Homework Help: chemistry

Posted by kyled on Tuesday, February 12, 2008 at 2:13pm.

The balanced reaction is
CaCO3 + 2 NaF -> CaF2 + Na2CO3
If you start with 20.0 grams CaCO3, how many moles of CaCO3 do you have?

20.0
2.00
.200
.0200
.0386

If you start with .500 moles of NaF, how many moles of CaF2 will form
.500
1.00
1.50
2.00
0.250

What is the sum of the coefficients (including “1”) of the following reaction?
Sodium sulfate + calcium hydroxide ???

4
5
6
7
9

Predict the precipitate that forms: HCl + AgNO 3 ???
HNO3
HCl
AgNO3
AgCl
no precipitate forms

chemistry - DrBob222, Tuesday, February 12, 2008 at 2:23pm
DrWLS answered this for you below, for the first one. We want to see some work for the others. If you can't get started, repost one question at a time, and tell us exactly what you don't understand.
- Compounds and Mixtures - Hazzer, Tuesday, February 12, 2008 at 3:08pm
  A mixture is easier to seperate than a compound because a compound is chemically bounded.
  - Compounds and Mixtures - DrBob222, Tuesday, February 12, 2008 at 4:17pm
    If you have a question, please go to the top of the page, click on post a new question, and type in your question. Someone will be happy to help.
- chemistry - DrBob222, Tuesday, February 12, 2008 at 5:36pm
  I answered #2 and #3 at the original post.

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