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February 27, 2015

Homework Help: Science: Chemistry

Recent Homework Questions About Chemistry

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Chemistry
What volume of oxygen gas at 20.9 c and 750 torr is needed to burn 3.00 liters of propane, C3H8 at the same temprrature and pressure? I know i use V1/n1=V2/n2, but how do i get n?
Tuesday, December 2, 2014 at 8:16pm

Chemistry
The concentration of fluoride ions in a saturated solution of barium fluoride is __________ M. The solubility product constant of BaF2 is ???
Tuesday, December 2, 2014 at 7:24pm

Chemistry
Consider the following reaction, equilibrium concentrations, and equilibrium constant at a particular temperature. Determine the equilibrium concentration of H2O(g). C2H4(g) + H2O(g) C2H5OH(g) Kc = 9.0 × 103 [C2H4]eq = 0.015 M [C2H5OH]eq = 1.69 M
Tuesday, December 2, 2014 at 7:16pm

Chemistry
Calculate the solubility (in g/L) of calcium fluoride in water at 25°C if the Ksp for is 1.5 × 10-10 .
Tuesday, December 2, 2014 at 7:13pm

Chemistry
Kc is 1.67 × 1020 at 25°C for the formation of iron(III) oxalate complex ion: Fe3+(aq) + 3 C2O42-(aq) [Fe(C2O4)3]3-(aq). If 0.0200 M Fe3+ is initially mixed with 1.00 M oxalate ion, what is the concentration of Fe3+ ion at equilibrium?
Tuesday, December 2, 2014 at 7:05pm

Chemistry
The equilibrium constant, Kp, equals 3.40 for the isomerization reaction: cis-2-butene trans-2-butene. If a flask initially contains 0.250 atm of cis-2-butene and 0.145 atm of trans-2-butene, what is the equilibrium pressure of each gas?
Tuesday, December 2, 2014 at 6:54pm

Chemistry
The aquation of tris(1,10-phenanthroline)iron(II) in acid solution takes place according to the equation: Fe(phen)32++ 3 H3O++ 3 H2O →Fe(H2O)62++ 3 phenH+. If the activation energy, Ea, is 126 kJ/mol and the rate constant at 30°C is 9.8 × 10-3 min-1, what is ...
Tuesday, December 2, 2014 at 6:54pm

Chemistry
For which of these elements would the first ionization energy of the atom be higher than that of the diatomic molecule? helium oxygen carbon lithium Please explain why and thanks
Tuesday, December 2, 2014 at 6:22pm

chemistry
A piece of an aluminum can was cut into small pieces. Then 0.422 g of the chips from the can was used to prepare potassium alum according to the procedure we used. Calculate the theoretical yield (in g) of potassium alum that could be obtained in the reaction. (Alum MW=474.41 ...
Tuesday, December 2, 2014 at 4:33pm

chemistry
What is the pressure of 5 pounds of Argon gas in a 25 liter bottle at 23 degrees Celsius?
Tuesday, December 2, 2014 at 4:30pm

Chemistry
Barium-122 has a half-life of 2 minutes. If 10.0 g of Ba-122 are produced in a nuclear reactor how much Ba-122 will remain 10 minutes after production ceases? Question 11 options: 2.50 g 1.25 g 0.625 g 0.313 g
Tuesday, December 2, 2014 at 3:32pm

chemistry
The half-life of I-131 is 8.00 days. If a medical treatment involves a dose of 400. mg of I-131, how much of the isotope remains after 48 days? 3.125 mg 6.25 mg 12.5 mg 25 mg
Tuesday, December 2, 2014 at 3:30pm

Chemistry
carbon dioxide has a henrys law constant of 3.4E-2 mol/l*atm what is the molar concentration of CO2 in water if the partial pressure of CO2 in air is .000387. i know i have to use S=Kh*P but that gives you soluability where do i go from here to find molar concentration of CO2 ...
Tuesday, December 2, 2014 at 2:59pm

