Question

when 31 g of copper(II) carbonate is used: how many grams of carbon dioxide form? equation

Answer 1

Answer:

Hard to say, since you don't specify the reaction.

However, you could have something like

CuCO3 + ... -> Cu?? + CO2 + H2O

That would release 1 mole of CO2 for every mole of CuCO3.

Now just convert 31g CuCO3 to moles, and convert that back to grams of CO2

If that's not your reaction, then write the balanced equation and compare moles of CuCO3 and CO2