Chemistry I

Chemistry I. Part B (Comprehensive Questions: 20 points)


36.A 1.345 g sample of a compound of barium and oxygen was dissolved in hydrochloric acid to give a solution of barium ion, which was then precipitated with an excess of potassium chromate to give 2.012 g of barium chromate, BaCrO4.  What is the formula of the compound?(4 points)


































37a. Phenol, commonly known as carbolic acid, was used by Joseph Lister as an antiseptic for surgery in 1865.  Its principle use today is the manufacture of phenolic resins and plastics.  Combustion of 5.23 mg of phenol yields 14.67 mg CO2 and 3.01 mg H2O.  Phenol contains only C, H, and O.  What is the percentage of each element in this substance?(2 points)






















37.b.How many milliliters of 0.250 M KMnO4 are needed to react with 4.40 g of iron(II) sulfate, FeSO4? (Hint: Volumetric analysis)

The reaction is as follows:


10FeSO4(aq) + 2KMnO4(aq) + 8H2SO4(aq)

5Fe2(SO4)3(aq) + 2MnSO4(aq) + K2SO4(aq) + 8H2O(l)

(2 points)














38.Two compounds have the same composition: 85.62% C and 14.38% H.


. a. Obtain the empirical formula corresponding to this composition.




















b. One of the compounds has a molecular mass of 28.03 amu; the other, of 56.06 amu.  Obtain the molecular formulas of both compounds.( 4 points)





















39.a.For the given aqueous reaction, write the molecular and net ionic equations, including phase labels..(2 points)


The neutralization of acetic acid by calcium hydroxide, both in aqueous solution

















39.b.Balance the following oxidation-reduction reaction by the half-reaction method…(2 points)


FeI3(aq) + Mg(s)       Fe(s) + MgI2(aq)




















40.a.One step in the isolation of pure rhodium metal (Rh) is the precipitation of rhodium(III) hydroxide from a solution containing rhodium(III) sulfate according to the following balanced chemical equation:

Rh2(SO4)3(aq) + 6NaOH(aq)     2Rh(OH)3(s) + 3Na2SO4(aq)

What is the theoretical yield of rhodium(III) hydroxide from the reaction of 0.590 g of rhodium(III) sulfate with 0.366 g of sodium hydroxide?  Show detailed work.

(3 points)




























40.b.   Using questions 40a, calculate the percentage yield ofrhodium(III) hydroxide, Rh(OH)3 ; given that the actual yield ofRh(OH)3 is 0.320 g.


Chemistry I

Looking for a Similar Assignment? Our Experts can help. Use the coupon code SAVE30 to get your first order at 30% off!


15% off for this assignment.

Our Prices Start at $11.99. As Our First Client, Use Coupon Code GET15 to claim 15% Discount This Month!!

Why US?

100% Confidentiality

Information about customers is confidential and never disclosed to third parties.

Timely Delivery

No missed deadlines – 97% of assignments are completed in time.

Original Writing

We complete all papers from scratch. You can get a plagiarism report.

Money Back

If you are convinced that our writer has not followed your requirements, feel free to ask for a refund.

WhatsApp us for help!