Chemistry
26.98 grams of Al and 35.45 grams of Cl2 are reacted according to the equation 2Al + 3Cl2 → 2AlCl3 How many grams of AlCl3 will be formed assuming 100% yield? it says the answer is supposed to be 26.98g but cannot seem to reach that. I just want to know how to get there.
Tuesday, December 2, 2014 at 2:38pm

Chemistry
A reaction requires 0.5 g of pure methyl oleate (density = 0.87g/mL) (MW = 310g/mol). How many mL of 70% pure methyl oleate are needed for the reaction. I don't exactly know how to start this off. I think what I'm supposed to do is multiply the 70% by the molecular ...
Tuesday, December 2, 2014 at 2:10pm

Chemistry
The molar mass of glucose is 180.16g/mol A. How much glucose is needed to make 500 ml of a .44M (.44mol/1L) solution? .44M/L=180.16x.44/100ml=79.27/1000=.0792​7x500=39.64g/mol/550ml? B What volume of the .44M solution is needed to prepare 1L of a 5% glucose solution? Don...
Tuesday, December 2, 2014 at 1:36pm

Chemistry Problem
Diiodine pentafluoride reacts spectacularly with bromine trifluoride to form iodine pentafluoride, oxygen gas, and liquid bromine. In a particular reaction a 44.00g sample of I2O5 reacts with 58.00g BrF3. What is the mass of the excess reagent? This is what I have so far: ...
Tuesday, December 2, 2014 at 11:44am

chemistry
does any solid pbcl2 form when 3.5mgNacl is dissolved in 0.250L of 0.12M of lead nitrate?
Tuesday, December 2, 2014 at 10:58am

chemistry
what wil be the molarity if it increases from 20 c to 100 c?
Tuesday, December 2, 2014 at 10:08am

Chemistry
How many moles of atoms are contained in 5.60 grams of Sulfur? Can someone help me understand how to work out other problems like these as well? Thank you!!
Tuesday, December 2, 2014 at 9:59am

Chemistry
Given cell Cd | CdCl2 (0.55M) || NaBrO3 (0.34M), NaBr (0.12M), pH=1.20 | Pt 1. How many electrons are transferred? 2. What is E° for the cell? 3. What is E for the cell?
Tuesday, December 2, 2014 at 12:45am

Chemistry
It takes 476 kJ to remove 1 mole of electrons from the atoms at the surface of a solid metal. how much energy (in kJ) does it take ti remove a single electron from an atom at the surface of this solid metal?
Tuesday, December 2, 2014 at 12:11am

chemistry
Although no currently known elements contain electron in g orbitals in the ground state, it is possible that these elements will be found or that electrons in excited states or known elements could be in g orbitals. For g orbitals, the value of L(lowercase) is 4. What is the ...
Monday, December 1, 2014 at 11:47pm

Chemistry
A student weighs out 15g of the hydrated salt KCl (this is KCl and water) and heats it till a constant mass of 12 grams remains. What percent of the salt was water?
Monday, December 1, 2014 at 11:27pm

Chemistry
What is molarity of an HCl sloution if 45.0mL of 0.250 mol/L KOH are needed to neutalize 12.3mL of HCl?
Monday, December 1, 2014 at 11:26pm

Chemistry
To a mixture of NaCl and Na2CO3 with a mass of 1.300 g was added 55.00 mL of 0.243 M HCl (an excess of HCl). The mixture was warmed to expel all of the CO2 and then the unreacted HCl was titrated with 0.100 M NaOH. The titration required 7.40 mL of the NaOH solution. What was ...
Monday, December 1, 2014 at 11:02pm

CHEMISTRY
What is the pH of a solution with [H3O+] = 1 x 10-9 M? My answer is pH=9. is that correct
Monday, December 1, 2014 at 10:35pm

