Sorry, CaCO3 is actually the reactant, that is heated, while CO2 and CaO are the products.

The book I am using does not show how to solve a problem such as this, but I think I got this.

Is this right, it's very close to the answer you guys are getting...

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It's a bit messy, but keep in mind that I just woke up, and I'm not really a morning person.

Okay, as you can see that I'm a bit off with the rounding off of the digits; if I round off the CaCO4 kg to three digits (because of the 125g value) then I get a result of 66679. Is that the right method?