Inorganic Chemistry> Find the percentage of calcium in calcium...

Find the percentage of calcium in calcium carbonate (CaCO₃)

Cricket live streamer , 7 Years ago

Grade 10

2 Answers

The Hounds Of Justice

Molecular mass of CaCO₃ = 40+12+(16*3) = 100u

Atomic mass of Ca= 40

Percentage of Ca= (40/100)*100= 40%

Approved

Last Activity: 7 Years ago

Arun

Write out the formula first: CaCO3. Next, find the mass of each of them by using the PToE (below the element symbol).

Ca - 40.08g/mol
C - 12.01g/mol
O - 3*16.00g/mol = 48.00g/mol

Add them all together to find the molar mass:
40.08
12.01
+ 48.00
---------------
100.09g/mol

So you have the molar mass. Now you want to find the percentage of calcium, so get the mass from above and divide it by the whole molar mass.

40.08g/mol divided by 100.09g/mol (times this by 100 to get a percent).

Your answer would be 40.04%. Hope this helps!

Last Activity: 7 Years ago