Friday
July 29, 2016

Homework Help: Science: Chemistry

Recent Homework Questions About Chemistry

chemistry
a chemist dissolves kcl in water at constant temperature until no more kcl dissolves, how would you most accurately classify this solution, dilute, saturated, unsaturated or supersaturated?
Wednesday, March 9, 2016 by sidney betzler

chemistry
Given the following Unknown atoms with their respective atomic numbers, X; Atomic number 19, Y; Atomic number 15, a. Deduce the identities of the elements X and Y. b. What are the mass numbers of the two elements X and Y? c. Calculate the number of Neutrons in the respective ...
Wednesday, March 9, 2016 by bliss

chemistry
Given the equation below, if 3.87×1023 particles of Sb2S3(s) are reacted with excess Fe(s), what mass of FeS(s) is produced? Sb2S3(s) + 3Fe(s)→2Sb(s) +3FeS(s)
Wednesday, March 9, 2016 by bliss

chemistry
6. Given the equation below, how many moles of each reactant were there if 13.7 moles of N2(g) is produced? 4NH3(g) + 6NO(g)→5N2(g) + 6H2O(g)
Wednesday, March 9, 2016 by bliss

chemistry
3. For the reaction between Cu and Sn the potentials are given below; Cu2+(aq) +2e- -----------> Cu(s) Eºcathode = 0.34 (half-cell potential) Sn(s) -----------> Sn2+(aq) + 2 e- Eºanode = - 0.14 (half-cell potential) Calculate the E.M.F (Voltage) of the cell ...
Wednesday, March 9, 2016 by bliss

chemistry
3. For the reaction between Cu and Sn the potentials are given below; Cu2+(aq) +2e- -----------> Cu(s) Eºcathode = 0.34 (half-cell potential) Sn(s) -----------> Sn2+(aq) + 2 e- Eºanode = - 0.14 (half-cell potential)
Wednesday, March 9, 2016 by bliss

chemistry
2. The voltage of an electrochemical cell depends on the redox reaction occurring in the cell. Given a redox reaction below: Zn(s) + Pb2+(aq) --> Zn2+(aq) + Pb(s) Pb2+(aq) + 2 e--->Pb(s)Eº = -0.13V Zn2+(aq) + 2 e--->Zn(s)Eº = -0.76V Calculate the E.M.F (...
Wednesday, March 9, 2016 by bliss

chemistry
1. Given that 50 grams of ice is heated at -20.0 °C to steam at 135.0 °C. i. Show the graph of the changes from ice to steam ii. Calculate the energy needed to change the ice to steam Please use these values: Heat of fusion = 334.16 J g¯1 Heat of vaporization = ...
Wednesday, March 9, 2016 by bliss

chemistry
Calculate the change in pH when 9.00 mL of 0.100 M HCl(aq) is added to 100.0 mL of a buffer solution that is 0.100 M in NH3(aq) and 0.100 M in NH4Cl(aq). Calculate the change in pH when 9.00 mL of 0.100 M NaOH(aq) is added to the original buffer solution.
Wednesday, March 9, 2016 by james

Chemistry
how many atoms are there in 1.13 liters of hydrogen peroxide H2O2?
Wednesday, March 9, 2016 by Senni

Chemistry
I need help with this problem Which acid of those is used to destinguish between FeO and Fe2O3 a-HCl conc. b-HCl dil. C-H2SO4 conc. And how
Wednesday, March 9, 2016 by Asmaa khalaf

Chemistry
What is the maximum kinetic energy of an ejected electron if silver metal is irradiated with 228-nm light? The threshold wavelength for a silver metal surface is 267 nm.
Wednesday, March 9, 2016 by Anonymous

Organic chemistry
Limone (MW 136g/mol) is a pleasant smelling liquid found in lemon and orange peels. The boiling point of limonene is 175 ˚C, but it co-distills with water at 97.5 ˚C. If the vapour pressure of water at 97.5˚C is 690 mmHg, what percent (by mass) of the steam-...
Wednesday, March 9, 2016 by Laura

Chemistry
If only 1.31 grams of water are actually produced in the lab, what is the percent yield?
Tuesday, March 8, 2016 by Anonymous

Chemistry
Elemental sulfur occurs as octatomic molecules, S8. What mass of fluorine gas is needed for complete reaction with 24.1 g sulfur to form sulfur hexafluoride? I don't know where to even start with this question
Tuesday, March 8, 2016 by Ashley

