Homework Help: Chemistry

Posted by George on Sunday, September 21, 2008 at 1:47am.

When heated, calcium carbonate decomposes to yield calcium oxide and carbon dioxide gas. How many grams of calcium carbonate are needed to produce 81.0 of carbon dioxide at STP?

Is the asnwer 80.95

Chemistry - drwls, Sunday, September 21, 2008 at 8:29am
The reaction is

CaCO3 -> CaO + CO2

What are the units of your 81.0? Liters? Whatever it is, convert it to moles at STP.
81.0 l is 3.61 moles at STP. You will need the same number of moles of CaCO3.

1 mole of CaCO3 has a mass of 40 + 12 + 48 = 100 g

80.95 g is not the answer.

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