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July 1, 2016

Homework Help: Science: Chemistry

Recent Homework Questions About Chemistry

Chemistry
2zN reacts with O2 to produce 2ZnO, HOW MANY GRAMS OF ZINC OXIDE CAN BE PRODUCED FROM 2.75 G OF OXYGEN?
Thursday, March 26, 2015 by Ashten

please help Chemistry
Zn(OH)2 was saturated in a solution of sodium hydroxide. The following equilibra exist under these conditions Zn(OH)2 -> Zn2+ +2OH- Ksp Zn2+ +OH- -> Zn(OH)+ K1 Zn(OH)- + OH- -> Zn(OH)2 K2 Zn(OH)2 + OH- -> Zn(OH)3- K3 Zn(OH)3- +OH- -> Zn(OH)42- K4 a) Sum of which...
Thursday, March 26, 2015 by george

Chemistry
How many kg of Glaubers salt (Na2SO4. 10 H2O) will be obtained from 250 kg of Na2SO4
Thursday, March 26, 2015 by Man Singh Chouhan

chemistry
value and formula Ksp Of : -PbI2 -CdS -Ca(OH)2 -Ag2CrO4 -Cu2S
Thursday, March 26, 2015 by ahmad

practical chemistry
perform a qualitative analysis test on ZnSO4 showing ur observations and inference
Thursday, March 26, 2015 by augustine eze

Chemistry
8. A chemist vaporized a liquid compound and determined its density. If the density of the vapor at 90 ºC and 753 mmHg is 1.585 g/L, what is the molecular weight of the compound?
Thursday, March 26, 2015 by nona

chemistry
7. Calculate the density of hydrogen sulfide, H2S, at 56 ºC and 967 mmHg. (Express density in g/L)
Thursday, March 26, 2015 by nona

chemistry
Zn(OH)2 was saturated in a solution of sodium hydroxide. The following equilibra exist under these conditions Zn(OH)2 -> Zn2+ +2OH- Ksp Zn2+ +OH- -> Zn(OH)+ K1 Zn(OH)- + OH- -> Zn(OH)2 K2 Zn(OH)2 + OH- -> Zn(OH)3- K3 Zn(OH)3- +OH- -> Zn(OH)42- K4 a) Sum of which...
Thursday, March 26, 2015 by george

AP Chemistry
A buffered solution was created by mixing solutions of NH4Cl and NH3 at 25 C. Which species, NH4+ or NH3, has the highest concentration in this buffered solution?. Justify your answer.
Thursday, March 26, 2015 by Sara

Chemistry
Tungsten trioxide (WO3) has a rich yellow color and is often used as a pigment in ceramics and paints. In order to test a ceramic vase for its WO3 content, a 10.20 g sample of the vase was ground and reduced with Pb(Hg) to convert any WO3 to W3 . The resulting W3 was ...
Wednesday, March 25, 2015 by Cassie

Chemistry
A 15.0 mL sample of whiskey was diluted to 500.0 mL. A 3.00 mL aliquot of the diluted sample was removed and the ethanol, C2H5OH, was distilled into 50.00 mL of 0.02400 M K2Cr2O7 and oxidized to acetic acid. The excess Cr2O72– was then back titrated with 19.0 mL of 0.1255...
Wednesday, March 25, 2015 by Cassie

chemistry
Using each of the following equations, calculate the number total of moles of products that can be obtained through decomposition of 1.75 moles of the reactant? a. 2 NH4NO3---> 2 N2 + O2 + 4 H2O b. 2 NaClO3---> 2 NACl + 3 O2 answers are 6.12 and 4.38 but i don't ...
Wednesday, March 25, 2015 by jason

