Homework Help: Chemistry

Posted by Bob on Monday, February 23, 2009 at 9:39am.

What is the theoretical yield of calcium carbonate if 2.97 grams of calcium chloride dihydrate reacts with excess sodium carbonate according to the balanced chemical reaction shown below?
CaCl2•2H20(aq)+Na2CO3(aq)->CaCO3(aq)+2NaCL(aq)+2H20(I)

Please use molar mass values calculated and rounded to the hundredths place, and round your answer to the hundredths place.

to find the molar mass, i did:
Ca = 40.08
Cl2 = (35.45) x 2 = 70.9
2H2O = (18.02) x 2 = 36.04

40.08 + 70.90 + 36.04 = 147.02 g/mol

To find the theoretical yield, i did:
2.97g CaCl•2H2O x (1 mol CaCl•2H2O/147.02g CaCl•2H2O) x (1 mol CaCO3/1 mol CaCl•2H2O) x (100.09/1 mol CaCO3) = 2.04 g

Did I do the theoretical yield equation correctly?

Chemistry - DrBob222, Monday, February 23, 2009 at 10:59am
Yes, your procedure is correct. I obtained 147.014 for CaCl2.2H2O and 100.087 for CaCO3 but I'm using a calculator on the internet and that may not agree with the numbers on your periodic table. They should agree if both contain the most up to date information. Using my numbr I obtained 2.0219 g for the theoretical yield, which rounds to 2.02. Here is the site I use for molar mass calculations if you wish to compare their numbers versus your numbers. http://environmentalchemistry.com/yogi/reference/molar.html

Answer this Question

Related Questions

Chem - Question: "Calculate the theoretical yield of calcium carbonate of ...
Chemistry - Hi, I have a few questions that I am struggling with. Any help would...
chemistry - which reactant in the reaction of sodium carbonate and calcium ...
Chemistry - A solution of 100.00mL of 0.2000mol/L sodium carbonate and 200.00mL ...
chemistry - Write the correct equation for the formation of a white precipitate ...
chemistry - For a lab in school we had to mix together sodium carbonate and ...
Chemistry - calcium carbonate decomposes if heated to form calcium oxide and ...
Chemistry - When calcium carbonate is added to hydrochloric acid, calcium ...
chemistry - the recommended daily allowance of calcium is 1.2 g. calcium ...
Chemistry - Please help, I have been trying to figure this out for some time: ...

For Further Reading

First Name:
School Subject:
Answer: