Calculate the mass of limestone (CaCO3) that must be decomposed to produce 73.5 g of lime (CaO).
CaCO3(s) → CaO(s) + CO2(g)

Question

Calculate the mass of limestone (CaCO3) that must be decomposed to produce 73.5 g of lime (CaO).
  CaCO3(s)  →  CaO(s)  +  CO2(g)

korosh23 · Answer

Well you have the mass of CaO. Find the molar mass of CaO using the periodic table.Then change mass of CaO to moles of CaO. Next, use mole ratio to change the moles of CaO to moles of CaCO3. Then after finding the moles of CaCO3 use the molar mass of of CaCO3, again by using the periodic table. Then you have the mass of CaCO3 :) IF you need more help, feel free to let me know.

korosh23 · Answer

Do not forget, after you change the moles of CaO to CaCO3. Change the moles of CaCO3 to mass of CaCO3 by using the molar mass of CaCO3 by looking it up in the periodic table.

korosh23 · Answer

Ex: Molar mass of H2O is 2g+16g= 18g is the molar mass of H2O