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July 22, 2014

Homework Help: AP CHEM FULL ?

Posted by Sam on Saturday, December 2, 2006 at 8:09pm.

This is part of a marathon problem, we have to identify the five compunds of H, N, and O described below. For each compound, I have to write a Lewis structure that is consistent with the information given.
a.) All the compunds are electrolytes, although not all of them are strong electrolytes. Compunds C and D are ionic and compund B is covalent.

b.) Nitrogen occurs in its highest possible oxidation state in compunds A and C; nitrogen occurs in its lowest oxidation state in compunds C,D, and E. The formal charge on both nitrogen in compund C is +1; the formal charge on the only nitrogen in compund B is 0.

c.) Compund A and E exist in solution. Both solutions give off gases. Comercially available concentrated solutions of compund A are normally 16 M. The commercial, concentrated solution of compound E is 15 M.

d) Commercial solutions of compund E are labeled witha misnomer that implies that a binary, gaseous compund of nitrogen and hydrogen reacted with watert to produce ammonium ions and hydroxide ions. Actually this reaction occurs to only a slight extent.

e) Compound D is 43.7% N and 50.0% O by mass. If compound D were a gas at STP, it would have a density of 2.86 g/L.

f) A formula unit of compund C has one more oxygen than a formula unit of compound D. Compounds C and A have one ion in common when compound A is acting as the strong electrolyte.

g) Solutions of C are weakly acidic; solutions of compound A are strongly acidic; solutions of compound B and E are basic. The titration of .726 g of compound B requires 21.98 ml of 1.000 M HCl for complete neutralization.

This is due tomm and I have no idea what the question is asking or how to start.

The question is asking you to identify the five compounds from hints.
How to start? Start with compound D. e) gives you the percentage composition and mol mass (mass per 22.4 liters).

the descriptions are so detailed that you can determine the compounds A,B,C,D,and E.

What do you know about:
A.

B.

C.

D.

E.

When I was in graduate school we called these railroad problems because we thought the purpose was to railroad us out of the class. Look for a tag on all of the information. For this problem, it is compound E. That MUST be NH3. D gives you percent composition (I assume there is 6.3% hydrogen) so you get a simplest formula and that with the density of the material gives the molecular formula. The 21.28 mL of 1.00 M HCl to titrate 0.726 g compound B gives the molar mass of compound B and the fact it is basic is a give-a-way. Repost with any questions you have.

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