Chemistry
What is the equilibrium constant for a weak acid HA that dissociates 1% at an initial concentration of 0.05 M according to the following balanced chemical equation? HA <----> H+ + A-
Tuesday, March 8, 2016 by Student

Chemistry
A 100.00 ml of volume of 0.500 M HCl was mixed with 100.00 ml of 0.500 M KOH in a constant pressure calorimeter. The initial temperature of individual acid and base was 23.0 degree celsius. The final temperature after mixing was 25.5 degree celsius Given the specific heat of ...
Tuesday, March 8, 2016 by Payton

Chemistry-DrBob222
A 10.00 mL aliquot of 0.100 M NaOH is added to 15.00 mL of 0.100M HCl in a coffee cup calorimeter. The initial temperature of the two dilute liquids were both 25.0 degrees C and the final temperature of the mixture was found to be 37.8 degrees C. What is the (molar) heat of ...
Tuesday, March 8, 2016 by Student

Chemistry
Highest ionization energy to lowest I be ci f
Tuesday, March 8, 2016 by Anonymous

Chemistry
What is the shortest wavelength of light that can be emitted by a hydrogen atom that has an initial configuration of 7p1?
Tuesday, March 8, 2016 by Anonymous

Chemistry
Calculate the volume (in mL) of 0.627 M HNO3 needed to react completely with 8.12 g of BaCO3 in a gas-forming reaction
Tuesday, March 8, 2016 by Pat

Chemistry
What is the shortest wavelength of light that can be emitted by a hydrogen atom that has an initial configuration of 7p1?
Tuesday, March 8, 2016 by Anonymous

Chemistry
What is the maximum kinetic energy of an ejected electron if silver metal is irradiated with 228-nm light? The threshold wavelength for a silver metal surface is 267 nm.
Tuesday, March 8, 2016 by Anonymous

Chemistry
Balancing Equations Sucrose(C12H22O11) and oxygen produce a solid carbon, water and 3 units of carbon dioxide.
Tuesday, March 8, 2016 by Anonymous

Chemistry
Sucrose(C12H22O11) and oxygen produce a solid carbon, water and 3 units of carbon dioxide
Tuesday, March 8, 2016 by Jasmeen

Chemistry
What is the shortest wavelength of light that can be emitted by a hydrogen atom that has an initial configuration of 7p1?
Tuesday, March 8, 2016 by Anonymous

Chemistry
What is the shortest wavelength of light that can be emitted by a hydrogen atom that has an initial configuration of 7p1?
Tuesday, March 8, 2016 by Anonymous

Chemistry
Calculate the molarity of 3 drops (0.15mL) of a 0.5M Na3PO4 solution after adding 15 drops (.75mL) of water. (Presume drops are the same size, one drop = 0.05mL)((Presume volumes are additive)) So far I've figured .15g Na3PO4/163.94g/mol Na3PO4 = .0009moles .75g H20/18.015...
Tuesday, March 8, 2016 by Kevin

Chemistry
What is the maximum kinetic energy of an ejected electron if silver metal is irradiated with 228-nm light? The threshold wavelength for a silver metal surface is 267 nm.
Tuesday, March 8, 2016 by Anonymous

Chemistry-DrBob222
A piece of solid magnesium is reacted with hydrochloric acid to form hydrogen gas: Mg (s) + 2HCl (aq) ---> MgCl2 (aq) + H2 (g) What volume of hydrogen gas (in mL) is collected over water at 25 degrees Celsius by reaction of 0.450 g of Mg (AW= 24.3 g/mol) with 50.0 mL of 1.0...
Tuesday, March 8, 2016 by Student

Chemistry
Two gases are mixed in a 10.0L fixed volume flask: 8.0 L of O2 at 2.00 atm and 2.0 L of N2 at 3.00 atm. A) Calculate the partial pressure for each gas and the total pressure. I got ... PO2 = 1.60 atm PN2= 0.600 atm B) How much (volume in liters) argon at 5.0 atm must be added ...
Tuesday, March 8, 2016 by Student

Chemistry
Calculate the total heat required to vaporize 1.5 kg of water at 100oC to water vapor at 100oC?
Tuesday, March 8, 2016 by en1405

