Question

how many grams of calcium oxide would be obtained by strongly heating 115g of calcium carbonate

Answer 1

CaCO3 --> CaO + CO2
Mr of CaCO3 = 100 => number of moles of CaCO3 heated = 115/100 = 1.15mol
From the equation above, mass of CaO = 64.4g

Answer 2

wtf

Answer 3

It is stoichiometry,

You have grams so convert to moles.

The chemical equation can only be applied through units of moles,


For every one Mole of Caco3 you get one mole of CaO. [Look at the coefficients in the chemical equation]

Now convert your moles of CaO into grams using the molecular weight ( add the values found on the periodic table)