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December 18, 2014

Homework Help: Science: Chemistry

Recent Homework Questions About Chemistry

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chemistry
The vapour density of a gas is 22.4 and mass is. 22.4grams.what is the volume occupied the gas at N .T .P ?
Friday, May 9, 2014 at 4:56pm

Science, Chemistry
Hess's law ____. A) makes it possible to calculate ΔH for complicated chemical reactions B) states that when you reverse a chemical equation, the sign of ΔH does not change. C) determines the way a calorimeter works D) describes the vaporization of solids Highly ...
Friday, May 9, 2014 at 3:44pm

Chemistry
The pH of a .200M HBrO solution is 4.67. What is the acids Ka?
Friday, May 9, 2014 at 11:14am

Chemistry
What would be the freezing and boiling points of a solution prepared by dissolving 1.00g of benzoic acid (C6H5CO2H) in 10.0g of benzene?
Friday, May 9, 2014 at 8:07am

chemistry
What would be the freezing and boiling points of a solution of 5.00g of sodium chloride dissolved in 25.0g of water?
Friday, May 9, 2014 at 8:07am

chemistry
20 mL of 0.125 M potassium iodide solution is mixed with 10 mL of 0.1 g L–1 sodium thiosulfate solution and 0.2 g of solid iodine indicator is added. To this solution is added 20 mL of 0.025 M peroxodisulfate solution. After 46 seconds a blue colour appears, indicating ...
Friday, May 9, 2014 at 6:03am

chemistry
hydrogen may not be advantagous as a fuel because
Friday, May 9, 2014 at 1:14am

CHEMISTRY HELP !!!! CHECK !!!
Al3+ is reduced to Al(s) at an electrode. If a current of 2.75 ampere is passed for 36 hours, what mass of aluminum is deposited at the electrode? Assume 100% current efficiency. a. 9.2 x 10–3 g b. 3.3 x 101 g c. 9.9 x 101 g d. 1.0 x 102 g e. 3.0 x 102 g Answer 2.75 A for...
Thursday, May 8, 2014 at 11:54pm

CHEMISTRY HELP ! Check Please!
Calculate the cell potential, at 25 C, based upon the overall reaction Zn2+(aq) + 2 Fe2+(aq) -> Zn(s) + 2 Fe3+(aq) if [Zn2+] = 1.50 x 10-4 M, [Fe3+] = 0.0200 M, and [Fe2+] = 0.0100 M. The standard reduction potentials are as follows: Zn2+(aq) + 2 e– --> Zn(s) E&#...
Thursday, May 8, 2014 at 11:30pm

chemistry
If 80.6 pounds of alcohol are mixed with 42.7 pounds of water, what is the percent of water (by weight) in the mixture? Answer in units of %
Thursday, May 8, 2014 at 11:03pm

chemistry
If 59.4 pounds of alcohol are mixed with 28.3 pounds of water, what is the percent alcohol (by weight) in the mixture? Answer in units of %
Thursday, May 8, 2014 at 11:02pm

chemistry
what is the final temperature of amixture containning 25 grams of ice at -20 degree celciusadded to water at room temperature 22oC mass of water is 50g
Thursday, May 8, 2014 at 8:16pm

Chemistry
The voltage generated by the zinc concentration cell described by, Zn(s)|Zn2 (aq, 0.100 M)||Zn2 (aq, ? M)|Zn(s) is 21.0 mV at 25 °C. Calculate the concentration of the Zn2 (aq) ion at the cathode.
Thursday, May 8, 2014 at 8:00pm

Chemistry 104
A current of 3.40 A is passed through a Ni(NO3)2 solution for 1.80 hours. How much nickel is plated out of the solution?
Thursday, May 8, 2014 at 7:59pm

Chemistry
So I am trying to understand in molecular terms the solubility of NaCl in water. So there are intramolecular forces that are mostly ionic between the ions, creating this partial positive, partial negative substance. And the intermolecular forces are also ionic. Ionic forces ...
Thursday, May 8, 2014 at 7:54pm