Chemistry
Two gases are mixed in a 10.0L fixed volume flask: 8.0 L of O2 at 2.00 atm and 2.0 L of N2 at 3.00 atm. A) Calculate the partial pressure for each gas and the total pressure. I got ... PO2 = 1.60 atm PN2= 0.600 atm B) How much (volume in liters) argon at 5.0 atm must be added ...
Tuesday, March 8, 2016 by Student

Chemistry
A piece of solid magnesium is reacted with hydrochloric acid to form hydrogen gas: Mg (s) + 2HCl (aq) ---> MgCl2 (aq) + H2 (g) What volume of hydrogen gas (in mL) is collected over water at 25 degrees Celsius by reaction of 0.450 g of Mg (AW= 24.3 g/mol) with 50.0 mL of 1.0...
Tuesday, March 8, 2016 by Student

Chemistry
Calculate the molarity of a solution which contains 0.40 mol of a substance dissolved in 1.6 L of a solution.
Tuesday, March 8, 2016 by Jasmine

chemistry
The mass of cao that can be prepared by heating 200g of caco3 which is 95 percent pure is
Tuesday, March 8, 2016 by sreeja

Chemistry
When solutions of two reactants were mixed in a coffee-cup calorimeter, the following temperatures were recorded as a function of time. Plot the data on one of the available pieces of graph paper. Obtain tf, the final temperature, by extrapolating to the time of mixing (time...
Tuesday, March 8, 2016 by Destany

Chemistry
Concentrated hydrochloric acid is 12 M. What is the molarity of an HCl solution prepared by diluting 10.0mL of concentrated acid to a total volume of 250.0mL?
Tuesday, March 8, 2016 by Sam

Chemistry
What is the maximum kinetic energy of an ejected electron if silver metal is irradiated with 228-nm light? The threshold wavelength for a silver metal surface is 267 nm.
Tuesday, March 8, 2016 by Anonymous

Chemistry
What is the shortest wavelength of light that can be emitted by a hydrogen atom that has an initial configuration of 7p1?
Tuesday, March 8, 2016 by Anonymous

Chemistry
How much concentrated 12 M HCl is needed to prepare 200 ml of a 2.5 M solution?
Monday, March 7, 2016 by Sam

chemistry
at some temperature, Keq=33 for the reaction H2 + I2 -> 2HI. If initially, [H2]= .0600 M and [I2]= .0300 M, what are all three equilibrium concentrations?
Monday, March 7, 2016 by seth

Chemistry
explain on a particle basis how the addition of a solute affects the boiling point, the freezing point, and the vapor pressure of the solvent.
Monday, March 7, 2016 by bubble dragon

chemistry
The ionization constant of HA is 1 × 10−6 . What must be the ratio of [A−] to [HA] for the preparation of a buffer solution with a pH of 6.49?
Monday, March 7, 2016 by Avery

Chemistry
A buffer is prepared by mixing 20 mL of .10 HOCl with 20 mL of .05 M NaOCl, and measure the pH to be 7.15. Using this information calculate the Ka for HOCl
Monday, March 7, 2016 by Avery

Chemistry
Classify the following type of stoichiometry problem: How many grams of zinc must react with an excess volume of hydrochloric acid to yield 0.500 g of zinc chloride? mass-mass problem mass-volume problem volume-volume problem mole-mole problem none of the above
Monday, March 7, 2016 by Jacquie

Chemistry
So if i have the equation 2 SO3 --> 2S + 3 O2 would my word equation for this be Sulfur Oxide --> Sulfur + Oxygen OR Sulfur hexaoxide --> Sulfur + hexaoxide or what would be the correct one if both are wrong? and for this one 2 KI + MgCI2 --> MgI2 + 2KCL Potassium ...
Monday, March 7, 2016 by Holfbrincl

Chemistry
why does the FeCl3 test positive for phenols and not other -OH compounds?
Monday, March 7, 2016 by Amber

Chemistry
A 10.0-g sample of solid NH4Cl is heated in a 5.00-L container to 900.°C. At equilibrium the pressure of NH3(g) is 1.51 atm. NH4Cl(s) mc011-1.jpg NH3(g) + HCl(g) The equilibrium constant, Kp, for the reaction is:
Monday, March 7, 2016 by Clare

