Chemistry

can you please please help me with these questions I don't know how to do any of them. I know how to calculate moles and grams and mole ratio,etc but I don't understand the limiting excess reactant and yield stuff. Thanks!


1.In the following chemical reaction, how many grams of the excess reactant are left over when 0.45 moles of Al react with 1.25 moles of Cl2 ?
2Al + 3Cl2 → 2AlCl3


2.Using the following equation, determine the % yield from the following reaction if 30.65 g of octane (C8H18 ) react with excess oxygen to produce 81.75 g of CO2

C8 H18 (I) + 25 O2 (g) → 16CO2 + 18H2O

moles of kcl=10.35/74.55=0.138


3.
For the following reaction, determine the amount of AgCl(s) formed when 10.35 g of KCl(aq) react with excess AgNO3 (aq) to produce AgCl(s) and KNO3 (aq) with a 77.15% yield.

AgNO3 + KCl → AgCl(s) + KNO3

asked by molly
  1. See your post above.

    posted by DrBob222

Respond to this Question

First Name

Your Response

Similar Questions

  1. science 2 quick questions

    1. Describe 2 methods of viral infection 2. How can a virus be helpful to its host? I don't want sites because they don't help, please help me and explain . All my other questions r done but I'm stuck on these 2.
  2. general

    I really don't like the fact that you guys are skipping so many questions we need help here and were not getting it. i understand that no one knows everything but, please don't skip the questions its really hard when i need help
  3. english

    for the article "DON'T LEAVE ME HERE TO DIE" i need to ask tought questions as a interviewer, what kind of tough questions could i ask? one of my question is: Did you have guilt over not saving Fran? can I please have questions.
  4. urgent!!!words questions

    I have alot of questions here but you don't have to answer them all but please help me!They are due on 24/6/05. The male of mare? The citizens of Paris,Netherlands,New Zealand or Malta? The collection name for
  5. Law & Ethics

    I am working on a research paper for a course I am taking through Penn Foster. I have to answer several questions but I don't know if I am supposed to write the questions on the report, or just answer them ..you know..using the
  6. math-moneyfractions

    i have some math questions that i really ,really,need help with asap if any body can explain some of these questions that will be great help.Ok here are 3 of the questions i am about to type now ok the first one says,whole 16
  7. PHYSICS-Help required

    My physics questions are not on graphs, this is just a practise quiz I'm doing. All the questions I've done so far were not guessed answers, I did my work on a separate piece of paper, all I really had to do was divide. The other
  8. English

    I just had an English exam, and I don't think I do too well. Anyways, there was a few questions in it that I didn't quite understand in the prose questions (comprehensions or whatever they're called). After reading the passage,
  9. NVQ level 3 buisness admin

    ok im really struggling on the questions on unit 314 hy the hell is there no question marks i have to anwser them like questions,its confusing me?? please can anyone shed a light over my way please.x cheers ema We don't have
  10. English

    1. This time only the members of Group One can answer the questions. 2. This time only the memvers in Group One can answer the questions. (Which preposition should I use? Can we use both prepositions? Which one is commonly used?)
  11. Social Studies

    1. At what point during the Revolution and Napoleonic period (between 1789 and 1815) do you think France became a nation? 2. What was the main event of the Revolution or Napoleonic period that you think made the people of France

More Similar Questions