Counting+atoms

Counting Atoms.

Every compound formula represents a molecule with a certain number of atoms in each. The subscripted number in each formula tells you how many of each type of atom is in the molecule. when there are parentheses, this means all of the atoms inside the parentheses are multiplied by the number. look at the first example for a better understanding.

__Compound Formula Atom count__

1) Magnesium Hydroxide- Mg(OH)2 1 Magnesium  2 Oxygen  2 Hydrogen

2) Calcium Carbonate- CaCO3 1 Calcium  1 Carbon  3 Oxygen

3) Aspirin- C9H8O4 9 Carbon  9 Hydrogen  4 Oxygen

4) Paradichlorobenzene- C6H4Cl2 <span style="font-family: 'Lucida Console',Monaco,monospace; font-size: 130%;">6 Carbon <span style="font-family: 'Lucida Console',Monaco,monospace; font-size: 130%;">4 Hydrogen <span style="font-family: 'Lucida Console',Monaco,monospace; font-size: 130%;">2 Oxygen

<span style="font-family: 'Lucida Console',Monaco,monospace; font-size: 130%;">5) Acetic Acid- C2H4O2 <span style="font-family: 'Lucida Console',Monaco,monospace; font-size: 130%;">2 Carbon <span style="font-family: 'Lucida Console',Monaco,monospace; font-size: 130%;">4 Hydrogen <span style="font-family: 'Lucida Console',Monaco,monospace; font-size: 130%;">2 Oxygen

<span style="font-family: 'Lucida Console',Monaco,monospace; font-size: 130%;">6)Trinitrotoluene- C7H5(NO2)3 <span style="font-family: 'Lucida Console',Monaco,monospace; font-size: 130%;">7 Carbon <span style="font-family: 'Lucida Console',Monaco,monospace; font-size: 130%;">5 Hydrogen <span style="font-family: 'Lucida Console',Monaco,monospace; font-size: 130%;">3 Nitrogen <span style="font-family: 'Lucida Console',Monaco,monospace; font-size: 130%;">6 Oxygen

<span style="font-family: 'Lucida Console',Monaco,monospace; font-size: 130%;">7) Calcium Dihydrogen Phosphate- Ca(H2PO4)2 <span style="font-family: 'Lucida Console',Monaco,monospace; font-size: 130%;">1 Calcium <span style="font-family: 'Lucida Console',Monaco,monospace; font-size: 130%;">4 Hydrogen <span style="font-family: 'Lucida Console',Monaco,monospace; font-size: 130%;">2 Phosphorus <span style="font-family: 'Lucida Console',Monaco,monospace; font-size: 130%;">8 Oxygen

<span style="font-family: 'Lucida Console',Monaco,monospace; font-size: 130%;">8) Pyrite- FeS2 <span style="font-family: 'Lucida Console',Monaco,monospace; font-size: 130%;">1 Iron <span style="font-family: 'Lucida Console',Monaco,monospace; font-size: 130%;">2 Sulfer

<span style="font-family: 'Lucida Console',Monaco,monospace; font-size: 130%;">9) Sucrose- C12H22O11 <span style="font-family: 'Lucida Console',Monaco,monospace; font-size: 130%;">12 Carbon <span style="font-family: 'Lucida Console',Monaco,monospace; font-size: 130%;">22 Hydrogen <span style="font-family: 'Lucida Console',Monaco,monospace; font-size: 130%;">11 Oxygen

<span style="font-family: 'Lucida Console',Monaco,monospace; font-size: 130%;">10) Heptane- C5H12 <span style="font-family: 'Lucida Console',Monaco,monospace; font-size: 130%;">5 Carbon <span style="font-family: 'Lucida Console',Monaco,monospace; font-size: 130%;">12 Hydrogen

<span style="font-family: 'Lucida Console',Monaco,monospace; font-size: 130%;">11) Sulfuric Acid- H2SO4 <span style="font-family: 'Lucida Console',Monaco,monospace; font-size: 130%;">2 Hydrogen <span style="font-family: 'Lucida Console',Monaco,monospace; font-size: 130%;">1 Sulfer <span style="font-family: 'Lucida Console',Monaco,monospace; font-size: 130%;">4 Oxygen

<span style="font-family: 'Lucida Console',Monaco,monospace; font-size: 130%;">12) Asbestos- H4Mg3Si2O9 <span style="font-family: 'Lucida Console',Monaco,monospace; font-size: 130%;">4 Hydrogen <span style="font-family: 'Lucida Console',Monaco,monospace; font-size: 130%;">3 Magnesium <span style="font-family: 'Lucida Console',Monaco,monospace; font-size: 130%;">2 Silicon <span style="font-family: 'Lucida Console',Monaco,monospace; font-size: 130%;">9 Oxygen

<span style="font-family: 'Lucida Console',Monaco,monospace; font-size: 160%;">When formulas are written with a coefficient in the from of the formula this means that there are that many molecules. In this case, the entire atom-count is multiplied by the number. Try the following and see how many atoms you can count.

<span style="font-family: 'Lucida Console',Monaco,monospace; font-size: 130%;">13) Silicon Dioxide- 3SiO2 <span style="font-family: 'Lucida Console',Monaco,monospace; font-size: 130%;">3 Silicon <span style="font-family: 'Lucida Console',Monaco,monospace; font-size: 130%;">6 Oxygen

<span style="font-family: 'Lucida Console',Monaco,monospace; font-size: 130%;">14) Iron Oxide- 4Fe2O3 <span style="font-family: 'Lucida Console',Monaco,monospace; font-size: 130%;">8 Iron <span style="font-family: 'Lucida Console',Monaco,monospace; font-size: 130%;">12 Oxygen

<span style="font-family: 'Lucida Console',Monaco,monospace; font-size: 130%;">15) Butane- 6C4H10 <span style="font-family: 'Lucida Console',Monaco,monospace; font-size: 130%;">24 Carbon <span style="font-family: 'Lucida Console',Monaco,monospace; font-size: 130%;">60 Hydrogen