Chemistry 104
The voltage generated by the zinc concentration cell described by, Zn(s)|Zn2 (aq, 0.100 M)||Zn2 (aq, ? M)|Zn(s) is 11.0 mV at 25 °C. Calculate the concentration of the Zn2 (aq) ion at the cathode.
Thursday, May 8, 2014 at 7:28pm

chemistry
What is the final temperature when 54g ice at 0oC is mixed with 200g water at 65oC
Thursday, May 8, 2014 at 7:28pm

Chemistry 104
A current of 3.40 A is passed through a Ni(NO3)2 solution for 1.80 hours. How much nickel is plated out of the solution?
Thursday, May 8, 2014 at 7:21pm

Chemistry
Calculate the cell potential for the following reaction as written at 25.00 °C, given that [Cr2 ] = 0.859 M and [Ni2 ] = 0.0190 M. Standard reduction potentials can be found here.
Thursday, May 8, 2014 at 7:18pm

Chemistry
Calculate the cell potential for the following reaction as written at 25.00 °C, given that [Cr2 ] = 0.859 M and [Ni2 ] = 0.0190 M. Standard reduction potentials can be found here.
Thursday, May 8, 2014 at 7:09pm

Chemistry
How many grams of nitrogen are required to react with 2.79g of hydrogen to produce ammonia? A) 25.8 g B) 13.0 g C) 78.2 g D) 38.7 g E) 77.4 g I get the answer as 38.7 but it is meant to be B I did 2.79g x 3molH2/2.016g/mol x 1molN2/3molH2 x 28.02g/mol/1moleN2
Thursday, May 8, 2014 at 6:52pm

Chemistry
What would the potential of a standard hydrogen (S.H.E.) electrode be if it was under the following conditions? [H+] = 0.38 P(H2) = 3.8 T = 298 K
Thursday, May 8, 2014 at 6:18pm

Chemistry
Calculate the cell potential for the following reaction as written at 25.00 °C, given that [Cr2 ] = 0.859 M and [Ni2 ] = 0.0190 M. Standard reduction potentials can be found here. Cr+Ni(2+) ->Cr(2+) + Ni
Thursday, May 8, 2014 at 6:16pm

Chemistry
Calculate the standard free-energy change for the following reaction at 25 °C. Standard reduction potentials can be found here. 2Au(3+) + 3Cr-->2Au+3Cr(2+)
Thursday, May 8, 2014 at 6:15pm

Chemistry 104
A current of 3.40 A is passed through a Ni(NO3)2 solution for 1.80 hours. How much nickel is plated out of the solution?
Thursday, May 8, 2014 at 6:01pm

College Chemistry
1 L of N_2_ gas, having a pressure of 2.5 atm, is added 1 L of Ar gas, having a pressure of 3.7 atm, in a sealed, rigid flask. What is the final pressure in the flask?
Thursday, May 8, 2014 at 5:29pm

Steps in Chemistry
You notice that a lawn looks unhealthy and that, perhaps, the grass is dying. Undertake a scientific project to save the lawn. What is your initial hypothesis? Describe an experiment you can design to test it - include more than 1 step and variables. Hypothesis: “Adding ...
Thursday, May 8, 2014 at 1:07pm

Chemistry
Write the formulas for silicon dioxide. SiO2 so how am i suppose to write formula(s) for it? like how ?
Thursday, May 8, 2014 at 12:53pm

Chemistry
Complete and balance the following equation. Then write it as a net ionic equation. K3PO4(aq) + MgCl2(aq) Umm...help
Thursday, May 8, 2014 at 12:33pm

Chemistry
I need help with Chemistry homework.. I dont know how to write formulas..Please help me! Write the formulas for silicon dioxide.
Thursday, May 8, 2014 at 12:01pm

Chemistry
A solution of 22.0g of nonionic ascorbic acid in 100.0g of water freezes at – 2.33°C. What is the formula weight of the acid?
Thursday, May 8, 2014 at 11:38am

