All types of mole conversions

1.Conversions PARTICLE/ATOM/FORMULA UNIT-MOLES

•     Example; How many moles of Carbon atoms are there in 3.01x10^24C atoms?

  3.01x10^24C atoms x 1 mol C/6.022x 10^23C atoms = 5.00 mol C


2.Comversions MOLES-PARTICLES/ATOMS/FORMULA UNITS
   

• Example: How many CO2 molecules are present in 0.75 moles of CO2?

0.75mol CO2 x6.022x10^23molecules CO2/1  molCO2=4.5x10^23molecules CO2

•     Example : How many atoms of Oxygen are present in 0.75 mol CO2?

     0.750 mol CO2 x 6.022x10^23molecules CO2/1mol CO2 x 2atoms/1 molecule CO2= 9.03x10^23atoms O



3.Conversions MOLES-GRAMS
  

•  Example: What is the mass in grams of 2.04 moles of Carbon?

   Atomic mass of C= 12.0 u
    Molar mass of C= 12.0g/mole
  2.04mol C x 12.0g C/1mol C= 24.5gC



4.Conversion GRAMS-MOLES
  

•  Example: How many moles are there in 3.45 grams of Carbon?

   Atomic mass of C =12.0u
   Molar mass of C =12.0g/mol
   3.45g C x 1mol C/ 12.0g C= 0.287mol C

•   Example: How many moles are there in 6.2 grams of Magnesium chloride?

   Formula unit mass of Mgcl2= 1 Mg x 24.3u=24.3u
    2 Cl x 35.5u =71.5u/95.3u
   Molar mass of Mgcl2 = 95.3g/mol
   6.2 g Mgcl2 x 1mol MgCl2/ 95.3gMgCl 2= 0.065 mol MgCl 2