Chemistry
A party-supply store sells a helium-gas cylinder with a volume of 1.55 × 10^-2 m^3. If the cylinder provides 1.81 m^3 of helium for balloon inflation (at STP), what must be the pressure inside the cylinder? Now I don't understand this at all. My book does not explain...
Wednesday, March 25, 2015 by Cade

chemistry
7.5 gm of chromium and 7.5 grams oxygen yield
Wednesday, March 25, 2015 by Elizabeth

college chemistry
calculate the solubility of SrF2 (ksp=7.9E-10) in 0.100 M Sr(NO3)2 ? The answer is 4.44E-5 M how do you get that? I Have no clue I saw the setup but it doesnt get 4.44E-5 M
Wednesday, March 25, 2015 by JF

chemistry
50.0 mL of an unknown HCl solution was titrated with 0.449 M NaOH. To reach the equivalence point, 38.4 mL of the NaOH was used. What was the concentration of the HCl?
Wednesday, March 25, 2015 by james

chemistry
An equilibrium mixture of N2, H2, and NH3 at 700 K contains 0.031 M N2 and 0.52 M H2. At this temperature, Kc for the reaction is 0.29. What is the concentration of NH3? N2(g) + 3H2(g) (equilibrium arrow) 2NH3(g)
Wednesday, March 25, 2015 by Anonymous

chemistry
calculate the solubility of SrF2 (ksp=7.9E-10) in 0.100 M Sr(NO3)2 ? The answer is 4.44E-5 M how do you get that? I Have no clue?
Wednesday, March 25, 2015 by JF

Chemistry CP
Water has a much higher specific heat capacity than most liquids. Explain in terms of the attractive forces between water molecules.
Wednesday, March 25, 2015 by Jill

chemistry cp
rank the following compiunds in order of increasing boiling points. a. CO b. C2H6 c. NH3
Wednesday, March 25, 2015 by susie

chemistry
which of the following molecules will exhibit hydrogen bonding? a. CH3OCH3 b. HF c. CH4 d. LiH
Wednesday, March 25, 2015 by john

Chemistry
1. What would be the effect on the reaction rate if the [O2] were doubled? 2. What would be the effect on the reaction rate if the pressure on the reaction were doubled? 3. Assume the reaction is reversible and at equilibrium. What shifts in the equilibrium of this reaction ...
Wednesday, March 25, 2015 by Jojo

chemistry
200 ml of h2o is added to 400ml (m/10) of hcl solution. Find the pH of final solution?
Wednesday, March 25, 2015 by pinku kr

Chemistry
If I have pH of lemon juice that is 2.3 after I dilute it with 9 cups of water, what is the pH and how do I figure it out?
Wednesday, March 25, 2015 by char

chemistry
Calculate the volume occupied by 3moles of a gas at r.t.p
Wednesday, March 25, 2015 by mwamba

chemistry
If 0.50 moles of NaOH were added to reach the equivalence point in a titration how many miles of tartaric acid reacted?
Wednesday, March 25, 2015 by leandra

Chemistry
A phosphate buffer solution contain 0.08 M K2HPO4 and 0.12 M KH2PO4. pKa values for H3PO4 are 2, 6.8, and 12.2. Calculate the concentrations of a) H3PO4 b) H2PO4- c) HPO42- d) H+ e) OH- f) K+
Wednesday, March 25, 2015 by James Alonso

chemistry
A spark plug fires before the gases in a cylinder are fully compressed. How will the engine be affected? A. The engine will get better gas mileage as less fuel is burned during each cycle. B. There will be fewer pollutants as the fuel has more time to burn. C. The gases will ...
Wednesday, March 25, 2015 by Cortney

chemistry
If it takes 30 seconds for a reactant concentration to decrease from 1.0 M to 0.5 M in a first-order chemical reaction, then what is the rate constant for the reaction? A. 43 s–1 B. 0.046 s–1 C. 0.023 s–1 D. 0.033 s–1
Wednesday, March 25, 2015 by Cortney

chemistry
How can the overall order of a reaction be determined? A. Add the exponents in an equilibrium constant expression. B. Add the coefficients in the balanced equation. C. Count the number of different reactants. D. Examine experimental data for the reaction over time.
Wednesday, March 25, 2015 by Cortney