Chemistry
How much heat in kilojoules must be removed from a glass of water that contains 100g of water to lower its temperature from 30 C to 15 C?
Thursday, May 8, 2014 at 11:34am

chemistry
Assume you poured 5.00 g of KOH in 250 mL of pure water. What is the molarity of the solution you made?
Thursday, May 8, 2014 at 10:20am

Chemistry - Science (Dr. Bob222)
Nitrogen gas has values of Cv and Cp of 20.8 and 29.1 J K-1 mol-1, respectively. When a certain amount of nitrogen is heated at constant pressure, what fraction of the heat Q is used to increase the internal energy of the gas, and how is the remaining energy used? A) 3/2 of Q ...
Thursday, May 8, 2014 at 8:44am

Chemistry - Science (Dr. Bob222)
Hydrazine is used as a rocket fuel because its reaction with oxygen is extremely exothermic: N2H4(liquid) + O2(g)  N2(g) + 2H2O(liquid) ΔH(reaction) = -615 kJ mol-1 What is the enthalpy of this reaction if water were produced in the gaseous rather than the liquid ...
Thursday, May 8, 2014 at 8:37am

(12)Chemistry - Science (Dr. Bob222)
Calculate delta E for a process in which 88.0 g of nitrous oxide gas (N2O) is cooled from 165 ˚C to 65 ˚C at a constant pressure of 5.00 atm. The molecular weight of nitrous oxide is 44.02 g/mol, and its heat capacity at constant pressure, Cp, is 38.70 J/molK. A) - ...
Thursday, May 8, 2014 at 7:51am

(23.Chemistry - Science (Dr. Bob222)
An electrochemical battery made from Sn and Cu electrodes under standard conditions shows an initial voltage of V= 1.1 V. If the concentration of both Cu2+ and Sn2+ solutions is increased to 2 M from 1 M, the observed voltage will: (Hint: use the Nernst equation) A. increase ...
Thursday, May 8, 2014 at 7:17am

(19) Chemistry - Science (Dr. Bob222)
Use the following information to answer this question: Cu+(aq) + e- → Cu(s) E° = 0.521V Cu2+ (aq) + e- → Cu+ (aq) E° = 0.153 V. Given these half cell reactions, an aqueous solution of Cu+ ion in the absence of O2(g) : A. will be thermodynamically stable B. ...
Thursday, May 8, 2014 at 7:08am

Chemistry
Calculate molarity of HNO3 please help? Calculate molarity of HNO3 prepared by dissolving 22.3 grams of HNO3 in water to make 875 ml of solution... Please help I'm stuck
Thursday, May 8, 2014 at 3:53am

chemistry
a 2.00 L ballon at 25 degrees celcius and 745mmHg floats on an altitude where the temperature is 10 degrees celcius and the air pressure is 700mmHg. what is the new volume othe balloon
Thursday, May 8, 2014 at 3:53am

Chemistry
Why is the first ionisation energy of chlorine greater than the first ionisation energy of Lithium ?
Thursday, May 8, 2014 at 3:22am

Chemistry
Please Help! Describe how water could be classified as either an acid or a base. Give an example of each (acid and base). What word describes substances that can be classified as acids or bases?
Thursday, May 8, 2014 at 2:02am

Chemistry
You can purchase hydrochloric acid in a concentrated form that is 37.0 hcl by mass and has a density of 1.20g/mL. Describe how exactly you would prepare 2.85 L of 0.500 M HCL from the concentrated solution.
Wednesday, May 7, 2014 at 10:35pm

chemistry
A cylinder contains 40 g of HE, 56 g of N2, and 40 g of Ar. How many moles of each gas are in the mixture?
Wednesday, May 7, 2014 at 9:21pm

chemistry
.256g unknown acid is titrated with .12M NaOH. It requires 34.8ml of base to reach the equivalence point. What is the molar mass of the acid?
Wednesday, May 7, 2014 at 9:18pm

chemistry
20.70 ml of .42 M HClO4 is required to neutralize .966g of an unknown base. Find the molar mass of the base .
Wednesday, May 7, 2014 at 9:16pm

chemistry
18.6 g KOH is neutralized by 58.4 ml of unknown acid find the molarity of the acid.
Wednesday, May 7, 2014 at 9:14pm

