Both calcite(CaCO3) and dolomite (CaMgC2O6) are used as a dietary calcium supplements.Calculate the mass percentage of calcium in each mineral
you must calculate the Molecular weight of your compounds then you use this equation,, mass % (weight of Ca / Molecular weight )x 100
let the element symbol represent it's standard atomic weight: (Ca/Ca*C*0*3)*100 percent 100/C*0*3 percent (Ca/Ca*Mg*C*2*O*6)*100 percent 100/Mg*C*2*0*6 percent (Ca just happens to cancel out in the calculation--curious!) If you don't have a chemistry text or handbook handy, you can find atomic weights in the following table: physics.nist /cgi-bin/Composit.
I'll show you how to do the first one. you work out the second one. E Q amu subtotal Ca 1 x 40 40 C 1 x 12 12 O 3 x 16 48 total amu 40 + 12 + 48 100 amu percent part divided by total times 100 % (40 / 100) x 100 40 it contains 40 % calcium now you do the second one. have fun learning.