Chemistry
An electron is excited from the n=1 ground state to the n=3 state in a hydrogen atom. Which of the following statements are true? Correct the false statements to make them true. A. It takes more energy to ionize (completely remove) the electron from n=3 than from the ground ...
Monday, December 1, 2014 at 10:00pm

chemistry
The decomposition of potassium chlorate (KClO3) is used as a source of oxygen in the laboratory. How much potassium chlorate is needed to produce 10.2 mol of oxygen? Answer in units of mol
Monday, December 1, 2014 at 9:49pm

CHEMISTRY
The [OH1-] with a pH of 5 is
Monday, December 1, 2014 at 9:31pm

Chemistry
Identify the Bronsted-Lowry acid in the following reaction. H2O (l) + HCO31- (aq) → H3O+ (aq) + CO32- (aq)
Monday, December 1, 2014 at 9:23pm

Chemistry
I'm not sure how to set this question up... A solution containing 0.015M Sr^2+ and Ba^2+ ions is treated with Na2SO4 and a percipitate containing one metal sulfate forms. Assition of the sulfate ion continues until the more soluble sulfate salt just begins to percipitate. ...
Monday, December 1, 2014 at 9:12pm

AP Chemistry
For the reaction ?CH4+ ?O2 ==> ?CO2+ ?H2O, what is the maximum amount of CO2 (44.0095 g/mol) which could be formed from 3.67 g of CH4 (16.0425 g/mol) and 4.23 g of O2 (31.9988 g/mol)? Answer in units of g I know that you have to balance the equation, so the coefficients 1, ...
Monday, December 1, 2014 at 9:04pm

chemistry
A solution with a pH of 7 has a [OH1-] of
Monday, December 1, 2014 at 9:01pm

Chemistry
what is the molar concentration of h2so4 solution is 2.0ml of which is completely neutralized by 45.0ml of 0.115 mol/L NaOH solution?
Monday, December 1, 2014 at 8:57pm

chemistry
How many milliliters of an aqueous solution of 0.165 M aluminum chloride is needed to obtain 13.2 grams of the salt?
Monday, December 1, 2014 at 8:54pm

Chemistry
The homework question is : Calculate the Delta H for the following reaction: C6H6 + O2 -> C + H2O(l) State whether the reaction is exothermic or endothermic. I'm not sure where to go with this but so far I balanced out the formula to this C6H6 + (3/2)O2 -> 6C2 + 3H2O...
Monday, December 1, 2014 at 8:23pm

chemistry
What mass of solute is present in each aqueous solution? 40 mL of 6.0 mol/L, H2SO4, solution Soo I did: C=n/V 40 mL= 0.04 L C= 6.0 mol/L/0.04 L = 150 mol/L MH2SO4= 2.02 g/mol + 32.07 g/mol + 64 g/mol= 98.09 g/mol mass H2SO4= 150 mol x (98.09g/1 mol) = 14713.5g =1.47 x 10^4 Is ...
Monday, December 1, 2014 at 8:10pm

Chemistry
A student dissolves 22.4 g of sodium phosphate to prepare a 2.98 L solution. Another student then dilutes this solution to 4.90 L. If sodium phosphate completely dissociates, determine the number of mols of each ion in the final solution.
Monday, December 1, 2014 at 7:44pm

chemistry
A mixture of 94.6g of O2 and 82.2g of Ne is placed in a 200.0L container at 250K . What is the partial pressure of O2 in atmospheres?
Monday, December 1, 2014 at 7:39pm

Chemistry
i need help on a lab here are the results Mass of empty beaker and glass rod(62.62) Mass of beaker, glass rod, hydrated copper sulfate(66.02) Mass of beaker, glass rod and anhydrous copper sulfate(65.04) Mass of hydrated copper sulfate(3.4) Mass of anhydrous copper sulfate(2....
Monday, December 1, 2014 at 7:24pm

PLEASE HELP CHEMISTRY
CuSO4.xH2O Determine the percent by mass of water in your sample of hydrated copper (II) sulfate. Show your calculations clearly. My work. i got 10% is that correct
Monday, December 1, 2014 at 6:50pm

