CHEMISTRY SHENANIGANS

Atomic Mass:
-The mass of 1 mole of atoms in an element
-The mass of 1.0 mol of 'C' atoms is 12.0g
-The mass of 1.0mol of 'Ca' atoms is 40.1g

Molecular Mass:
-The mass of 1.0 mole of atoms of an element or compound
N2, O2, H2, Br2, Cl2, F2, I2, P4, S8
-Assume all the rest are monoatomic
Element Symbol Formula Atomic mass Molar mass
Iodine I I2 126.9 g/mol 253.8g/mol
Silicon Si Si 28.1g/mol 28.1g/mol
Hydrogen H H2 1.0g/mol 2.0g/mol
Iron Fe Fe 55.8g/mol 55.8g/mol
Neon Ne Ne 20.2g/mol 20.2g/mol

Finding the molar mass of compounds:
-H2o
----> 2 H = 2(1.0) =2.0
----> 1 O = 1(16.0) =16.o
---->=18.0g/mol
-Find the molar mass of ammonium phosphate (NH4)3PO4
---->3N=2(14.0)
---->12H=12(1.0)
---->1P=1(31.0)
---->4O=4(16.0)
---->=149g/mol

Converting mass <----> moles:
-conversion factor g/mol or mol/g
-Find the mass of 2.5 mol of water
H20----> 18.og/mol 1mol/18.0g X 2.5mol =1/45g=45g
-Find the number of moles in 391g sample of nitrogen dioxide
NO2----> 1N=1(14.0), 2O= 2(16.0), =46g/mol
391 X 1mol/46g=8.5mol



In case you still don't understand, here's a short video:


And this is video is just for laughs: