[stumpedstudent]

Hi,

There are several questions I'm stumped over and I would appreciate any help, advice, or hints as to how to solve these problems.
Thank you.
*numbers are subscripts

1) What Mass of calcium carbonate (CaCO3) would be formed if 248.6 g of carbon dioxide (CO2) were exhaled into limewater, Ca(OH)2? How many grams of calcium would be needed to form that amount of calcium carbonate? Assume 100% yield in each reaction.

* I am having trouble with this one because I don't know how to set it up. I know you have to set it up in a chemical formula but I'm not sure whether it's right and what would I need to do from there?

2) The following reaction is used to form lead iodide crystals. What mass of crystal (PbI2) could be formed from 1.0 x 10^3 of lead (II) acetate [Pb(2H3O2)2]?

* I'm not sure how to set this one up either, I tried the 5 step method given to find reactants and product but my answer was wrong.

[opti384]

1) First show what you did to set up the equation. Then you would need to think of 248.6 g of CO_2 in chemical amounts.

2) Start from finding how many mols of Pb are in lead (II) acetate.