Chemistry
CuSO4.xH2O Determine the percent by mass of water in your sample of hydrated copper (II) sulfate. Show your calculations clearly. My work. i got 10% is that correct
Monday, December 1, 2014 at 6:21pm

chemistry
In the following reaction, how many grams of lead(II) nitrate Pb(NO3)2 will produce 425 grams of sodium nitrate (NaNO3)? Pb(NO3)2(aq) + 2 NaBr(aq) PbBr2(s) + 2 NaNO3(aq) The molar mass of Pb(NO3)2 is 331.21 grams and that of NaNO3 is 85 grams.
Monday, December 1, 2014 at 5:43pm

chemistry
Democritus- example and picture is it an atom and a picture of a atoms that she wants?? Did he rely on experimental evidence to justify his ideas? yes he gave an image of an atom that distinguished them from each other by their shape, size, and the arrangement of their parts
Monday, December 1, 2014 at 4:57pm

chemistry
Determine the percent by mass of water in your sample of hydrated copper (II) sulfate - CuSO4. xH2O My work I got 10% is this correct?
Monday, December 1, 2014 at 4:53pm

Chemistry
A 100.0 mL sample of a 0.200 molar aqueous solution of K2CrO4 was added to 100.0 mL of a 0.100 molar aqueous solution of BaCl2. The mixture was stirred and the precipitate was collected, dried carefully, and weighed. How many grams of precipitate should be obtained? The ...
Monday, December 1, 2014 at 4:50pm

chemistry
Version A formular: 3Zn(OH)2 + 2Zn(CO)3(s)-----------------------------​>5ZnO(s)+2CO2(g) +3H2O(g) 105.4mL of Co2(g) was generated with a pressure of 765.5mm Hg for the gas. The temperature of the apparatus was 25.0C. How much zinc oxide would be left in tube if ...
Monday, December 1, 2014 at 2:23pm

Chemistry
Chemistrywhat is the weight of 1 atom of H in gram (at.wt Of h = 1.008) ?
Monday, December 1, 2014 at 1:23pm

Chemistry
Calculate the pH of the solution that is prepared by mixing 26.06g of ammonium iodide (MM=144.942) and 5.08g of ammonia (MM=17.034g) in enough 0.066 M HCI to produce 1.00L of solution. Kb(NH3)=1.76x10^-5 I converted 24.06g and 5.08g to moles and i now I have to set up an ice ...
Monday, December 1, 2014 at 1:09pm

Chemistry
a gas phase compound has a density of 2.10 g/l at 751 torr and 100 c what is the molecular weight
Monday, December 1, 2014 at 12:36pm

Chemistry
A student places 0.025 moles of solid sulfur and 0.100 moles of nitrogen monoxide gas in a closed 1.00L container and 0°c for several days. Calculate the number of molecules of NO in the 1.00L container after equilibrium is reached, given the following thermodynamic data. ...
Monday, December 1, 2014 at 11:39am

chemistry
What is crystalline pprecipitate? Please.
Monday, December 1, 2014 at 6:56am

Chemistry
Consider the following equation: 4B(s) + 3O2 (g) → 2B2O3 (s) ΔH = - 2509.1 kJ How much heat (in kJ) is transferred when 989 mg of B2O3 (s) is formed?
Monday, December 1, 2014 at 1:40am

Chemistry
HW Help!!!! An object at 4500 K emits the blackbody spectrum shown here. This object emits the most light in the __?__ part of the visible spectrum.
Monday, December 1, 2014 at 1:04am

Chemistry
The color of light emitted by a hot solid object depends on?
Monday, December 1, 2014 at 1:02am

Chemistry
Given the following equation: N2 (g) + 3H2 (g) → 2NH3 (g) ΔH = -92.6 kJ Calculate ΔH (in kJ) for the decomposition of 30.5 g NH3 (g) into N2 (g) and H2 (g)
Monday, December 1, 2014 at 1:00am

chemistry
write the specific heat water and liquid and gas
Monday, December 1, 2014 at 12:22am

