Yahoo Answers: Answers and Comments for How much CO2 is collected(in L) at STP on heating x g of Calcium Carbonete (CaCO3) ? [Chemistry]
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Sun, 16 Nov 2008 01:42:04 +0000
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Yahoo Answers: Answers and Comments for How much CO2 is collected(in L) at STP on heating x g of Calcium Carbonete (CaCO3) ? [Chemistry]
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From mRNA: STP stands for 'standard temperature and p...
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https://answers.yahoo.com/question/index?qid=20081116014204AAGqKUu
Sun, 16 Nov 2008 02:26:01 +0000
STP stands for 'standard temperature and pressure' and provides a unifying reporting system for thermochemical data. IUPAC currently defines this to be a temperature
T = 273.15 K and a pressure p = 100,000 Pa.
One thing to note is that at STP, one mole of an ideal gas occupies a volume called a standard molar volume.
Using the ideal gas equation:
pV = nRT ==> V = nRT/p
for one mole, n = 1
==> standard molar volume, V°m = (8.314)(273.15)/(100000)
V°m = 2.271 x 10ˉ² m³
= 22.71 L
Note that the OLD value of V°m was 22.4 L as the OLD standard pressure USED to be 1 atm = 101325 Pa. IUPAC no longer use 1 atm as standard pressure.
Back to your balanced equation:
CaCO3(s) > CaO(s) + CO2(g)
The balanced equation tells you that for every mole of CaCO3 that is completely decomposed, you get 1 mole of CO2 (as well as 1 mole of CaO).
The mass of one mole of CaCO3 is given by its molar mass and is 100.1 g molˉ¹. Therefore for x g of CaCO3 you will get (x/100.1) moles of CO2.
You know from above that one mole of (ideal) gas has a volume of 22.71 L at STP. Therefore for x g of CaCO3 completely decomposed you will collect (x/100.1)*(22.71) L of CO2 at STP.

From SS4: STP = standard temperature and pressure (273.1...
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https://answers.yahoo.com/question/index?qid=20081116014204AAGqKUu
Sun, 16 Nov 2008 01:48:49 +0000
STP = standard temperature and pressure (273.15K and 100KPa)
You need to know the equation
CaCO3(s) > CaO(s) + CO2(g)
So one mole of CaCO3 gives off one mole of CO2
At STP one mole of gas occupies exactly 22.4dm³ = 22.4L
100g CaCO3 = 1mol
So for every 100g of CaCO3 you will get 22.4L of CO2