Thursday
October 2, 2014

Homework Help: chem

Posted by laura on Sunday, April 15, 2007 at 2:18pm.

a test tube containing CaCo3 is heated until all the compound decomposes. If the test tube plus calcium carbonate originally weighed 30.08 grams and the loss of mass during the experiment is 4.40 grams, what was the mass of the empty test tube?


Write the equation.
CaCO3 ==> CaO + CO2

First, the equation isn't quite clear. The questions gives the impression that CaCO3 COMPLETELY decomposes; in reality, it decomposes into CO2 (which is the loss in mass) but it leaves CaO.
Convert 4.40 g CO2 to mols CO2. Convert that to mols CaCO3. Convert that to grams CaCO3.
Then grams CaCO3 + test tube = 30.08 g
less grams CaCO3 = ??
The difference is the mass of the test tube.

Answer this Question

First Name:
School Subject:
Answer:

Related Questions

Chem - A gas generator is constructed to collect the CO2(g) evolved from a ...
Chemistry - Some solid calcium oxide in a test tube picks up water vapor from ...
chemistry (science) - When heated, calcium carbonate decomposes to yield calcium...
Chemistry-Please help - When heated, calcium carbonate decomposes to yield ...
chem - In the lab, you're handed a test tube with sodium chloride dissolved in ...
Chemistry - calcium carbonate decomposes if heated to form calcium oxide and ...
chemistry - Assume you are in a lab with a test tube of sulfuric acid. You drop ...
Chemistry 1201 - When heated, calcium carbonate decomposes to yield calcium ...
chemistry - formula: 2KClO3 + NaCL = 2KCl + NaCl + 3O2 MASS OF TEST TUBE & ...
Chemistry - You have 20mL of a solution of concentration 0.015mg/mL of x in test...

Search
Members