Chemistry
A student tested the effect of temperature on the decomposition of N2O5. He found that the rate of the reaction at a lower temperature was 4.2 x 10–3 s–1 and the rate at a higher temperature was 1.6 x 101 s–1. What is wrong with the student's data? A. ...
Wednesday, March 25, 2015 by Cortney

chemistry
Trying to calculate atoms of O in 2.00 moles of H3PO4.I used 2.00 mol h3po4÷4atoms O then × by 6.022 avrogados# My answer 3.011×10^23
Wednesday, March 25, 2015 by jackson

Chemistry
1) How would you expect the solubility of the following to vary n a series of solutions of increasing ionic strength created by adding KNO3 a) ammonia b) ammonium chloride 2) If the ionic strength was increased by adding KCl, the solubility of which one of the above two ...
Wednesday, March 25, 2015 by Katrina

chemistry
A particular weak acid (HA) with a Ka of 2.0e-5 is 75% titrated with a strong base to produce a buffer solution. What is the pH of this final solution? Show all work.
Tuesday, March 24, 2015 by Nicole

Chemistry
Refer to the table given for the ionic radii in your lab manual and approximate the attractive portion of the lattice energy for 1 mole of the following salts. (Consider only one bond if more than one bond exists.) a) PbS2 b) Ca3P2 c)Ca3N2
Tuesday, March 24, 2015 by Anonymous

Chemistry
A voltaic cell operates with 0.40 M Zn 2+ at the solid zinc anode and 1.45 M Zn2+ at the solid zinc cathode at 25 C. Is the reaction thermodynamically favored?
Tuesday, March 24, 2015 by Anonymous

chemistry
A spark plug fires before the gases in a cylinder are fully compressed. How will the engine be affected? A. The engine will get better gas mileage as less fuel is burned during each cycle. B. There will be fewer pollutants as the fuel has more time to burn. C. The gases will ...
Tuesday, March 24, 2015 by Cortney

chemistry
What volume of nitrogen gas at STP can form from 1.20 mol NaN3? 2NaN3(s) 2Na(s) + 3N2(g) A. 40.3 L B. 1.20 L C. 13.4 L D. 1.80 L
Tuesday, March 24, 2015 by Cortney

chemistry
Refer to the table given for the ionic radii in your lab manual and approximate the attractive portion of the lattice energy for 1 mole of the following salts. (Consider only one bond if more than one bond exists.) (a) SrO
Tuesday, March 24, 2015 by Anonymous

Chemistry
What volume of carbon dioxide is produced when 7.5g of butane react with 19g of oxygen gas at 74 degrees celsius at 550 torr?
Tuesday, March 24, 2015 by Rose

Chemistry
How many moles of gas will occupy 6.75 m3 at 65.0°C and 3.28 x 105 Pa? A. 7.98 x 104 mol B. 4.10 x 103 mol C. 7.88 x 102 mol D. 4.15 x 105 mol
Tuesday, March 24, 2015 by Cortney

Chemistry
Zn(OH)2 was saturated in a solution of sodium hydroxide. The following equilibra exist under these conditions Zn(OH)2 -> Zn2+ +2OH- Ksp Zn2+ +OH- -> Zn(OH)+ K1 Zn(OH)- + OH- -> Zn(OH)2 K2 Zn(OH)2 + OH- -> Zn(OH)3- K3 Zn(OH)3- +OH- -> Zn(OH)42- K4 a) Sum of which...
Tuesday, March 24, 2015 by Troy

Chemistry
There is a picture of a brick lying face down and one standing straight up. The question asks: Is each brick exerting the same force? Explain. I know that they are exerting the same force, but I don't understand why and how to explain it?
Tuesday, March 24, 2015 by Jessica

Chemistry
Step 1: A 12.70mL sample of cyanide solution was mixed with 25.00mL of a solution of nickel ions at an appropriate pH to form the Ni-cyanide complex. The resulting solution was titrated cs 0.0130M EDTA and required 10.10mL to reach the end point. Step 2: Then 30.00mL of the ...
Tuesday, March 24, 2015 by Catherine