(11) Chemistry - Science (Dr. Bob222)
In the following hypothetical reaction A + B → C + D, the equilibrium constant, Keq is less than 1.0 at 25°C and decreases by 35% on changing the temperature to 45°C. What must be true according to this information? A. The ΔH° for the reaction is ...
Wednesday, May 7, 2014 at 7:15pm

Chemistry - Science (Dr. Bob222)
The following reaction has a positive value of ΔG°. 2H2O(g) → 2H2(g) + O2(g) Which of the following statements must be true? A. The reaction is slow. B. The reaction will not occur. That is, when H2O(g) is introduced into a flask, no O2 or H2 will form even over...
Wednesday, May 7, 2014 at 7:04pm

CHEMISTRY HELP !!!!
Al3+ is reduced to Al(s) at an electrode. If a current of 2.75 ampere is passed for 36 hours, what mass of aluminum is deposited at the electrode? Assume 100% current efficiency. a. 9.2 x 10–3 g b. 3.3 x 101 g c. 9.9 x 101 g d. 1.0 x 102 g e. 3.0 x 102 g I think it is ...
Wednesday, May 7, 2014 at 3:46pm

CHEMISTRY HELP !!!!
Complete the following fission reaction 1/0 n + 235/92 U ---> 236/92 Te + _____ +2 (1/2)n a) 97/40 Zr b) 99/40 Zr c) 99/38 Sr d) 95/42 Mo e) 96/41 Y Answer is A or B not sure
Wednesday, May 7, 2014 at 3:41pm

CHEMISTRY HELP !!!!
If a nucleus undergoes beta particle emission a. its atomic number decreases by four and its mass number decreases by two. b. its atomic number decreases by two and its mass number decreases by four. c. its atomic number increases by one and its mass number is unchanged. d. ...
Wednesday, May 7, 2014 at 3:25pm

Chemistry
Consider an aqueous solution that contains 22 % (by mass) of a hypothetical solute Z. The formula weight of the solute Z is 215.2. The density of the solution is observed to be 1.12 g/mL. What is the molarity of Z in this solution? Answer in grams
Wednesday, May 7, 2014 at 3:23pm

Chemistry
Calculate the Molarity of the solution that contains 43.5 grams of K2SO4 in a total volume of 250ml.
Wednesday, May 7, 2014 at 1:04pm

Chemistry
What determines whether one metal will replace another metal from a compound in a single-replacement reaction?
Wednesday, May 7, 2014 at 12:45pm

chemistry
If 15.0 grams of Iron (III) oxide reacts with 25.0 grams of Strontium phosphate, how many grans of Iron (III) phosphate will be produced?
Wednesday, May 7, 2014 at 12:00pm

chemistry
Solution A:50cm^3 of 1.0mol dm^-3 hydrochloric acid,HCl Solution B:10cm^3 of 2.0mol dm^-3 hydrochloric acid,HCl (a)Calculate the number of moles of hydrochloric acid,HCL in each solution. (b)Solution A and B are mixed together. (i)Calculate the number of moles of hydrochloric ...
Wednesday, May 7, 2014 at 11:15am

chemistry
Two solutions were prepared. The first was a 0.672 M solution of aluminum hydroxide and the second was a 0.405 M sulfuric acid solution. 1.) If a total of 500 mL of aluminum hydroxide solution was prepared, how many grams of the solute (AL(OH)3) would have been weighed out in ...
Wednesday, May 7, 2014 at 11:14am

chemistry pls help me asap
100cm^3 of a sodium hydroxide,NaOH solution contains 4.0g of solid sodium hydroxide,NaOH.40 cm^3 of phosphoric acid,H3PO4 is needed to neutralise 40cm^3 of the alkali.(RAM:H,1;O,16;Na,23;P,31) (a)Calculate the molarity of the sodium hydroxide,NaOH solution. (b)Calculate the ...
Wednesday, May 7, 2014 at 11:07am

