HomeworkLib
Question

The composition of a hydrated tetramethylammonium-salt of a chromium(III)-oxalate complex ion conforms to the general formula:...

The composition of a hydrated tetramethylammonium-salt of a chromium(III)-oxalate complex ion conforms to the general formula:

(N(CH3)4)xCr(C2O4)3·wH2O

A 0.4986-g sample of this compound required 36.96 mL of 0.02909 M KMnO4 solution for the titration of all of the oxalate.

Molar mass = 5.565×102 g/mol

X = 3

What is w?

science   chemistry   
0 0
Add a comment Improve this question Transcribed image text
Next > < Previous
Sort answers by oldest

Homework Answers

Answer #1

Ans:

When ‘X=3’ the formula takes the form (N(CH3)4)3Cr(C2O4)3·wH2O

Molar mass of the complex ion, M = 5.565×102 g/mol = 556.5 g/mol

Molar mass of H2O = 18 g/mol

Molar mass of the complex ion = Molar mass of the (N(CH3)4)3Cr(C2O4)3 + (w x 18)

Molar mass of the (N(CH3)4)3Cr(C2O4)3 = 538.49 g/mol (calculate from periodic table)

Molar mass of the complex ion = Molar mass of the (N(CH3)4)3Cr(C2O4)3 + (w x 18)

556.5 = 538.49 + (w x 18)

w = 1.00055556 ~ 1

So, w = 1

0 0
Add a comment
Know the answer?
Add Answer to:
The composition of a hydrated tetramethylammonium-salt of a chromium(III)-oxalate complex ion conforms to the general formula:...
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Log In

Sign Up

Not the answer you're looking for? Ask your own homework help question. Our experts will answer your question WITHIN MINUTES for Free.
Similar Homework Help Questions

  • Analysis of a Transition Metal Oxalate Complex Salt Hydrate The composition of a hydrated potassium-salt of...

    Analysis of a Transition Metal Oxalate Complex Salt Hydrate The composition of a hydrated potassium-salt of a chromium(III)-oxalate complex ion conforms to the general formula: KxCr(C2O4)2·wH2O A 0.2203-g sample of this compound required 19.84 mL of 0.02765 M KMnO4 solution for the titration of all of the oxalate. Calculate the number of moles (mol) of oxalate in this sample. 1homework pts Tries 0/5 Calculate the number of moles of oxalate per gram (mol/g) of the compound. 1homework pts Tries 0/5...

  • 1. Calculations Given the following data, determine the % by mass of oxalate (C2O42-) in a...

    1. Calculations Given the following data, determine the % by mass of oxalate (C2O42-) in a sample of an iron oxalate complex with the general formula Kz[Fex(C2O4)y].wH2O. The reaction between oxalate and permanganate is as follows: 6H+ + 5(COOH)2 + 2MnO4- → 10CO2 + 2Mn2+ + 8H2O m(iron oxalate complex) used for titration = 0.100 g C(KMnO4) standard solution = 0.0200 M M(C2O42-) = 88.02 g mol-1 Titre volume = 10.18 mL Enter your answer to 3 significant figures. 2....

  • Given the following data, determine the % by mass of oxalate (C2O42-) in a sample of...

    Given the following data, determine the % by mass of oxalate (C2O42-) in a sample of an iron oxalate complex with the general formula Kz[Fex(C2O4)y].wH2O. The reaction between oxalate and permanganate is as follows : 6H+ + 5(COOH)2 + 2MnO4- → 10CO2 + 2Mn2+ + 8H2O m(iron oxalate complex) used for titration = 0.100 g C(KMnO4) standard solution = 0.0200 M M(C2O42-) = 88.02 g mol-1 Titre volume = 11.91 mL Enter your answer to 3 significant figures. Do not...

  • BACKGROUND: Synthesis of Potassium Iron (III) Oxalate Hydrate Salt The iron(II) ions from Fe(NH4)2(SO4)2•6H2O will be precipitated as iron(II) oxalate. Fe^2+(aq) + C2O4^2-(aq) --> FeC2O4 (s) The su...

