# Stoichiometry problem

posted by Rachel

I'm stuck and am hoping you can help. Here is the problem:

You react 7.92 grams of silver nitrate, AgNO3(aq), with an excess of sodium chloride, NaCl(aq). How many grams of silver chloride, AgCl(s), will precipitate from the solution?

Any help would be appreciated.

Most of these stoichiometry problems are worked alike.
Step 1. Write a balanced chemical equation.
AgNO3 + NaCl ==> AgCl + NaNO3.

Step 2. Convert what you have (in this case 7.92 grams AgNO3) to mols remembering that mols = grams/molar mass. The molar mass is approximately 170. You will need to look up the exact value and use it.

mols AgNO3 = 7.92/170 = 0.0466

Step 3. Convert mols of what you have (in this case mols AgNO3) to mols of what you want (in this case AgCl) using the coefficients in the equation from step 1.

0.0466 mol AgNO3 x (1 mol AgCl/1 mol AgNO3) = 0.0466 mol NaCl. Note how the mol AgNO3 in the numerator cancels with the mols in the denominator to leave mols of what you want; i.e., mols AgCl.

Step 4. Now convert mols of what you have into grams using the reverse of step 2; i.e., mols = grams/molar mass, then grams = mols x molar mass.
grams AgCl = mols AgCl x molar mass AgCl.
g AgCl = 0.0466 x 143 (approx) = 6.66 grams.

That's all there is to it. You will need to look up, or calculate, the molar mass of AgNO3 and AgCl. I just rounded those values for convenience. Then you will need to go through the calculations yourself but you should get an answer close to 6.66 g AgaCl.

I hope this helps.

DrBob222 you are amazing!!!!! Seriously I think you just helped me more than you will ever know!

Aint chemistry fun?

When you come to
a. limiting reagent problems
b. problems using volume instead of grams or asking for volume of a product formed instead of grams,

THEN we simply make an adjustment or two to the original four-step process so no extra "learning" is required. This process will stand you in good shape for weight/weight; weight/volume; volume/weight; volume/volume; and limiting reagent problems. My guess is that this four-step process will work about 95% (or more) stoichiometry problems.

how many grams of NH3 are needed when 2.96 g of Cr(NO3)3 react according to the reaction: Cr(NO3)3 + NH3 ---> Cr(NH3)6(NO3)3?

hey como hago para contestar las preguntas d emi homework?

What mass of hydrogen peroxide must decompose to produce 48.64gof water?

1. Christina

I can't figure out what to do after this problem : what mass of SO2 is produced from the reaction between 31.5 g of S8 and 8.65g of O2? I have figured out the balanced equation but do I pick one of the givens and solve it straight out?

2. Anonymous

No, you have to figure out which one you will run out of first. Your "limiting reactant"

3. ali

NacI and AgNo3

4. Anonymous

Nitroglycerin decomposes explosively to produce carbon dioxide, water, nitrogen, and oxygen. What volumes of nitrogen and oxygen are produced if 4.3 L of carbon dioxide is produced? The balanced equation is
4C3H5(NO3)3 „± 12CO2 + 10H20 + 02 + 6N2

5. nicole

how many moles of aluminum chromate Al2 (CrO4)3 in a sample of aluminum chromate that contains 6.20 x 10^14 atoms of chromium?

6. jared

barium chloride+dihydrate with silver nitrate

7. Alicat

I don't know how to do stoich and I'm in grade 11!! Help Me!!!!!

8. Nick

Confused and Jason, same person? Chemistry itself is definitely not pointless. Imagine where you'd be without the miracles that chemistry presents us in everyday life: Plastics, Medicine, Cars, Reliable Machines, Colors in Clothing and Other Products, Flavored Drinks, Batteries, Electronics. I am glad the people who brought us these products didn't decide to ignore chemistry.

9. Malogis

supercalifragilisticexpialidocious

10. Malogis

when is anybody ever really going to need to know is in real life? I am a senior I do not plan on ever going into science or anything that would ever require me to know this stuff,...so my question is then why is it a required class for me to take to graduate when i will never agin use it and its rather insignificant in my eyes........why spent countless days turing pages and learning something i will NEVER for a fact use again in my entire life....if you ask me this is just a useless form of legal torture created by adults who hate kids for some unknown reason.......ANYONE ELSE AGREE??

11. Rob

@Malogis

I agree 100% :P

12. stella

vhlhil.jk

13. Kristen

I'm stuck and am hoping you can help. Here is the problem:

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How many grams of phosphorus can be obtained from the decomposition of 45 kg of POCL3.

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15. Anonymous

What mass of SO2 is produced from the reaction between 31.5g of S8 and 8.65g of O2?

16. Holly

How do you find the molarity(M) of NaOH in this reaction:

2NaOH(aq) + H2C2O4-H2O > Na2C2O4(aq) + 2H2O

The only given information is 0.2079g of H2C2O4-2H2O

17. Anon

I know I wont be ever needing chemistry in my future career!...

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