When surface water dissolves carbon dioxide, carbonic acid (H2CO3) is formed. When the water moves underground through limestone formations, the limestone dissolves and caves are sometimes produced.

Question

CaCO3(s) + H2CO3(aq) Ca(HCO3)2(aq)

What mass of limestone must have dissolved if 1.98 1010 kg of calcium hydrogen carbonate was produced?

Answer 1

!. Write and balance the equation. I note there is no arrow in your equation.
2. Convert grams calcium hydrogen carbonate to moles. moles. = grams/molar mass.
3. Using the coefficients in the balanced equation, convert moles in step 2 to moles of limestone.
4. Convert mols limestone to grams. grams = moles x molar mass.
Post your work if you get stuck.