Chemistry
Write a balanced chemical equation for this: The RXN of hydronium ion with solid calcium carbonate to form calcium and bicarbonate (HCO3-) ions.
Monday, March 7, 2016 by Student

11th chemistry
The chlorination of ethane gives a compound with the percent composition by mass of chlorine in the compound is 71.7% A) find the molecular formula of this compound B) write the condensed structural formulas of the isomers of this compound and give their names C) one of the ...
Monday, March 7, 2016 by angy

Chemistry
when a certain amount of calcium chloride (CaCl2) was dissolved 100.g of water, the boiling point rose from 100.0*C to 104.4*C; calculate the molality of this solution.
Monday, March 7, 2016 by James Dickenson

Chemistry
What is the mass of Na in 20g of Na2Co3
Monday, March 7, 2016 by Jenny

CHEMISTRY HELP
assume that 13.5g of AL react with excess HCl according to the following balanced equation, at STP: 2Al(s) + 6HCl(aq) ---> 2AlCl3 + 3H2(g) how mang liters of H2 at STP are produced?
Sunday, March 6, 2016 by Joe

Chemistry
Would glass, plastic or cardboard be best to store milk so the lactic acid doesn't increase?
Sunday, March 6, 2016 by Jen

Chemistry
1). Calculate the initial and final pH when 5.0, 10.0, and 100mL of 0.100M HCL is added to (a) 100mL of water (b) 100mL of a buffer which is 1.50M acetic acid and 1.20M sodium acetate 2). Develop a recipe for making this buffer from acetic acid, sodium hydroxide, and water
Sunday, March 6, 2016 by Nate

Chemistry
Exercise 14.55 Consider the reaction: NiO(s)+CO(g)⇌Ni(s)+CO2(g) Kc=4000.0 at 1500 K When calculating the answer, do not round to the appropriate number of significant figures until the last calculation step. If a mixture of solid nickel(II) oxide and 0.10000 M carbon ...
Sunday, March 6, 2016 by Nevaeh

Chemistry
Exercise 14.55 Consider the reaction: NiO(s)+CO(g)⇌Ni(s)+CO2(g) Kc=4000.0 at 1500 K When calculating the answer, do not round to the appropriate number of significant figures until the last calculation step..
Sunday, March 6, 2016 by Nevaeh

Chemistry
Name each compound by ionic, hydrogen, or molecular compound. And name the following? 1- P2O3 2 - MnO2 3 - Al2S3 4 - SO3 5 - NH3 6- SrI2 7 - CL2O5 8 - FeCl2 9 - BeH2
Sunday, March 6, 2016 by Julie

Chemistry
A flask of hydrogen gas is collected at 1.023 atm and 35 degrees C by displacement of water at 35 degrees C is 42.2 mm Hg. What is the partial pressure of hydrogen gas in the flask? Not exactly sure where to start with this question, or what formula to use. Thanks in advance
Sunday, March 6, 2016 by Ben

Chemistry
12 mL of 0.0100 M HCl are added to 25.0 mL of a buffer solution that is 0.010 M HC2H3O2 and 0.11 M C2H3O2-. What is the pH of the resulting solution? I understand to use the ice method, however, i do understand what to plug into the hh equation.
Sunday, March 6, 2016 by Lil

Chemistry
Organic nhi aati smjh... Koi smjhado na
Sunday, March 6, 2016 by Avril

Chemistry
12 mL of 0.0100 M HCl are added to 25.0 mL of a buffer solution that is 0.010 M HC2H3O2 and 0.11 M C2H3O2-. What is the pH of the resulting solution? I understand to use the ice calculations. I dont understand what to plug into the hh equation.
Sunday, March 6, 2016 by lil

chemistry
how many grams of NaOH are needed to neutralize 50 grams of H2SO4?
Sunday, March 6, 2016 by kumera

chemistry
what is the balanced chemical equation for "solid calcium hydrogen carbonate reacts with hydrochloric acid solution producing carbon dioxide,water and calcium ions solution"?
Sunday, March 6, 2016 by Anabeth

chemistry
Calculate the value of the thermodynamic equilibrium constant for the following reactions at 25.0 °C. (a) N2H4(g) + 2O2(g) 2NO(g) + 2H2O(g) Kp = H20=-228.6 NO= 86.69 N2H4= 159.3 02 = 0
Saturday, March 5, 2016 by Lia

chemistry
At 1500 °C, Kc = 5.67 for the reaction CH4(g) + H2O(g) CO(g) + 3H2(g) Calculated value of ΔG°1773 for the reaction at this temperature.
Saturday, March 5, 2016 by Ann

chemistry
Dr Bob, Thanks for your help. Ihad googled for 3 hours before asking you. For future reference, if anyone asks this question again, 10th grade chemistry, I found a video on You Tube that makes it easy to understand. It is, The Sci Guys, Ph indicator, acid-base indicator. ...
Saturday, March 5, 2016 by lulu

