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December 20, 2014

Homework Help: Science: Chemistry

Recent Homework Questions About Chemistry

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chemistry
) Indicate how each of the following errors would affect(increase, decrease, or no change) your calculated value for the molar volume of O2 at STP (assuming that you complete the expiriment otherwise correctly). In each case, explain your answer. A. Your sample was not ...
Friday, December 5, 2014 at 2:14am

Chemistry
Rank these from lowest boiling point to highest. CH4 CH3CH2CO2CH2CH3 CH3(CH2)2C=ONH2 CH3COOH
Friday, December 5, 2014 at 1:29am

Chemistry
How do I do the empirical formula for 37.01% carbon, 2.22% hydrogen, 18.50% nitrogen, and 42.27% oxygen? My teacher gave me the answer (C7H5N3O6), but I can never get that answer.
Friday, December 5, 2014 at 1:23am

chemistry
At temperatures above 0°C, what is the sign of the change in free energy for the conversion of liquid water to ice? A. Positive B. Zero C. Negative D. Not known I don't this it is A. I thought it might be c.
Thursday, December 4, 2014 at 11:37pm

chemistry
How many milliliters of 0.50M NaOH solution are required to titrate 20.0mL of a 0.20M H2SO4 solution to an end point?
Thursday, December 4, 2014 at 11:27pm

chemistry
What is the final volume of NaOH solution prepared from 200.0mL of 0.500M NaOH if you wanted the final concentration to be 0.200M ?
Thursday, December 4, 2014 at 11:24pm

chemistry
a balloon is filled with 15 L of an ideal gas of 20C. at this temperature the pressure of the gas is 1520 mm Hg. Suppose that the volume of the gas is reduced to 5 L at 290 K. what is the new pressure of the gas in atmospheres?
Thursday, December 4, 2014 at 9:56pm

Chemistry honors
20 grams magnesium metal react with excess oxygen and 28 grams of magnesium oxide are produced in lab what is percent yield? If 99.8 g of aluminum nitrate are reacted with excess sulfuric acid what would be the theoretical yield in grams of aluminum sulfate? i have done both ...
Thursday, December 4, 2014 at 7:41pm

Chemistry
Given the equation N2(g)+3H2(g)→2NH3(g), what is the total number of moles of NH3 produced when 10 mol of H2 reacts completely with N2? 1. 2.0 mol 2. 3.0 mol 3. 6.7 mol 4. 15 mol
Thursday, December 4, 2014 at 7:36pm

Chemistry
According to the reaction 2Al+3H2SO4→3H2+Al2(SO4)3, the total number of moles of H2SO4 needed to react completely with 5.0 mol of AL is 1. 2.5 mol 2. 5.0 mol 3. 7.5 mol 4. 9.0 mol
Thursday, December 4, 2014 at 7:32pm

chemistry
grams of potassium permanganate are in 2.58 moles i dont get it ? help
Thursday, December 4, 2014 at 7:02pm

chemistry
A sample of 0.250 g of nickel complex was titrated with 0.150 M EDTA. If the titration of the nickel sample required 7.5 mL of EDTA to reach the equivalence point, what is the percent nickel in the sample?
Thursday, December 4, 2014 at 6:50pm

Chemistry
The Ksp of calcium hydroxide, Ca(OH)2, is 4.68 x 10-6 at 289.15K. Calculate the pH of a saturated solution. Here's my work: 4.68 x 10-6= 4s^3 s= 0.0105 -log(0.0105)= 1.98 14-1.98=12.02 The answer is supposed to be 12.324, but I'm not sure what I'm doing wrong. Is ...
Thursday, December 4, 2014 at 6:32pm

chemistry
9.0 g of KCl was dissolved in 300 mL of water in a calorimeter. Calculate the heat of solution in kJ/mol if the temperature dropped by 2.53 K on dissolution. The specific heat of water is 4.184 J/g K
Thursday, December 4, 2014 at 10:52am

chemistry
the number of electrons present in 18 ml of water at 4 degrees celsius? a)6.023*10^24 b)6.023*10^23 c)4.76*10^21 d)4.76*10^20
Thursday, December 4, 2014 at 10:04am