Chemistry 2
In a particular redox reaction, MnO2 is oxidized to MnO4– and Ag is reduced to Ag. Complete and balance the equation for this reaction in acidic solution. Phases are optional.
Monday, December 1, 2014 at 12:10am

chemistry
chemical reactions type?
Sunday, November 30, 2014 at 11:16pm

Chemistry
1. Suppose that you have 0.500 L of each of the following solutions, and an unlimited supply of water. (Note: C9H7NHBr is a salt containing the ions C9H7NH+ and Br− and C9H7N is quinoline, an organic base with pKb = 6.24 at 298 K. If you like, you may represent C9H7NH+ ...
Sunday, November 30, 2014 at 11:10pm

chemistry
Sodium vapor lamps are used in Chicago to light city streets. The light emitted (given off) by these lamps has a λ of 5.9 x 10-7 m. What is the λ in cm? What is the λ in nanometers (nm) [1 meter = 1 x 109 nm]? What is the ν of this radiation? In what region...
Sunday, November 30, 2014 at 10:03pm

Chemistry
I need chemistry help. I think 1. c, 2.b, & 3.a (please tell me why or why not and help me set up the problems if possible) 1.) The following half reaction has been balanced except for the electrons. How many and where should the electrons be included? 14 H+(aq) + Cr2O72-(aq...
Sunday, November 30, 2014 at 9:10pm

Chemistry
5.) Which of the following is the strongest oxidizing agent? a.) Zn(s) b.) Mg(s) c.) Al3+(aq) d.) Mg2+(aq)
Sunday, November 30, 2014 at 9:06pm

chemistry-chemical equations
How do I write the balanced chemical equation for Copper +nitric acid -> copper(II)nitrate+ nitrogen dioxide + water
Sunday, November 30, 2014 at 8:48pm

Chemistry
To 1.0 ml of 1.5%NaCl, water is added to a final volume of 100ml. What is the molarity NaCl of this final solution? 1.5g/100ml I do not know where to go from here?
Sunday, November 30, 2014 at 8:45pm

chemistry
If you place 10.0 L of propanol (C3H8O) in a sealed room that is 3 m long, 2.75 m wide, and 2.5 m high, will all the propanol evaporate? If some liquid remains, how much will there be? The vapor pressure of propanol is 10.7 torr at 25 °C, and the density of the liquid at ...
Sunday, November 30, 2014 at 8:35pm

Chemistry
I'm looking for a video of a chemical reaction that can help me answer these questions What are the names of the reactants and products and their states @ room temperature? What type of reaction is it?
Sunday, November 30, 2014 at 8:32pm

Chemistry
Bromine has two naturally occurring isotopes, the first of which is 79Br with a mass of 78.904 amu and an abundance of 50.54%. Calculate the mass of the other isotope.
Sunday, November 30, 2014 at 8:12pm

Chemistry (Titrations)
In order to standardize a KMnO4 solution, 0.2848 g Fe(NH4)2(SO4)2·6H2O was dissolved in 25 mL 0.18 M H2SO4. The KMnO4 solution was added to the Fe(NH4)2(SO4)2·6H2O solution until a pale pink color persisted. The titration took 24.2 mL of KMnO4 solution. What is ...
Sunday, November 30, 2014 at 8:06pm

Chemistry
What volume of H2 gas (in liters), measured at 23 °C and 678 torr, can be obtained by reacting 7.59 g of zinc metal with 124 mL of 0.302 M HCl? Zn + 2HCl --> ZnCl2 + H2
Sunday, November 30, 2014 at 7:46pm