ANALYTICAL CHEMISTRY
A sample weighing 1.25 mg containing a certain compound M (FW 292.16 g/mol) was dissolved in solvent in a 5.00 mL volumetric flask. A 1.00 mL aliquot was drawn up, placed in a 10.00 mL volumetric and diluted to the mark with solvent. The absorbance of this solution at 340 nm ...
Saturday, March 5, 2016 by KAMBOYI K

chemistry
Calcium carbonate, CaCO3, when heated decomposes to calcium oxide and carbon dioxide. Calculate the mass of calcium oxide formed when 2.0 grams of CaCO3 is decomposed.
Saturday, March 5, 2016 by Unknown

chemistry
In the red cabbage lab, we just took the cabbage juice and in 5 separate cups mixed it with 5 different liquids, ex: coke, milk, cleaning agent, etc, and matched the color to a ph chart to tell if it was a base or an acid. Simple lab. The question needs a relatively simple ...
Saturday, March 5, 2016 by lulu

Chemistry
When perturbing the equilibrium with heating and cooling, how many times do you think the equilibrium can be shifted before it stops working? Why? How about modification of the equilibrium through changes in concentration?
Saturday, March 5, 2016 by Anonymous

Chemistry
I've been stuck on this question for awhile now. I'm having a lot of trouble figuring out how to start it. If you had added exactly 20.00 mL do d.i. water before the titration, calculate the molar concentration of OAc- would have been at the end of the titration. (...
Friday, March 4, 2016 by Rich

chemistry
how to find the mole ratio of salt to water of Mo(NO3)2.5H2O CaSO4.2H2O (CaSO4)2.H2O
Friday, March 4, 2016 by linda

chemistry
1. Given that 50 grams of ice is heated at -20.0 °C to steam at 135.0 °C. i. Show the graph of the changes from ice to steam ii. Calculate the energy needed to change the ice to steam Please use these values: Heat of fusion = 334.16 J g¯1 Heat of vaporization = ...
Friday, March 4, 2016 by bliss

chemistry
Consider the unbalanced reaction Ti(s) + Cl2(g) --> TiCl4(s) When 10.3 g of Ti react with 12.7 g of Cl2, 16.2 g of TiCl4 are obtained. The theoretical yield of TiCl4 is , the limiting reactant is and the percent yield is %. (Remember to use correct sig figs)
Friday, March 4, 2016 by Amanda

Chemistry
Explain the chemical changes that occur in the red cabbage lab that changes the color of the cabbage juice. I know it has something to do with the hydrogen ions and maybe something to do with the electrons, but I don't understand what or how to answer this question
Friday, March 4, 2016 by lulu

Chemistry
A solution is prepared by adding 45.0g of Na2SO4*6H2O to pure water to make 150mL of solution. What are molar concentrations of these ions in the resulting solution? Sodium Ion? Sulfate Ion? Phosphate Ion? I've determined the solution is 1.2M 45/250.16g/mol Na2SO4*6H2O = ....
Friday, March 4, 2016 by Kevin

Chemistry
Using your knowledge of chemical migration, outline the two most possible chemical migration pathways for non-polar C9H12 that has been spilled onto an open field on a warm spring day.
Friday, March 4, 2016 by Nick

Chemistry 101
In addition to uranium, which elements were known to emit radioactive "rays" before M. Curie discovered radium?
Friday, March 4, 2016 by Lilly

Chemistry 101
If the curries were able to extract 8.5ug of radium from 8.5 tons of pitchblende, what was their rate of recovery? (in percent please)
Friday, March 4, 2016 by Lilly

Chemistry 101
How many evaporation's did the curies have to make before they finally isolated radium?
Friday, March 4, 2016 by Lilly

