How many moles of caco3 are there in an antacid tablet containing 0.499 g caco3?

There are 0.004 moles in .499 grams of CaCO3

Explanation:

Rememeber that to calculate the moles of a substance and its molar mass, in this example you are usin CaCO3 or calcium carbonate, which has a molar mass of 100.0869 g/mol that is a mol, so you just do a simple rule of three, where 100.0869 is 1 how much does .499 grams represent?:

So there are 0.004 moles in .499 grams of CaCO3

the answer is c.the valence of the atoms combine .