chemistry
200cm^3 of 1.0 mol dm^-3 sulphuric acid,H2SO4 is poured into a 250 cm^3 volumetric flask.Distilled water is then added to make 250 cm^3 of solution. (a)What is the molarity of the diluted acid solution? (b)What is the volume of 1.6 mol dm^-3 sodium hydroxide,NaOH solution ...
Wednesday, May 7, 2014 at 10:59am

chemistry
A student dissolved 3.65 g of hydrogen chloride gas,HCL in water to make 1.0dm^3 of solution.Calculate the volume of a 0.1 mol dm^-3 barium hydroxide,Ba(OH)2 solution required to completely neutralise 25.0 cm^3 of the acid solution.(RAM:H,1;CL,35.5)
Wednesday, May 7, 2014 at 10:54am

chemistry
The volume of 0.15 mol dm ^-3 sulphuric acid,H2SO4 required to completely neutralise 25.0cm^3 of potassium hydroxide,KOH solution.
Wednesday, May 7, 2014 at 10:50am

chemistry
50.0cm^3 of 2.0 mol dm^-3 aluminium sulphate,Al2(SO4)3 solution Calculate the number of moles of ions.
Wednesday, May 7, 2014 at 10:48am

chemistry
The solubility of AB(s) in a 1.000-M solution of C(aq) is found to be 0.121 M. What is the Ksp of AB?
Wednesday, May 7, 2014 at 2:54am

CHEMISTRY HELP !!!!
what is the formula for dicyanobis (ethylenediamine) zirconium (IV) nitrate? Thanks!!!
Wednesday, May 7, 2014 at 12:09am

Chemistry
Butane, C4H10, is a component of natural gas that is used as fuel for cigarette lighters. The balanced equation of the complete combustion of butane is 2C4H10(g)+13O2(g)→8CO2(g)+10H2O(l)​ At 1.00 atm and 23 ∘C, what is the volume of carbon dioxide formed by ...
Tuesday, May 6, 2014 at 10:15pm

Chemistry
How do i provide ionic equations , for example to this one --> HNO3(aq) + KOH(aq)
Tuesday, May 6, 2014 at 10:03pm

Chemistry
Calculate the volume of 2.00 M solution of KOH that is required to neutralize 30.0 mL of 1.00 M solution of HNO3.
Tuesday, May 6, 2014 at 9:36pm

Chemistry
What is the % mass/volume of a 3.00 M solution of NaCl?
Tuesday, May 6, 2014 at 9:35pm

chemistry
For each organic compound, determine if it is an alkane, alkene, or alkyne. (No ringed structures and only one multiple bond per structure.) 1. C10H18 - alkyne 2. C15H32 - alkane 3. C20H40 - alkyne 4. C5H10 - alkene 5. C3H6 - alkene 6. C7H16 - alkane I am not sure on number 3
Tuesday, May 6, 2014 at 9:12pm

CHEMISTRY HELP !!!!
Assuming the following reaction proceeds in the forward direction, 3 Sn4+(aq) + 2 Cr(s)  3 Sn2+(aq) + 2 Cr3+(aq) a. Sn4+(aq) is the reducing agent and Cr(s) is the oxidizing agent. b. Cr(s) is the reducing agent and Sn2+(aq) is the oxidizing agent. c. Sn4+(aq) is the ...
Tuesday, May 6, 2014 at 8:56pm

CHEMISTRY HELP !!!!
Which of the following statements is/are CORRECT? 1. Naturally occurring isotopes account for only a small fraction of known radioactive isotopes. 2. A few radioactive isotopes with long half-lives, such as U-235 and U-238, are found in nature. 3. Trace quantities of some ...
Tuesday, May 6, 2014 at 8:53pm