Chemistry
My chemistry is bad. I know these are very easy but I cannot solve them . 1. a) Prepare 200 ml of 2 M HCl solution from stock bottle containing 37% w/w HCl and d = 1.2 (g/ml). MWHCl = 36.5 g b) Calculate M of 37% w/w HCl solution? d= 1.2, then solve the above problem 2. a) ...
Thursday, December 4, 2014 at 4:13am

chemistry
how many milligrams of calcium is in 1.229-g of calcium carbonate?
Thursday, December 4, 2014 at 3:48am

chemistry
what is the mass (by difference) of a sample if the initial mass of the sample in the bottle was 29.89-g and the final mass of the bottle and sample was 22.01-g ?
Thursday, December 4, 2014 at 1:55am

Chemistry
What is the ppm of 4.50mg of ddt in 10kg of seal fat Please show how
Wednesday, December 3, 2014 at 11:34pm

Chemistry
A sample of gas in a cylinder of volume 3.78 L at 318 K and 3.3 atm expands to 6.76 L by two different pathways. Path A is an isothermal, reversible expansion. Calculate the work for Path A. Answer in units of J
Wednesday, December 3, 2014 at 11:30pm

chemistry
Write an equilibrium expression for each chemical equation involving one or more solid or liquid reactants or products. HCHO2(aq)+H2O(l)⇌H3O+(aq)+CHOͨ​2;2(aq) Use A for [HCHO2], B for [H2O], C for [H3O+], D for [CHO−2].
Wednesday, December 3, 2014 at 11:23pm

Chemistry
In the carbon diselenide, CSe2, identify the number of σ and π bonds, the necessary hybridization scheme and the orbital overlap. Thanks
Wednesday, December 3, 2014 at 8:52pm

physical chemistry
A solution is prepared by adding 1g of sugar mannitol (MW 182.2g/g-mole) in 100g of water at 20◦C. (a) Assuming that mannitol and water form an ideal solution, what is the equilibrium vapor pressure of solution? The vapor pressure of pure water is 17.54mmHg at 20◦C
Wednesday, December 3, 2014 at 8:32pm

CHEMISTRY
A solution with a pH of 7 has a [OH1-] of? 0M or 7M???????????????????
Wednesday, December 3, 2014 at 7:41pm

Chemistry
If 325mL of a 0.58 M solution of a propanoic acid (a fatty acid) was mixed with excess glycerol what is, the maximum number of molecules of fat or oil that could result?(you will need Avogadros number = 6.022 X 10 to the 23rd power)....I need to show all work and im completely...
Wednesday, December 3, 2014 at 7:17pm

Chemistry
E=hv E=energy h= Planck's constant =6.626 x 10^-34 v= frequency 1. What is the energy of light having a frequency of 2.28 x 10^12? ( I do have an answer for this but I'm not so sure about it.) 2.What is the energy of light with a wavelength of 2.18 x 10^-5? 3. A photon...
Wednesday, December 3, 2014 at 7:07pm

CHEMISTRY
Identify the conjugate base in the following reaction. H2O (l) + HCO31- (aq) ¨ H3O+ (aq) + CO32- (aq)? Identify the Bronsted-Lowry acid in the following reaction. H2O (l) + HCO31- (aq) ¨ H3O+ (aq) + CO32- (aq)
Wednesday, December 3, 2014 at 7:01pm

chemistry
A solution with a pH of 7 has a [OH1-] of? 1 x 10-7 M?? Is that correct
Wednesday, December 3, 2014 at 6:59pm

Chemistry
How many moles of electrons are involved in an electrolytic process if 3.07 amps are applied to the cell for 46.0 hours? The answer is 5.27, but I'm not sure how to get there. Please help!
Wednesday, December 3, 2014 at 6:50pm