Analytical Chemistry
For a triprotic acid H2PO4. Ka1=7.11e-3, Ka2=6.32e-8 and Ka3=7.1e-13. 50mL each of 0.05F CaCl2 and 0.05F phosphoric acid were mixed. Ksp CaHPO4=2.6e-7. a) Would CaHPO4 precipitate when phosphoric acid and calcium chloride were mixed together? b) List all species (ions, ...
Tuesday, March 24, 2015 by Mia

Cultural Anthropology
DESCRIBE 2 REASONS WITH EXAMPLES WHY IT IS IMPORTANT TO HAVE A STRICT CODE OF ETHICS IN ANTHROPOLOGY AND OTHER SOCIAL SCIENCES COMPARED TO MORE SCIENTIFIC DISCLIPLINES SUCH AS CHEMISTRY OR PHYSICS My textbook is Cultural anthroplogy by barbra miller and i can't find ...
Tuesday, March 24, 2015 by breeamberr

chemistry
One gram of pbcl2 is dissolved in 1.0 l of hot water. When the solution is cooled to 25degrees Celsius, will some of the pbcl2 crystallize out? If so, how much? I just don't know where to start/ where to go with this problem Any help is appreciated!!
Tuesday, March 24, 2015 by Anonymous

Chemistry
The amino acid glycine, C2H5NO2, is one of the compounds used by the body to make proteins. The equation for its combustion is 4C2H4NO2(s)+9O2(g)---> 8CO2(g)+10H2O(l)+2N2(g) For each mole of glycine that burns, 973.49 kJ of heat is liberated. Use this information, plus ...
Tuesday, March 24, 2015 by Please check answer

chemistry
A spark plug fires before the gases in a cylinder are fully compressed. How will the engine be affected? A. The engine will get better gas mileage as less fuel is burned during each cycle. B. There will be fewer pollutants as the fuel has more time to burn. C. The gases will ...
Tuesday, March 24, 2015 by Cortney

Chemistry
In the recovery of iron from iron ore, the reduction of the ore is actually accomplished by reactions involving carbon monoxide. Use the following thermochemical equations, Fe2O2(s) + 3CO(g) ---> 2Fe(s) +3CO2(g) ΔH° = -28kJ 3Fe2O2(s) + CO(g) ---> 2Fe3O4(s)+ CO2(...
Tuesday, March 24, 2015 by Lenny

chemistry
The molecules of which gas have the greatest velocity at 120°C? A. O2 B. CO2 C. NH3 D. Cl2
Tuesday, March 24, 2015 by Cortney

chemistry
Which of the following is not a physical property of gases? A. Low density B. No thermal expansion C. No fixed shape D. Compressibility I believe the answer is B
Tuesday, March 24, 2015 by Cortney

Chemistry
Sulfuric acid can dissolve aluminum metal according to the following reaction. 2Al(s)+3H2SO4(aq)→Al2(SO4)3(aq)+3H​2(g) Suppose you wanted to dissolve an aluminum block with a mass of 24.4g . What minimum amount of H2SO4 in grams would you need?
Tuesday, March 24, 2015 by Kelsey

Chemistry
Methane burns with oxygen to produce carbon dioxide and water as a gas. The balanced thermochemical equation is Ch4(g) + 2)2(g) ---> CO2(g) + 2H2O(g) H = -802kJ How much methane, in grams, must be burned to release 544 kJ of heat? My answer: 544/802 = 0.678 0.678*16= 10....
Tuesday, March 24, 2015 by Is my right correct?

chemistry
how much ml of concentrated hci required to make 0.5N hcl solution? /
Tuesday, March 24, 2015 by Ashwin

college chemistry
solid diarsenic trioxide reacts with Flourine gas to produce liquid arsenic pentaflouride and oxygen gas. Write the Qc for this reaction
Tuesday, March 24, 2015 by Mia

chemistry
the combustion of co2 gives -393.5kj/mol calculate the heat of formation of 35.2grams of co2
Tuesday, March 24, 2015 by shankar

