone. Given the following equations enthalpy values, determine the heat of reaction (kj) at 298k for the reaction: B2H6(g)+6Cl(g)=2BCl3(g)+6HCl(g)
Sunday, May 10, 2015 at 4:37pm

chemistry
Higher to noise ratios can be achieved in FTIR spectra compared to spectra from dispersive IR instruments. How is such a useful feat achieved in FTIR
Sunday, May 10, 2015 at 2:15pm

analytical chemistry
DrBob222, it is me again. Continue the question 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, ...
Sunday, May 10, 2015 at 2:13pm

chemistry
In generating the synchronous spectrum, it is not necessary to specify the wavelength range, why?
Sunday, May 10, 2015 at 2:09pm

Chemistry
A mixture of powdered carbon and an oxide of lead was heated producing lead metal and carbon dioxide.when 13.70g of the lead oxide was reduced to lead by carbon,960cm^3 of carbon dioxide measured at r.t.p was formed. Calculate the empirical formular of the lead oxide???
Sunday, May 10, 2015 at 12:52pm

Chemistry
A student was asked to prepare a sample of copper(ii)sulphate crystals(CUSO4.5H2O) given 5g of of copper (ii)oxide (CUO) as the starting material.if 10g of dry crystals of CUSO4.5H2O were obtained,calculate the percentage yield???
Sunday, May 10, 2015 at 11:03am

chemistry
describe the detector used to acquire UV-Vis Spectra in the entire UV-Visible spectral range at the same instant (ie. not sequential scanning of wavelengths) HELP PLEASE It is due monday :((
Sunday, May 10, 2015 at 3:45am

Chemistry
A Balanced equation to represent the reaction between 1-pentanol and ethanoic acid. (Production of an ester)
Sunday, May 10, 2015 at 3:24am

ap chemistry
is this positive or negative entropy? devitrication of glass desalination of water hard of boiling of a egg
Saturday, May 9, 2015 at 11:19pm

chemistry
Hydrochloric acid(75.0 ml of 0.250 M) is added to 225.0 ml of 0.0550 M Barium hydroxide solution. What is the concentration of the excess H+ or OH- ions left in this solution?
Saturday, May 9, 2015 at 8:37pm

chemistry
under what conditions could the decomposition of Ag2O(s) into Ag(s) and O2(g) proceed spontaneously at 298 K? 2Ag2O(s)---->4Ag(s)+O2(g) dG=22.42 Kj answer= 0.000118 atm.
Saturday, May 9, 2015 at 8:25pm

chemistry
dG for the formation of Hi(g) from its gaseous elements is -20.2 kj/mol at 500k. when the partial pressure of HI is 10 atm, and I2 0.001 atm, what must the partial pressure of hydrogen be at this temperature to reduce the magnitude of dG for the reaction to 0. H2(g)+I2(g)----&...
Saturday, May 9, 2015 at 8:22pm

Chemistry - Acids/Bases
What kinds of compounds are typically strong bases? (More than one may apply.) *hydroxides of group IIIA (13) metals *conjugate bases of strong acids *hydroxides of group IA (1) metals *hydroxides of transition metals *hydroxides of group IIA (2) metals All I know about strong...
Saturday, May 9, 2015 at 6:01pm

chemistry
How much heat energy, in kilojoules, is required to convert 37.0g of ice at −18.0 ∘C to water at 25.0 ∘C ?
Saturday, May 9, 2015 at 5:11pm

college chemistry
at its melting point, O c, the enthalpy of fusion of water is 1.435 kcal/mol. what is the molar entropy change for the melting ice at 0C? answer: 5.26 cal/mol-k
Saturday, May 9, 2015 at 1:06pm

college chemistry
for the reaction at 298 K 2A+b ---->C enthalpy=100 K/cal entropy= 0.050 kcal/k assuming enthalpy and entropy to be constant over the temperature range, at what temperature will the reaction become spontaneous? answer: T>2000K
Saturday, May 9, 2015 at 1:05pm

college chemistry
estimate the normal boiling point of Pcl3 answer: 333 K how do you get it?
Saturday, May 9, 2015 at 1:02pm

chemistry
how to make a buffer with 25 drops of 1.0 M acetic acid and 10 to 25 drops of sodium acetate
Saturday, May 9, 2015 at 10:22am

Chemistry
Use Henry's law and the solubilities given below to calculate the total volume of nitrogen and oxygen gas that should bubble out of 1.5L of water upon warming from 25C to 50C . Assume that the water is initially saturated with nitrogen and oxygen gas at 25C and a total ...
Saturday, May 9, 2015 at 12:27am

Analytical Chemistry
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 excitation spectrum and and ...
Friday, May 8, 2015 at 11:18pm

Pre-Ap Chemistry
This is my last question and this one really threw me for a loop. I know that the temp has to be converted to kelvin which would make it 315.4 What volume of oxygen gas can be collected at 0.683 atm pressure and 34.0◦C when 42.4g of KClO3 decompose by heating, according ...
Friday, May 8, 2015 at 10:39pm

Pre-Ap Chemistry
This is due online in 20 minutes and I've been working on it for 3 hours. Im lost on what to do with this question. Please help How much H2 gas at STP can be produced by the reaction 2Na(s) + 2H2O(§¤) -> H2(g) + 2NaOH(aq) of 3.80 g of Na and excess water? ...
Friday, May 8, 2015 at 10:36pm

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 at 9:05pm

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 at 8:50pm

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 at 8:40pm

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 at 8:39pm

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 at 8:16pm

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 at 5:40pm

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 at 3:57pm

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 at 3:20pm

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 at 3:06pm

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 at 2:49pm

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 at 2:44pm

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 at 1:29pm

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 at 1:02pm

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 at 10:14am

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 at 6:45pm

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 at 5:44pm

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 at 4:16pm

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 at 4:09pm

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 at 3:48pm

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 at 2:24pm

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 at 1:35pm

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 at 8:38am

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 at 8:30am

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 at 11:53pm

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 at 10:56pm

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 at 10:30pm

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 at 9:53pm

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 at 8:55pm

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 at 8:53pm

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 at 8:41pm

chemistry
why does the neutrality in the blood depends on the concentrations of [H+] and [OH-] rather than pH.
Wednesday, May 6, 2015 at 8:08pm

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 at 7:59pm

chemistry
20 g NaOH are dissolved in 1 L H2O. What is the N of the NaOH solution
Wednesday, May 6, 2015 at 7:50pm

chemistry
20 g NaOH are dissolved in 1 L H2O. What is the N of the NaOH solution?
Wednesday, May 6, 2015 at 7:42pm

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 at 6:42pm

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 at 6:37pm

chemistry
What is the oxidation number of chlorine in Al(ClO4)3?
Wednesday, May 6, 2015 at 5:15pm

chemistry
how many ml of nitric acid will neutrilize 20 ml of KOH at .5 moles
Wednesday, May 6, 2015 at 5:03pm

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 at 4:56pm

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 at 4:53pm

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 at 1:58pm

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 at 1:23pm

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 at 1:08pm

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 at 12:04pm

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 at 11:57am

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