    BACKGROUND: Synthesis of Potassium Iron (III) Oxalate Hydrate Salt The iron(II) ions from Fe(NH4)2(SO4)2•6H2O will be precipitated as iron(II) oxalate. Fe^2+(aq) + C2O4^2-(aq) --> FeC2O4 (s) The supernatant liquid, containing the ammonium and sulfate ions, as well as excess oxalate ions and oxalic acid will be decanted and discarded. The solid will then be re-dissolved and the iron(II) ions will be oxidized to iron(III) ions by reaction with hydrogen peroxide. 2Fe^2+(aq) + H2O2(aq) --> 2Fe^3+(aq) +2 OH^ - (aq) The...

  • With the completion of the determinations of % potassium, % iron, and % oxalate in the...

    With the completion of the determinations of % potassium, % iron, and % oxalate in the crystals, you may calculate the % water. The percentage compositionof the crystals, KxFe(C2O4)y · zH2O, has then been completely determined experimentally. The simplest formula (x,y,z) can now be calculated from the the percentage composition. Once the formula is know it is then possible to calculate the percent yield of product that was obtained in the preparation and purification of the crystals. From Part A:...

  • From Part A: Mass of KxFe(C2O4)y · zH2O prepared : 4.200 g Mass of FeCl3 :...

    From Part A: Mass of KxFe(C2O4)y · zH2O prepared : 4.200 g Mass of FeCl3 : 1.60 g From Part B: % Potassium in compound : 22.00 % % Iron (from ion exchange & titration vs. NaOH) : 9.10 % From Part C: % Oxlate : 36.96 % - Calculate the % water of hydration : Calculate the following for Fe3+: g in 100 g sample mol in 100 g sample mol/mol Fe (3 sig figs) mol/mol Fe (whole number)...

  • Kc is 2.35 × 1018 at 25 °C for the formation of iron(III) oxalate complex ion....

    Kc is 2.35 × 1018 at 25 °C for the formation of iron(III) oxalate complex ion. If 0.0450 mol L‐1 Fe3+ is initially mixed with 2.00 mol L‐1 oxalate ion, what is the concentration of Fe3+ ion at equilibrium? a) complete the concentration summary below. Fe3+(aq) + 3C2O42‐(aq) ⇌ [Fe(C2O4)3]3‐(aq) Initial concentrations 0.0450M 2.00M 0 Change is Concentrations due to stoichiometric Reaction Initial Conc. After stoichiometric reaction Change in concentration to reach equilibrum Equilibrium Conc. The concentration of Fe3+ at...

  • With the completion of the determinations of % potassium, % iron, and % oxalate in the...

    With the completion of the determinations of % potassium, % iron, and % oxalate in the crystals, you may calculate the % water. The percentage compositionof the crystals, KxFe(C2O4)y · zH2O, has then been completely determined experimentally. The simplest formula (x,y,z) can now be calculated from the the percentage composition. Once the formula is know it is then possible to calculate the percent yield of product that was obtained in the preparation and purification of the crystals. From Part A:...

  • From Part A: Mass of KxFe(C2O4)y · zH2O prepared : 4.359 g Mass of FeCl3 : 1.60 g From Part B: % ...

    From Part A: Mass of KxFe(C2O4)y · zH2O prepared : 4.359 g Mass of FeCl3 : 1.60 g From Part B: % Potassium in compound : 22.70 % % Iron (from ion exchange & titration vs. NaOH) : 10.60 % From Part C: % Oxlate : 55.69 % Now, let's finish the calculation and the determination of the formula of the iron compound: Calculate the % water of hydration : Tries 0/3 Calculate the following for Fe3+: g in 100...

  • Help please??! Molarity of KMnO4 is 0.0100 M Determination of oxalate in Kufe.(0,0...0). Name AB A...

    Help please??! Molarity of KMnO4 is 0.0100 M Determination of oxalate in Kufe.(0,0...0). Name AB A LOCAL Partner's Name MA R ENDALL Total mass of product synthesized in previous experiment (6) 1720 g Molarity of KMnO. (Record from the label on the container) Trial 1 Trial 2 Trial 2 0.105 1. Mass of sample taken for titration (g) 0.11 2. Initial burette reading (ml) 0 Final burette reading (ml) 20 33.4 22.2 4. Volume of KMnO, used (ml) 2.2 5....

ADVERTISEMENT
Free Homework Help App
Download From Google Play
Scan Your Homework
to Get Instant Free Answers
Need Online Homework Help?
Ask a Question
Get Answers For Free
Most questions answered within 3 hours.
ADVERTISEMENT
ADVERTISEMENT