Question

Please Help with the following problem :) : Calculate the percentage of CaCO3 in a sample, if all the amount of calcium comes from CaCO3, given that %oxide:0,38% CaO ?

Answer 1

The sample contains `"0,68 % CaCO"_3`

Explanation:

We can write a partial equation.

`M_text(r):color(white)(m)"56,08"color(white)(mll)"100,09"`
`color(white)(mmml)"CaO → CaCO"_3`

Assume the sample has a mass of 100 g.

Then the mass of CaO is 0,38 g.

`"Mass of CaCO"_3 = "0,38" color(red)(cancel(color(black)("g CaO"))) × ("100,09 g CaCO"_3) /("56,08" color(red)(cancel(color(black)("g CaO")))) = "0,68 g CaCO"_3`

`"% CaCO"_3 = ("0,68" color(red)(cancel(color(black)("g"))))/(100 color(red)(cancel(color(black)("g")))) × 100 % = "0,68 %"`