Author Topic: Chem - I need help please!  (Read 1066 times)

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Offline MessedThoughts

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Chem - I need help please!
« on: April 03, 2014, 10:37:33 pm »
hey guys, can anyone tell me how to get the answer to this question (not the actual answer, but the process)? I'm cramming for a test and i cant seem to understand how this works

a 0.9157g mixture of CaBr2 and NaBr is dissolved in water and AgNO3 is added to the solution to form a AgBr precipitate. If the mass of the precipitate is 1.6930g, what is the percent by mass of NaBr in the original mixture?
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Offline Cookie-N

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Re: Chem - I need help please!
« Reply #1 on: April 03, 2014, 11:26:41 pm »
Form chemical equation, find Mr, find mol, find percentage composition using new mol and Mr.
KEK

Offline Jethro

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Re: Chem - I need help please!
« Reply #2 on: April 04, 2014, 01:28:10 am »
Isn't it just the mass of what you have left divided by the total mass?

Offline MessedThoughts

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Re: Chem - I need help please!
« Reply #3 on: April 04, 2014, 06:31:24 am »
I'm dumb, i figured this out. Thanks Guys!
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