Chemistry
How many mL of HCl solution are required to change pH from 2.67 to 9.25?
Tuesday, March 24, 2015 by Rhonda

Chemistry
Estimate the solubility of TISCN in a solution of which ionic strength is 1.265e-2M at 25 degree and Ksp=1.6e-4. I do not know why Prof. gives me ionic strength? In the next question, Prof. said " For a sparingly soluble ionic compound of type AB the solubility can be ...
Tuesday, March 24, 2015 by Lyna

chemistry
How would you make 1L of a buffer of pH=11 starting with 15g of base, C5H11N:. At you disposal are 1M HCl and 1M NaOH, pH meter, balance, distilled water and glassware. Try to be quantitative in expressing amounts of material that you will use. Given for C5H11NH+ pKa=11.25. ...
Tuesday, March 24, 2015 by Katy

chemistry
What are the parameters of a sample of gas that are all interrelated and affect each other when any one of them changes? A. Pressure, volume, number of moles, and temperature B. Shape, hardness, transparency, and odor C. Mass, density, color, volume, and pressure D. ...
Tuesday, March 24, 2015 by Cortney

chemistry
There are 5.00*10^-3 moles of lead II nitrate. Calculate how man grams this is.
Tuesday, March 24, 2015 by akihito

Chemistry
Which properties of a gas increase linearly as the temperature is increased? A. Volume and density B. Volume and pressure C. Amount of gas and density D. Amount of gas and volume I believe the answer is A or D But I am pretty sure the answer is a
Monday, March 23, 2015 by Cortney

Chemistry
A spark plug fires before the gases in a cylinder are fully compressed. How will the engine be affected? A. The engine will get better gas mileage as less fuel is burned during each cycle. B. There will be fewer pollutants as the fuel has more time to burn. C. The gases will ...
Monday, March 23, 2015 by Cortney

Chemistry
The standard heat of combustion of eicosane, C20H42 (s), a typical component of candle wax, is -1.332 x 104 kJ/mol (consider this number to be exact in your calculations), when it burns in pure oxygen, and the products are cooled to 25°C. The only products are CO2 (g) and ...
Monday, March 23, 2015 by Anonymous

Chemistry
100 ml of 15 g/L silver nitrate reacts with an unknown concentration solution of copper (ll) chloride. the reaction for me only 2 grams of silver (l) chloride. If 75 mL of the copper (ll) chloride solution was mixed in, what is the initial concentration of the solution?
Monday, March 23, 2015 by Hannah

chemistry
During which stroke of a four-stroke internal combustion engine is work done to the system of gases? A. Exhaust stroke B. Intake stroke C. Compression stroke D. Power stroke
Monday, March 23, 2015 by Cortney

chemistry
You have to prepare a pH 5.00 buffer, and you have the following 0.10M solutions available: HCOOH, HCOONa, CH3COOH, CH3COONa, HCN, and NaCN. Which solutions would you use? HCOOH HCOONa CH3COOH CH3COONa HCN NaCN
Monday, March 23, 2015 by Raj

Chemistry
Gases can be differentiated from solids and liquids because gases have: A. reduced chemical reactivity. B. no color. C. average densities on the order of 10-3 g/mL. D. a spherical shape. I think the answer is C or D.
Monday, March 23, 2015 by Cortney

Chemistry
Titration of Na2CO3 with HCl. (pKa1(H2CO3) = 6.352, pKa2(H2CO3) = 10.329) . Calculate the pH at each of the following volumes of 0.20 M HCl added to 20.00 mL of 0.10 M Na2CO3. I figured out everything except for adding 20.00 ml of 0.20M HCL. Please help asap.
Monday, March 23, 2015 by Robin

chemistry
Which properties of a gas increase linearly as the temperature is increased? A. Volume and density B. Volume and pressure C. Amount of gas and density D. Amount of gas and volume I believe the answer is A or D But I am pretty sure the answer is a
Monday, March 23, 2015 by Cortney

