Jude

What mass of propanoic acid, CH3CH2COOH, pKa= 4.87, should be dissolved in water to 2.00L volume in order to produce a pH of 2.50? THANKS! -J

16 years ago

At what initial concentration would a solution of acetic acid (ka=1.8x10^-5) be 2% ionized? THANKS! -J

16 years ago

At what initial concentration would a solution of acetic acid (ka=1.8x10^-5) be 2% ionized? I am stuck. Thanks -J

16 years ago

When 24.0g og glucose(a nonelectrolyte) are dissolved in 500g of water, the solution has a freezing point of -0.47C. What is the molar mass of glucose according to yhe data?Kf of water is 1.86C/m.

15 years ago

The density of a solution of 3.69g KBr in 21.70g H2O is 1.11g/mL. What is the molarity of KBr in the solution.

15 years ago

What is the mole fraction of methyl n-butyrate CH3(Ch2)2COOCH3 in the vapor phase of a solution consisting of? a mixture of methyl n-butyrate and ethyl acetate CH3COOCH2CH3 at 50 Celsius if the total pressure above the solution is 192.5 torr. The vapor pr...

14 years ago

How many grams of carbon tetrachloride CCL4 must be mixed with 35.96g of ethyl acetate CH3COOCH2CH3 at 50? celsius to produce a solution with a vapor pressure above the solution of 291.8 torr. The vapor pressure of pure carbon tetrachloride and ethyl acet...

14 years ago

The vapor pressure of pure water at 85 celsius is normally 433.6 mmHg but decrease to 393.8mmHg upon addition? of an unknown amount of ammoniu chloride NH4Cl to 162.2g of water at this temperature. How many grams of ammonium chloride were added assuming c...

14 years ago

Which of the following will have the smallest freezing point depression? 0.1158 m NaF 0.1158 m Na2SO4 0.1158 m K2SO4 0.1158 m Fe(NO3)3

14 years ago

Why would an alcohol/water mixure not freeze at constant temperature.

14 years ago

The trachea is ___________ to the lungs Toes are _______________to the shoulders Esophagus is _____________ to trachea Pinna is ______________ to tail Liver is ______________ to stomach Options are Anterior, Posterior, dorsal, ventral, lateral, median, su...

14 years ago

S2O82-(aq) + 2I-(aq) ----------> 2SO42-(aq) + I2(aq) (I) Rate = k [S2O82-]x [I-]y Rate1 = k [S2O82-]x [I-]y ƒ´ [S2O82ƒ{] Rate = ƒ{ƒn ------------- ƒ´ƒnt Experiment data Experiment: 0.20M NaI,0.20M NaCl, 0.010M Na2S2O3,2% Starch,0.20M K2SO4, 0.20 M K2S2O8...

14 years ago

Reposting since it wasn't clear in the previous post S2O82-(aq) + 2I-(aq) ----------> 2SO42-(aq) + I2(aq) (I) Rate = k [S2O82-]x [I-]y Rate1 = k [S2O82-]x [I-]y Experiment data Experiment: 0.20M NaI,0.20M NaCl, 0.010M Na2S2O3,2% Starch,0.20M K2SO4, 0.20 M...

14 years ago

At 1473K the equilibrium constant for the reaction H2(g) + Cl2(g) <--------> 2HCl(g) Kc = 2.5*10^4. What would be the equilibrium concentration of HCL if the initial concentrations of H2 and Cl2 were 0.1840M and 0.1918M. I got 29.7 but was told it was wro...

14 years ago

I did an experiment using 20ml of 0.1M acetic acid and added 8ml of 0.1M NaOH. pH obtained after adding NaOH was 5.2. How do i calculate the mols of NaOH that reacted? mols of acetate formed, acetic acid initially present and acetic acid unreacted. Also h...

14 years ago

Metal cations can act as lewis acids in water to produce an acidic solution even though the metal ion contains no hydrogen. Water hydrates the ions in solution and partial loss of electrons from water allows hydrogen ion to be lost What is the pH of a 0.1...