Chemistry
Calculate the molarity of an HCI solution, if 20.0 mL of it were neutralized by 10.0 mL of 2.00 M solution of NaOH.
Tuesday, May 6, 2014 at 8:32pm

Chemistry
Calculate the volume of 2.00 M solution of KOH that is required to neutralize 30.0 mL of 1.00 M solution of HNO3.
Tuesday, May 6, 2014 at 8:29pm

Chemistry
What is the % mass/volume of a 3.00 M solution of NaCl?
Tuesday, May 6, 2014 at 8:21pm

chemistry
A silver block, initially at 59.4∘C^\circ C, is submerged into 100.0 g{\rm g} of water at 25.3∘C^\circ C, in an insulated container. The final temperature of the mixture upon reaching thermal equilibrium is 27.6∘C^\circ C.
Tuesday, May 6, 2014 at 8:02pm

chemistry
Calculate the molar it of a solution that contains 5.4 get of sodium sulfate dissolved in enough water to make 3.5 L of solution
Tuesday, May 6, 2014 at 5:44pm

Chemistry
The formation constant of [M(CN)6]4– is 2.50 × 1017, where M is a generic metal. A 0.170-mole quantity of M(NO3)2 is added to a liter of 1.31 M NaCN solution. What is the concentration of M2 ions at equilibrium?
Tuesday, May 6, 2014 at 4:19pm

Chemistry
A tank contains helium for filling balloons. It holds 6.75 L of Ne at 24.8 atm and 27.5 °C. What would be the volume of this helium at 2.13 atm and 10.6 °C?
Tuesday, May 6, 2014 at 3:14pm

chemistry
The mean activity coefficients of HBrin 5.0 and 20.0 mmol kg –1 are 0.930 and 0.879, respectively. Consider a hydrogen electrode in HBr(aq) solution at 25 °C operating at 1.15 atm. Calculate the change in the electrode potential when the molality of the acid solution ...
Tuesday, May 6, 2014 at 2:21pm

(5) Chemistry - Science (Dr. Bob222)
Consider a buffer made from 0.13 M sodium acetate and 0.10 M acetic acid in 1L. What amount of KOH must be added to cause an increase of the pH by 0.14? A) 0.048 mol B) 0.038 mol C) 0.028 mol D) 0.018 mol E) 0.008 mol
Tuesday, May 6, 2014 at 2:03pm

Chemistry - Science (Dr. Bob222)
Ammonia is a weak base with a Kb of 1.8 x 10-5. A 100.0 mL sample of 0.13 M aqueous solution of ammonia (NH3) is mixed with 87 mL of 0.15 M solution of the strong acid HCl, calculate the pH of the final solution. A) 2.9 B) 11.1 C) 8.8 D) 5.2 E) None of the above
Tuesday, May 6, 2014 at 1:11pm

Chemistry - Science (Dr. Bob222)
How many mmol ( millimoles) of HCl must be added to 130.0 mL of a 0.40M solution of methyl amine (pKb = 3.36) to give a buffer having a pH of 11.59? Thank you for your help!
Tuesday, May 6, 2014 at 12:57pm

CHEMISTRY HELP !!!!
What is the name of the compound having the formula [Cr(en)2(H2O)2]SO4? a. dihydroxydiethlyenediamminechromate(2) sulfate b. diaquabis(ethylenediamine)sulfatochromat​e(4) c. bis(ethylenediamine)diaquachromium(2) sulfato d. diaquabis(ethylenediamine)sulfatochromiu​...
Tuesday, May 6, 2014 at 11:16am

chemistry
If you have a 29.6 mass percent KCl in benzene,what is the new boiling point?
Tuesday, May 6, 2014 at 11:05am

chemistry
If you collect hydrogen gas over water at a temperature of 85*C, what is the volume of just the water if the pressure of hydrogen is 1.23 atm and the grams of hydrogen was 2.6
Tuesday, May 6, 2014 at 11:01am