Chemistry (Aspirin Synthesis- Unreacted SA
To determine the yield of your ASA synthesis, you can quantify the amount of unreacted SA Weigh out 0.15 g of your crude ASA into a clean tared 7 mL vial. Record exact mass. 2) Add 5 mL ethanol. 3) Cap vial and mix well. 4) Transfer the above solution into a 50 mL volumetric ...
Monday, March 23, 2015 by Maxine

Chemistry
Which of the following best applies to the pressure of a gas? A. It is the force per unit volume. B. It decreases with temperature. C. It increases with volume. D. It is the sum of the collisions of the molecules. Is it a or d.
Monday, March 23, 2015 by Cortney

chemistry help
If the standard calcium carbonate solution is 100 ppm and 25 mL of solution is used for the standardization, calculate the approximate volume of 2mM EDTA solution needed to reach the end point of the titration. I know to use M1V1=M2V2 but need help converting units of ...
Monday, March 23, 2015 by paula

chemistry
A solution is made by containing 15 mL of 17.5 M acetic acid with 5.52 g of sodium acetate and diluting to total volume of 1.50 L. Calculate the pH
Monday, March 23, 2015 by Gabby

Chemistry
A solution is made by containing 15 mL of 17.5 M acetic acid with 5.52 g of sodium acetate and diluting to total volume of 1.50 L. Calculate the pH
Monday, March 23, 2015 by Gabby

General Chemistry
What is the concentration in ppm of Ag in a 245 lb of Ore that contains 83.5g of silver?
Monday, March 23, 2015 by MJ

CHEMISTRY
Two gases A and B having the same volume diffuse through a porous in 20 and 10 seconds respectively .The molecular mass of A is 49u.Molecular mass of B will be
Monday, March 23, 2015 by Tanya

chemistry
1)Thallium (I) is oxidized by cerium (IV) as follows: Tl+ + 2 Ce+4  Tl+3 + 2 Ce+3 The elementary steps, in the presence of Mn(II), are as follows: Step 1 Ce+4 + Mn+2 --- Ce+3 + Mn+ Step 2 Ce+4 + Mn+3 ---- Ce+3 + Mn+4 Step 3 Tl+ + Mn+4 ----- Tl+3 + Mn+2 (a) Identify the...
Sunday, March 22, 2015 by treasa

chemistry
I'm having trouble balancing this equation in a basic solution. Cr(OH)3 + Br2 -----> CrO4{2-} + Br{-} Do I do start this with half reactions Thanks
Sunday, March 22, 2015 by Stacie

Chemistry, pre Algebra
Glycopyrrolste comes in quantity of 25 vials and has an AWP of $135.the store has an agreement with the contractor to purchase that chemical at the AWP minus 10% the insurer is willing to pay the AWP plus 3 % plus a $4 dispensing fee. a patient on this ensures plan purchases 5...
Sunday, March 22, 2015 by Kate

Chemistry help
Why it is important for there to be no further bubbling before the final mass of the reaction beaker is obtained?
Sunday, March 22, 2015 by Anonymous

Chemistry help
Why is it important for the reaction beaker to be completely dry before weighing?
Sunday, March 22, 2015 by Anonymous

Chemistry
A sodium chloride solution has a density of 1.22 g/mL. How many moles of NaCl are dissolved in 10.0 mL of the solution? The density of water is 1.00 g/mL. My solution: ? mol NaCl = 10 mL*1.22 g/1mL*1mL/58.5g The correct answer is 3.76E-2 mol. Please help!
Sunday, March 22, 2015 by Anonymous

Chemistry
Determine the number of molecules of the compound iron phosphate with 129.68 g Fe3(PO4)2
Sunday, March 22, 2015 by Sheila

chemistry
Consider the reaction 2 NO2 (g) ⇌ 2 NO (g) + O2 (g). If the initial partial pressure of NO2 (g) is 3.0 bar, and x is the equilibrium pressure of O2 (g), what is the correct equilibrium relation?
Sunday, March 22, 2015 by lee