14 years ago

How many moles of NaOBr- must be mixed with 0.1788 mole of HOBr and diluted to 1L to prepare a solution having a pH of 8.7043. Ka of HOBr = 2.0 * 10-9

14 years ago

Calculate the[OH-] of a solution of 0.1861M CH3CH2CH2NH3CL if Kb= 5.1*10-4 for CH3CH2CH2NH2

14 years ago

A buffer was made by mixing 0.1522 moles of HCO2H with 0.1832 moles LiHCO2- and diluting to exactly 1L. What will be the pH after addition of 10ml of 0.3657M NaOH to 50mL of the buffer. Ka(HCO2H) = 1.8*10-4

14 years ago

What is the solubility of Ca(OH)2 at a pH of 4.802 Ksp of Ca(OH)2 = 6.500*10-6

14 years ago

What is the concentration of Ni2+ in 0.0775M Ni(NO3)2 and 1.3981M NH3

14 years ago

What must be the concentration of F- to just start precipitation of SrF2 from a solution which is 1.202*10-5M i Sr(NO3)2? Ksp = 2.900*10-9

14 years ago

What would Qc be if the volume of the container increased by a factor of 1.604 for this reaction SO2+Cl2<---> SO2CL2 kc = 12.821 at 373K

14 years ago

How many grams of glycerin C3H8O3 must be dissolved in 375.9g of water at 100 degrees Celsius to reduce the pressure of water above the solution to 714.6mmHg. The solution is a non-volatile compound

14 years ago

What is the mole fraction of methanol CH3OH, in the vapor phase from a solution consisting of a mixture of methanol and propanol CH3CH2CH2OH at 40celsius, if the total pressure above the solution is 131 torr? The vapor pressures of methanol and propanolar...

14 years ago

What is the vapor pressure in Torr above a solution prepared by mixing 66.73g of benzene C6H6 with 63.26g toluene C6H5CH3 at 20 Celsius. The vapor pressure of pure benzene and toluene at 20celsius are 75 and 22 torr respectively. These compounds form near...

14 years ago

What is the mole fraction of benzene C6H6 in the VAPOR PHASE from a solution consisting of a mixture of benzene and n-hexame ch3(ch2)4ch3 at 27celsius, if the total pressure above the solution is 135.2 torr? The vapor pressures of benzene and n-hexame at...

14 years ago

The vapor pressure of pure water at 90celsius is normally 525.8 but decreased 483mmHg upon addition of an unknown amount of KNO3 to 286.9g H2O at this temperature. how many grams KNO3 were added. ASSUME COMPLETE DISSOCIATION OF SOLUTE. Tried all solutions...

14 years ago

Suppose a compound could point in any of two directions in the solid and still have the same energy. How many molecules would there be if the total entropy of a solid sample of this compound was 8.174e-9J/K I used S= klnW and got lnW = 5.92e14. How do i g...

14 years ago

The free energy change for the dissolution of cuco3 at 25celsius is 56.246KJ/mol. What is the solubility of this compound. I used delta G/-RT = lnKsp but the answer i got was wrong.

14 years ago

I think this should be easy but im stuck. Please help: Suppose a compound could point in any of two directions in the solid and still have the same energy. How many molecules would there be if the total entropy of a solid sample of this compound was 8.174...

14 years ago

If the voltage of the cell is -0.1288V at 25Celsius when [Pb2+]=0.1403M and the pressure of H2=1atm, what is the pH Pb(s)+2H+(aq)<-> Pb2+(aq) +H2(g) E0 = 0.1260V

14 years ago

How many grams of Al would be deposited from an aqueous solution of Al3+ with a current of 1.430A after 5hrs of deposition.

14 years ago

Can the half cell electrochemistry experiment using a pH meter and aqueous solutions of Cu, Cu2+ and Ag and Ag+ be used to measure even lower concentrations, such as 10^-23 mol of Cu2+ or a single free copper ion in solution? Please explain.

14 years ago

A rock containing 238U and 206Pb was examined to determine its appropriate age. The molar ratio of 206Pb to 238U was 0.1462. Assuming no lead was originally present and that all lead formed remained in the rock. What is the age of the rock in years? The h...

14 years ago

How much time in years (assume a 365 day yr) would it take for a 1.6678g sample of 239Np to decay to a mass of 0.8671g if it has a half life of 2.030*10^5s

14 years ago

How much energy in KJ is release to form one mole of 123Sb from protons and neutrons if the atom has a mass of 122.90422 amu? Please remember to include the mass of electrons in calculations. Havent been taught this yet so a step by step walkthrough would...

14 years ago

So, I'm doing a research project for my chemistry class, and one of the parts that I have to answer is the chemical reaction of the substance that I'm researching. But there's a problem. I've searched every single website regarding minoxidil, but I cannot...

13 years ago

A number multiplied by itself and then by itself again gives -1,000. What is the number? Please show the solution step by step

12 years ago

In a group of quarters and nickels, there are four more nickels than quarters. How many nickels and quarters are the if the coins are worth $2.30? Plsmshow the solution, thanks

12 years ago

A certain bacteria doubles the number of its cells every 20 minutes. A scientist puts 50 Cells in a culture disk. How many cells will be in the culture disk in 2 hours?

