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Topic: A mixture of CaCO3 and CaO weighing 0.636 g was heated to produce CO2.  (Read 10078 times)

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Offline jctruong

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A mixture of CaCO3 and CaO weighing 0.636 g was heated to produce CO2.
« on: January 27, 2008, 07:29:33 PM »
After heating, only CaO solid remains and it weighs 0.504 g.

Assuming all the CaCO3 decomposed to CaO and CO2, calculate the mass percent of CaCO3 in the original mixture.
 


Hi guys I just finished a test and was unable to answer this question. if anyone can walk me through it that would be much appreciated. thank you very much.

answer is 47.2
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Offline Bakegaku

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Re: A mixture of CaCO3 and CaO weighing 0.636 g was heated to produce CO2.
« Reply #1 on: January 27, 2008, 07:41:06 PM »
Write a balanced equation for the reaction and find the masses of all chemicals involved.
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Offline jctruong

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Re: A mixture of CaCO3 and CaO weighing 0.636 g was heated to produce CO2.
« Reply #2 on: January 27, 2008, 08:05:59 PM »
sorry i still don't really understand it. i tried to write the balanced equation of caco3 and cao heated to 2cao and co2. but when i tried to do the stoich i still don't have it. maybe i'm just doing it all wrong?
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Offline Yggdrasil

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Re: A mixture of CaCO3 and CaO weighing 0.636 g was heated to produce CO2.
« Reply #3 on: January 27, 2008, 11:52:37 PM »
CaCO3 --> CaO + CO2

Based on the information given, can you find the mass of carbon dioxide that was produced.  How does the amount of carbon dioxide produced relate to the original amount of CaCO3?
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Offline AWK

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Re: A mixture of CaCO3 and CaO weighing 0.636 g was heated to produce CO2.
« Reply #4 on: January 28, 2008, 01:04:33 AM »
Quote from: jctruong on January 27, 2008, 08:05:59 PM
sorry i still don't really understand it. i tried to write the balanced equation of caco3 and cao heated to 2cao and co2. but when i tried to do the stoich i still don't have it. maybe i'm just doing it all wrong?
Do not join different reagents in one reaction.
Mass of CO2 is eqivalent to mass of CaCO3 decomposed.
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