Chemistry
I found this on the internet and I need an explanation. Q: You want to make sure a large weather balloon does not burst and wish to check the temperature at 3000 meters altitude. The balloon manufacture guarantees the balloon up to 60.0 Liters in size. Will the balloon make it...
Sunday, March 22, 2015 by Jane

general chemistry
How many grams of NaOH are required to prepare 250 mL of 0.205 M NaOH? SHOW ALL WORK and include units. I don't know how to set this up.
Sunday, March 22, 2015 by cassie

chemistry
Write a balanced chemical equation for the neutralization reaction between aqueous hydrochloric acid and aqueous calcium hydroxide. Be sure the formulas are written correctly before balancing, and include phases. HCl+H2CaO2 im not sure that's written correctly but that is ...
Sunday, March 22, 2015 by jessica

Chemistry
A sodium chloride solution has a density of 1.22 g/mL. How many moles of NaCl are dissolved in 10.0 mL of the solution? The density of water is 1.00 g/mL. My solution: ? mol NaCl = 10 mL*1.22 g/1mL*1mL/58.5g The correct answer is 3.76*10^2 mol. Please help!
Sunday, March 22, 2015 by Anonymous

Chemistry
If there are 57.6 mL of water that change from 19.4 degrees Celsius to 34.7 degrees Celsius, calculate the number of joules of energy transferred in the form of heat. Round to the nearest whole number. The specific heat capacity of water is 4.18 J/g*C and density of water is 1...
Sunday, March 22, 2015 by Alex

Chemistry
0.24g of a volatile substance,upon vaporisation,gives 45ml vapour at NTP what will be the vapour density of the substance?
Sunday, March 22, 2015 by Tanya

CHEMISTRY
The average kinetic energy of an ideal gas,per molecule in S.I units at 25°C will be
Sunday, March 22, 2015 by Tanya

CHEMISTRY
At 25°C and 730 mm pressure,380 ml of dry oxygen was collected.If the temperature is constant ,what volume will the oxygen occupy at 760 mm pressure ? ANSWER- 365ml
Sunday, March 22, 2015 by Tanya

CHEMISTRY
The pressure exerted by 6.0g of methane gas in a 0.03m3 vessel at 129degreeC is.
Sunday, March 22, 2015 by Tanya

CHEMISTRY
A gaseous mixture was prepared by taking equal mole of CO and N2 .if the total pressure of the mixture was found 1 atmosphere ,the partial pressure of nitrogen (N2) in the mixture is.
Sunday, March 22, 2015 by Tanya

Chemistry
A 20.00 mL sample of a .1000M unknown acid solution is titrated with .1000M NaOH. Given that the acid is diprotic and its pKa's are 1.90 and 6.70 a.) Estimate the pH after 10 mL of base are added b.) estimate the pH after 20 mL of base are added c.) estimate the pH after ...
Sunday, March 22, 2015 by lawerence

Chemistry
Can someone please answer one of these question so I would be able to know how to do the others? 1. What volume of 0.275 M KOH (aq) must be added to 75.0 mL of 0.137 M H3AsO4 (aq) to reach (a) the first stoichiometric pony; (b) the second stoichiometric point 2. What volume of...
Sunday, March 22, 2015 by Anonymous

Chemistry
If 20dm3 methane was burned in pure oxygen: CH4(g) + 2O2(g) arrow CO2(g) + 2H2O(l) how do I work out the volume of carbon dioxide made? And what volume of oxygen would be required? Thank you.
Sunday, March 22, 2015 by Maria

Chemistry
How many milliliters of 0.258 M NiCl2 solution are needed to react completely with 20.0 mL of 0.153 M Na2CO3 solution? How many grams of NiCO3 will be formed? The reaction is Na2CO3(aq) +NiCl2 (aq)----> NiCO3(s)+2NaCl I solved for the 1st part, 11.8 M NiCl2 I am not sure ...
Sunday, March 22, 2015 by Stacie

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