Chemistry lab homework help


Question Description

i need it in 4 hours pls. the info in a file below

Unformatted Attachment Preview

Post Lab Assignment – Synthesis and Limiting Reactant CHEM 131L Spring 2016 Include the following information at the top of the first page of your assignment: Name: Lab Partner Name: Lab Section Number: Experiment Title: Due Date: GENERAL INSTRUCTIONS The entire report should be typed (handwritten portions will NOT be graded). Please organize your report as shown below. You and your lab partner may not turn in the same work. DATA & CALCULATIONS Useful Information: The 25.0 wt % ethylenediamine solution contains 25.0 % ethylenediamine by mass, dissolved in water, and has a density of 0.950 g/mL. First calculate the mass of the C2H8N2 solution from its volume and density, then calculate the mass of the C2H8N2 by remembering that wt % solution = mass of solute x 100 mass of solution From their masses and formula weights, you should then compute the number of moles of NiCl2•6H2O and of C2H8N2 that were used. (Remember the formula weight of NiCl2•6H2O should include the mass of the waters of hydration.) 1. Create a typed table that concisely presents the quantities (mass or volume as appropriate for each reagent, as well as moles for all reagents) and appearance of both of the reactants and the nickel product. (Remember to clearly label the table with a title and headers for all data columns/ rows. Avoid blank cells in the table.) 2. What was the limiting reactant for your synthesis? Show your typed calculations. 3. What was the theoretical and percent yield of trisethylenediaminenickel(II) chloride for your experiment? Show your typed calculations. 4. Assuming all of the limiting reactant was completely consumed (reacted), how many moles of the other reactant (non-limiting) remained? Show your typed calculations. QUESTIONS – All answers should be typed and answered in complete sentences. 1. What was the purpose of cooling the reaction mixture in an ice-water bath? Support your answer with what you observed during this step of the synthesis. 2. Suggest at least one reason why a percent yield of less 100% would be obtained. Use an actual observation from this experiment to support your answer. 3. During the purification of compound step, what would you expect to happen to the percent yield of the product if a student washed the product with water rather than acetone? Explain your answer. 4. During the purification of compound step, what would you expect to happen to the percent yield of the product if a student only dried the product for 1 minute? Explain your answer. ADDITIONAL PROBLEM 1. Consider the reaction: MnO2 (s) + 4 HCl (g)  MnCl2 (s) + Cl2 (g) + 2 H2O (g) If 10.00 g of MnO2 and 10.00 g of HCl are reacted, how many grams of MnCl2 can be produced? Show all calculations. ...
Purchase answer to see full attachment

Tutor Answer

School: UIUC

flag Report DMCA

The tutor was pretty knowledgeable, efficient and polite. Great service!

Heard about Studypool for a while and finally tried it. Glad I did caus this was really helpful.

Just what I needed… fantastic!


Brown University

1271 Tutors

California Institute of Technology

2131 Tutors

Carnegie Mellon University

982 Tutors

Columbia University

1256 Tutors

Dartmouth University

2113 Tutors

Emory University

2279 Tutors

Harvard University

599 Tutors

Massachusetts Institute of Technology

2319 Tutors

New York University

1645 Tutors

Notre Dam University

1911 Tutors

Oklahoma University

2122 Tutors

Pennsylvania State University

932 Tutors

Princeton University

1211 Tutors

Stanford University

983 Tutors

University of California

1282 Tutors

Oxford University

123 Tutors

Yale University

2325 Tutors