12 years ago

The perimeter of triangle RXA is 39, PX=49 and AP=9.Find RX and RA. P is at the middle. I think it's under triangle bisector theorem. Help me answer this guys. Thanks

10 years ago

4% on 185000 is what?

10 years ago

A computer is reduced by 15% in a sale. The original price is £560. Calculate the sale price

9 years ago

You have $30 to spend on picking 25 pounds of two different types of fruit at a farm. The apples cost $1.40 per pound the blueberries cost $.90 per pound and the cherries cost $1.10 per pound. You want prices many pounds of apples as the other two fruits...

9 years ago

The+sum+of+two+numbers+is+30+six+less+than+twice+the+smaller+number+is+equal+to+the+number+x+find+the+larger+number Please give me the answer

9 years ago

A fact was constricted, appropriate, congruent. Speech was coherent, normal rate, rhythm, and volume. Thought process was goal directed. No looseness of associations or flight of ideas. Thought content showed he denied auditory or visual hallucinations. D...

8 years ago

a vendor sold 100 fresh chicken eggs. eight of them were sold at a profit of 30% while the rest were sold at a loss of 40%. what is the percentage gain or loss on the whole stock?

8 years ago

An oblique triangle is inscribed in a circle. If one side of the triangle having a length of 10 cm and the angle subtended to that side is 20. Determine the area of the circle.

8 years ago

which of the following is an example of an art movement?

5 years ago

Could I get some help on this question: Calculate the number of grams of CuSO4*5H20 is required to make 50.0 mL of 0.100 mol/L. I'm unsure if I'm preforming conversions correctly. Thank you!

5 years ago

An Airplane lives a point on latitude 54°S at 10am. It flies due south at a steady speed 800km (a) what is its latitude at midday (12) (b) At what time does it pass over a South pole

4 years ago

I am mad today.brainly is dumb.I try and try to make an account but I cant :(😔😔😔😿😿😿😿😿

4 years ago

Simplify 3÷m–2 – m+3n÷(m–n)²

4 years ago

A school club will be competing at a state competition and has been working to raise money for the club's traveling expenses. The scatter plot below shows the amount of money raised each month over a nine-month period beginning in January.

3 years ago

Find the real values x and y given that 12+3i/x-iy=-1-i

3 years ago

Calculate the area of a circular of a radius 14cm

3 years ago

Write a letter to your uncle telling about the defuate in payment of your school fess

2 years ago

Rewrite the sentence or phrase using the indicated form of the italic adverb

1 year ago

Rewrite the sentence ot phrase using the indicated form of the italicized adverb Approach slowly Get well Far from my mind Finely carved Come quickly Favorably received Ran fast

1 year ago

ignore f's in the question

14 years ago

5.0*10^8= 0.0775/0.9331^6x x= 2.35e-10

14 years ago

2.9*10-9/1.202*10-5 and find the square root of the number = 0.0155

14 years ago

2.9*10-9/1.202*10-5 and find the square root of the number = 0.0155

14 years ago

12.821*1.604

14 years ago

Thank you DrBob222.

14 years ago

I figured it out. Had to find the molar solubility so square root of Ksp. Thanks

14 years ago

W = 2ⁿ , where n = number of molecules lnW = n • ln2 = 5.921 × 10¹⁴ ⇒ n = 8.542 × 10¹⁴ molecules

14 years ago

Thank you DrBob222

14 years ago

Can anyone help me with this question? Thanks

14 years ago

I tried this but was told the answer was wrong.

14 years ago

Thank you so much DrBob222. You are the best

14 years ago

Thank you so much DrBob222

14 years ago

Thank you so much DrBob222

14 years ago

No because 23 divide equal 69

12 years ago

No we can' t divide 23 and 4

12 years ago

33/×=6/4 cross multiply 33×4=132 6××=6× 132÷6=22 22=×

10 years ago

The denominator of a fraction exceedsby 3. If the numerator is decreased by 1 and the denominator is increased by 3, the value of the resulting fraction is 1/2. What is the denominator and numerator? Please give me the answer in detail form thanks

9 years ago

Thx.

5 years ago

Anonymous is correct!

5 years ago

The village for number 4 is the indirect object and the grain is the direct object. You gave village a direct object ending AM.

4 years ago

Isnt nice

4 years ago

How did you get -8

3 years ago

Pogi pang ambag

3 years ago

I want you to tell me the answer to my quetion

3 years ago