Chemistry
How much work (in J) is required to expand the volume of a pump from 0.0 L to 2.3L against an external pressure of 1.0atm ?
Wednesday, December 3, 2014 at 6:18pm

chemistry
A sample of steam with a mass of 0.524g and at a temperature of 100 ∘C condenses into an insulated container holding 4.20g of water at 6.0∘C.( ΔH∘vap=40.7 kJ/mol, Cwater=4.18 J/g⋅∘C) Assuming that no heat is lost to the surroundings, what is ...
Wednesday, December 3, 2014 at 5:38pm

chemistry
How much ice (in grams) would have to melt to lower the temperature of 355mL of water from 26∘C to 6∘C? (Assume the density of water is 1.0 g/mL.)
Wednesday, December 3, 2014 at 5:00pm

chemistry
Calculate the amount of heat required to completely sublime 71.0g of solid dry ice (CO2) at its sublimation temperature. The heat of sublimation for carbon dioxide is 32.3 kJ/mol.
Wednesday, December 3, 2014 at 4:56pm

Chemistry
When Pb-208 bombarded with Ni-64, a new element and six neutrons are produced. What isotope of the new element is produced by this reaction? Question 17 options: Ds-266 Ds-272 Rf-266 Rf-272 I believe it is either rf- 272 or Ds-272 because i added 208+64, but I do not know how ...
Wednesday, December 3, 2014 at 4:47pm

chemistry
A mixture of ammonia and oxygen is prepared by combining 0.330 L of NH3 (measured at 0.710 atm and 22°C) with 0.200 L of O2 (measured at 0.740 atm and 51°C). How many milliliters of N2 (measured at 0.740 atm and 100. °C) could be formed if the following reaction ...
Wednesday, December 3, 2014 at 3:31pm

Chemistry
I'm doing a redox potential/lead acid cell experiment and one of the questions that were asked was: -What were the identities of the gases you saw being produced at the + and - electrodes during the cell conditioning process? We used H2SO4 How do I go about answering this...
Wednesday, December 3, 2014 at 1:02pm

chemistry
Write out the mechanism (using correct curved arrow notation) for the acid-catalyzed, cis-trans isomerization of maleic acid (into fumaric acid) If teh electrophilic addition reaction of maleic acid with HCl had gone to completion what would be the structure of the addition ...
Wednesday, December 3, 2014 at 6:56am

chemistry
Why do alkenes but not alkanes exhibit cis-trans isomerism?
Wednesday, December 3, 2014 at 12:36am

chemistry
There are no known stable cyclic compounds with a ring size of seven or less that has an alkyne linkage in the ring. Why?
Wednesday, December 3, 2014 at 12:34am

chemistry
A voltaic cell is constructed with all the reactants and products in their standard states. Will this condition hold as the cell operates? Explain.
Wednesday, December 3, 2014 at 12:31am

Chemistry
Show how to calculate the molarity of 45 g of hcl in 1.5 L of water 36.46g/mol/1.5=24.30726Mhcl
Tuesday, December 2, 2014 at 11:29pm

Chemistry
Show how to calculate the molarity of 45 g of hcl in 1.5 L of water
Tuesday, December 2, 2014 at 10:55pm

Chemistry
When did these scientists make their contributions ? The years Democritus believes that the universe was made of tiny uncuttable particles. Heisenberg works with the Quantum Theory Chadwick finds the missing mass of the atoms nucleus Dalton's believes that atoms of a given...
Tuesday, December 2, 2014 at 10:52pm

chemistry-URGENT
how many moles of atoms are contained in 7.654 x 10^32 atoms of Ga ? Thank you!
Tuesday, December 2, 2014 at 9:38pm

Chemistry
under standard conditions, the following reaction is spontaneous at 298K. O2 + 4H+ + 4Br- --> 2H2O + 2 Br2 Will the reaction be spontaneous if the PH value is adjusted using a buffer composed of 0.10 M benzoic acid and 0.12M sodium benzoate? Given:Given: Ka for benzoic acid...
Tuesday, December 2, 2014 at 9:36pm

Chemistry
What is the solubility of CaF2 in a buffer solution containing 0.45M formic acid and 0.20M sodium formate? Given: Ka for formic acid=1.7x10^-4 Ka for hydrofluoric acid=6.8x10^-4 Ksp for CaF2=3.4x10^-11 Thank you so much. I don't have much idea on this.I just calculated the...
Tuesday, December 2, 2014 at 9:32pm

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

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