Both calcite(CaCO3) and dolomite (CaMgC2O6) are used as a dietary calcium supplements.Calculate the mass percentage of calcium in each mineral..
2006-09-22 07:32:43 · 3 answers · asked by Anonymous in Science & Mathematics ➔ Chemistry
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.
2006-09-22 08:13:39 · answer #1 · answered by Roy G. Biv 3 · 0⤊ 0⤋
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:
http://physics.nist.gov/cgi-bin/Compositions/stand_alone.pl?ele=&all=all&ascii=html&isotype=some
2006-09-22 15:08:36 · answer #2 · answered by Helmut 7 · 0⤊ 0⤋
you must calculate the Molecular weight of your compounds then you use this equation,, mass % = (weight of Ca / Molecular weight )x 100
2006-09-22 16:58:34 · answer #3 · answered by source_of_love_69 3 · 0⤊ 0⤋