CHEMISTRY HELP
what are the diff b/in: 12. Dilute to and dilute with 13. Warm, boil 14. Heat almost to boiling 15. Heat just to boiling 16. Evaporate to 17. Evaporate to almost dryness 18. Concentrate the volume to 12. I know the meaning of dilute its reducing the concentration but idk ...
Sunday, November 30, 2014 at 7:39pm

chemistry
A 0.205 g sample of impure NaOH requires 17.5 mL of 0.2180 M HCl for neutralization. What is the percent of NaOH in the sample, by weight?
Sunday, November 30, 2014 at 7:31pm

Chemistry Correction
Hi, I'm trying to solve for the radius of the sphere. This is the correct steps: 8.27*10^-29 = 4/3 pi * r^3 r^3 = 2.0225 * 10^-29 cu meters When I do 8.27x10^-29 / 4/3 pi, I don't get the answer 2.0225x10^-29 Can you tell me what I'm doing wrong?
Sunday, November 30, 2014 at 7:28pm

chemistry
Determine how many milliliters of 0.310 M HClO4 will be required to neutralize 52.37g Ca(OH)2 according to the reaction: 2HClO4 + Ca(OH)2 ---> Ca(ClO4)2 + 2 H2O
Sunday, November 30, 2014 at 7:02pm

Chemistry
Consider the reaction for the production of NO2 from NO: 2 NO(g) + O2(g) = 2 NO2(g) a)If 84.8L of O2(g), measured at 35 degrees Celsius and 632mm Hg, is allowed to react with 158.2g of NO, find the limiting reagent. b) If 97.3L of NO2 forms, measured at 35 degrees Celsius and ...
Sunday, November 30, 2014 at 6:58pm

Chemistry
The addition of a crystal of sodium chlorate to a sodium chlorate solution containing no undissolved solute causes additional crystals of sodium chlorate to precipitate. The original solution was supersaturated or unsaturated
Sunday, November 30, 2014 at 12:20pm

Chemistry
how many grams of ammonium nitrate would you have to add to 25mL of room temperature water to get 36°F?
Sunday, November 30, 2014 at 1:20am

Chemistry
A) if you added 8g of ammonium nitrate to 25mL of room temperature water, what would be the temperature in °C?
Sunday, November 30, 2014 at 1:18am

introductory chemistry essentials
A 3.5 Liter sample of 5.8 M NaCL solution is diluted to 55 Liter. What is the molarity of the new solution?
Sunday, November 30, 2014 at 12:53am

Chemistry
Calculate the standard entropy, ΔS°rxn, of the following reaction at 25.0 °C using the data in this table. The standard enthalpy of the reaction, ΔH°rxn, is –44.2 kJ·mol–1. C2H4(G)+H20 ---> C5H5OH ΔS°rxn= ______ J*K^-1*mol^-1 ...
Sunday, November 30, 2014 at 12:38am

Chemistry
A solution is prepared that contains 0.0200 M AgNO# and 0.150 M KSCN. What is the equilibrium concentration of Ag+ ion in this solution? The Kf for Ag(SCN)4^3+ is 1.21x10^10 I'm not even sure how to set up this problem? Would I need to do an ice box? Ag(SCN) --> Ag+ + SCN
Saturday, November 29, 2014 at 11:24pm

chemistry
A solution contains 3.10 g of solute in 10.4 g of solvent. What is the mass percent of the solute in the solution?
Saturday, November 29, 2014 at 11:02pm

Chemistry
75.0 mL of a 1.40 M solution is diluted to a volume of 248 mL. A 124-mL portion of that solution is diluted using 165 mL of water. What is the final concentration?
Saturday, November 29, 2014 at 10:47pm

chemistry
What is the maximum amount of silver in grams that can be plated out of 3.8L of an AgNO3 solution containing 3.3% Ag by mass? (Assume that the density of the solution is 1.02g/mL .)
Saturday, November 29, 2014 at 9:30pm