chemistry
What is the [CH3NH3+] of a solution which is 0.1003 M in CH3NH2 and 0.1204 M in CsOH? CH3NH2(aq) + H2O(l) « CH3NH3+(aq) + OH−(aq)
Tuesday, May 6, 2014 at 10:37am

chemistry
What is the [C7H5O2−] in a solution which is 0.1283 M in HC7H5O2 and 0.1364 M in HBr? HC7H5O2(aq) + H2O(l) « C7H5O2−(aq) + H3O+(aq) Ka = 6.5000e-5
Tuesday, May 6, 2014 at 10:37am

chemistry
What would Qc be if the volume of the container decreased by a factor of 1.774 for the following reaction? PH3(g) + BCl3(g) → PH3BCl3(s) KC = 534.8 at 353.0oC
Tuesday, May 6, 2014 at 10:36am

chemistry
At 2273 K the equilibrium constant for the reaction 2 NO(g) « N2(g) + O2(g) KC = 2400 What would be the equilibrium concentration of N2 if the initial concentration of NO was 0.1778 M?
Tuesday, May 6, 2014 at 10:36am

chemistry
At 674.5 K the equilibrium concentrations of N2, H2, and NH3 were 0.1614 M, 0.1128 M, and 0.005892 M, respectively. What is the equilibrium constant for the reaction below? 2 NH3(g) → N2(g) + 3 H2(g)
Tuesday, May 6, 2014 at 10:35am

chemistry
How much heat energy is needed to change the temperature of 25.00 mL of water from 5.0°C to 75.0°C? The molar heat capacity of water for this process Cp = 75.38 J/(mol °C), d = 1.00 g/mL.
Tuesday, May 6, 2014 at 8:44am

chemistry
A sample of oxygen gas is collected by displacement of water at 25°C and 1.17 atm total pressure. If the vapor pressure of water is 23.756 mm Hg at 25°C, what is the partial pressure of the oxygen gas in the sample?
Monday, May 5, 2014 at 11:25pm

Chemistry
A mixture consists of 0.52g of X, 0.77g of Y,and 1.11 g o fZ. What is the mass % of Z in the mixture?
Monday, May 5, 2014 at 10:59pm

Chemistry
Consider the following reaction at constant P. Use the information here to determine the value of ΔSsurr at 398 K. Predict whether or not this reaction will be spontaneous at this temperature. 4 NH3(g) + 3 O2(g) → 2 N2(g) + 6 H2O(g); ΔH = -1267 kJ A)ΔSsurr...
Monday, May 5, 2014 at 10:21pm

Chemistry
Zn+HCl---->ZnCl2+H2 If you measure the total volume of collected gas over water at 65*C to be 728 mL at a total pressure of 845 torr, how many milliliters of 2.6 HCl would be required to produce the correct amount of hydrogen?
Monday, May 5, 2014 at 9:57pm

Chemistry
Zn+HCl---->ZnCl2+H2 If you measure the total volume of collected gas over water at 65*C to be 728 mL at a total pressure of 845 torr, how many milliliters of 2.6 HCl would be required to produce the correct amount of hydrogen?
Monday, May 5, 2014 at 9:56pm

Chemistry
The fluoride ion concentration in a saturated solution of magnesium fluoride, MgF2, is 2.3 10-3 M. Calculate the value for the equilibrium constant.
Monday, May 5, 2014 at 9:20pm

Chemistry
Aniline, C6H5NH2, is a weak base. If the hydroxide ion concentration of a 0.201 M solution is 9.2 10-6 M, what is the ionization constant for the base?
Monday, May 5, 2014 at 9:19pm

Chemistry - Science (Dr. Bob222)
Posted by Ana on Saturday, May 3, 2014 at 11:23am. A zinc-copper battery is constructed as follows (standard reduction potentials given below): Zn | Zn2+ (0.10 M) || Cu2+ (2.50 M) | Cu Zn2+ + 2 e- → Zn(s) Eº = -0.76 V Cu2+ + 2 e- → Cu(s) Eº = 0.34 V The ...
Monday, May 5, 2014 at 9:19pm

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