Chemistry 101
This is the question 10.0 grams of nitrogen is reacted with 10.0 grams of the element phosphorus under certain conditions to yield trinitrogen diphosphide. Answer these questions. 1). Write a balanced equation. 2). which reactant is limiting? In excess? 3). Theoretically, how ...
Friday, March 4, 2016 by Lilly

Chemistry 101
If a solution containing 20.0 grams of nickle (11) chloride is mixed with an aqueous solution of containing 15.0 grams of silver nitrate,, determine the mount of silver chloride that theoretically will precipitate. How much nickle (11) nitrate is formed? Which reactant is ...
Friday, March 4, 2016 by Lilly

CHEMISTRY
Given: 3H2(g) + N2(g) 2NH3(g) If the reaction starts with 0.500 mol of H2, how many atoms of hydrogen in the compound NH3 would you expect to make?
Friday, March 4, 2016 by LUNGILE

chemistry
Given: 3H2(g) + N2(g) 2NH3(g) If the reaction starts with 0.500 mol of H2, how many atoms of hydrogen in the compound NH3 would you expect to make?
Friday, March 4, 2016 by LUNGILE

Chemistry 101
10.0 grams of nitrogen is reacted with 10.0 grams of the element phosphorus under certain conditions to yield trinitrogen diphosphide. Answer these questions. 1). Write a balanced equation. 2). which reactant is limiting? In excess? 3). Theoretically, how many grams of ...
Friday, March 4, 2016 by Lilly

Chemistry 101
If a solution containing 20.0 grams of nickle (11) chloride is mixed with an aqueous solution of containing 15.0 grams of silver nitrate,, determine the mount of silver chloride that theoretically will precipitate. How much nickle (11) nitrate is formed? Which reactant is ...
Friday, March 4, 2016 by Lilly

Chemistry
How many grams of solute are in 0.504 L of a 0.350 M K2CO3 solution?
Friday, March 4, 2016 by msid

Chemistry
Explain, in terms of collision theory, how and why a reaction’s rate changes as the reaction progresses.
Friday, March 4, 2016 by nan

chemistry
what chemical changes are responsible for the color changes in the red cabbage lab?
Friday, March 4, 2016 by lulu

Chemistry
Determine the rate law, including the values of the orders and rate law constant, for the following reaction using the experimental data provided. Q + X yields products Trial [Q] [X] Rate 1 0.12 M 0.10 M 1.5 × 10-3 M/min 2 0.24 M 0.10 M 3.0 × 10-3 M/min 3 0.12 M 0....
Friday, March 4, 2016 by nan

Chemistry
A match must be struck against an object to produce a spark to start the burning process. Once the match starts burning, it releases a large amount of energy. Describe, in detail, what the potential energy diagram would look like for the burning of a match, and explain how ...
Friday, March 4, 2016 by nan

Chemistry
How does the potential energy of the reactants compare to the potential energy of the products in an exothermic reaction, and where does the energy that is given off come from? Explain your answer in complete sentences.
Friday, March 4, 2016 by nan

Chemistry
Which reaction did you perform in the hands-on activity? Describe the chemical combination that you investigated. Also describe any observations from the investigation, including the temperature change of the container.
Friday, March 4, 2016 by nan

Chemistry
Ascorbic acid is a compound containing of three element C,H, and O when a 0.214g sample is burned in oxyzen 0.320g of CO2 and 0.0874g H2O are formed. What is the Empirical formula of ascorbic acid?
Thursday, March 3, 2016 by Asifur

chemistry
2.) If the volume of a gas at -73 degrees celcius is doubled while pressure is held constant, what will be its final temperature in degrees celsius? 5.) A gas storage tank at a large industrial plant is designed to provide fuel under constant pressure. When the plant is shut ...
Thursday, March 3, 2016 by Zoey

chemistry
what mass of CdS is produced if 4.55g of cadmium reacts with 2.00g of sulfur?
Thursday, March 3, 2016 by tim

Chemistry
Write an overall balanced equation for these unbalanced half-reactions: In --> In3+ Cd2+ --> Cd I multiplied both sides by integers to get the electrons to be equal on both sides but I don't know what the final overall balanced equation looks like.
Thursday, March 3, 2016 by Blake

Chemistry
Mole calculations: How much does 2.5 x 10^24 molecules of p2o3 weigh ?
Thursday, March 3, 2016 by Aria

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