Chemistry
What would you do in order to solve this question: "The enthalpy of combustion for benzoic acid is -3223.6kj/mol. Use the values of the standard enthalpies of formation of liquid water and CO2 to calculate standard enthalpy of formation of benzoic acid."
Saturday, November 29, 2014 at 9:27pm

chemistry
I'm working on substitution organic chemistry problems and I just had a question. There's an equation in which a molecule is treated with methanol in an acetone solution. Would the reaction be SN1 or SN2? I thought that it was SN2 because of the aprotic acetone, but ...
Saturday, November 29, 2014 at 8:59pm

Chemistry
During a Breathalyzer Test it was determined that 1.60mg of K2Cr2O7 was consumed by the above reaction. Calculate the number of milligrams of ethanol in the test sample.
Saturday, November 29, 2014 at 8:54pm

chemistry
Determine the pH (to two decimal places) of a solution prepared by adding 395 mL of 0.0360 M benzoic acid (C6H5COOH) to 12.5 g of sodium benzoate (NaC6H5COO).
Saturday, November 29, 2014 at 8:41pm

Chemistry
Let’s assume you have 250 ml of a 1.3M KOH solution and you want to neutralize it with the acid HBr. It takes 350 ml of the HBr solution to do so. What must have been the molarity of the HBr solution? HBr(aq) + KOH(aq) => KBr(aq) + H2O(l) The stoichiometry is already ...
Saturday, November 29, 2014 at 6:59pm

Chemistry
For an H+ concentration, [H+], of 4.3 x 10-4 M, would this be acidic, neutral or basic? Why? I'm assuming that because it is an H+ it would be acidic and H+ means acidic and OH- means base. Is this correct? And is there a better formula for this equation?
Saturday, November 29, 2014 at 6:53pm

Chemistry
What does 0.053 M NaCl mean? How many grams of sodium chloride are needed to make 5.0 liters of this solution?
Saturday, November 29, 2014 at 5:37pm

Chemistry
To make 250 ml of a 5%(w/v) calcium carbonate solution, how many grams of calcium carbonate will I need?
Saturday, November 29, 2014 at 5:35pm

chemistry
nitric acid is composed of HNO3 molecule.A sample of 4.50 g was obtained. calculate the number of oxygen atom in the sample. this is what i do .can u check if i am wrong or miss something answer : mole HNO3 = 4.50g/63 = 0.07 mol mole : no of particle/NA = 0.07x (avogardo ...
Saturday, November 29, 2014 at 5:10pm

chemistry
A balloon filled with 85 g of nitrogen gas that produced a pressure of 3.25 atm at 58C. What is the volume of the balloon/
Saturday, November 29, 2014 at 5:00pm

Chemistry
hydrogen gas is collected over water at a total pressure of 744 mm Hg at 20.0 C. If the volume of the wet hydrogen is 495 mL, what will the dry volume be at standard conditions? I know that you need to subtract the water vapor pressure from the total and I got 726.45 mmHg. (...
Saturday, November 29, 2014 at 4:35pm

chemistry
To make a phosphorus fertilizer, agricultural companies use the following reaction: Ca3P2O8 + 2H2SO4 --> CaH4P2O8 + 2CaH4SO6 (fertilizer) If 1.50 * 10^4 grams of H2SO4 are reacted with excess Ca3P2O8 and H2O, how many grams of fertilizer can be made? Hi, I pretty much get ...
Saturday, November 29, 2014 at 3:20pm

chemistry
What volume of a 0.550 M solution of potassium hydroxide can be made with 14.3 g of potassium hydroxide? (Ignore significant figures for this problem.)
Saturday, November 29, 2014 at 3:16pm

chemistry
cal culate the ph of a mixture of 100 ml distilled water and 2 ml of 2M of NaOH
Saturday, November 29, 2014 at 1:08pm

chemistry
titration of 50ml of 0.25ammonia with 0.5M HCL . a) find the initial PH value b) volume of HCL is required to reach the equivalent poinnt c)the ph at the equivalence point
Saturday, November 29, 2014 at 12:59pm

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