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Chem3 Ch5.p1

Chemical Composition: Conversions

Conversions:ProcessAnswer
Avogadro's Number 1 mole = 6.022 x10 to the 23 atoms
1 mole Si =6.022 x 10 to the 23 Si atoms/1 mole Si
Molar Mass of SiO2 (g/mol) = 28.09 g/1 molle Si + (2 x 16g/1 mole O2)=60.09g SiO2/mole SiO2
Molar Mass of CaCl2 (g/mol) = 40.078 g/1 mole Ca + (2 x 35.453 g/1 mole Cl)= 110.984 g/1 mole CaCl2
Average atomic mass of Ne =Average atomic mass of Ne isotopes ((20)Ne + (21)Ne + (22)Ne) = (19.99 amu + 20.99 amu + 21.99 amu)/3 = 20.18 amu
Grams to Moles No. of mole atom (mol) = mass (g)/molar mass (g/mol)
No. mol of Si = 30.5 g of Si X 1 mole Si/28.09 g Si = 1.09 mol Si
Moles to Atoms No. of atoms = No. of mole of atom (mol) X 6.022 x 10 to the 23 atoms/mol
No. of atoms Si = 1.09 mole Si X 6.022 x 10 to the 23 atoms Si/ mol Si = 6.56 x 10 to the 23 atomsSi
Atoms to Grams Mass (g) = No. of atoms X molar mass (g/mol)/6.022 x 10 to the 23 (atoms/mol)
Grams to Molecules No. molecules = mass (g) of sample /molar mass (g/mol) X 6.022 x 10 to the 23 molecules/mol
No. of CaCl2 molecules = 49.3 g Cacl2 X 1mol CaCl2 /110.984 g X 6.022 x 10 to the 23 atoms CaCl2/1 mol CaCl2 = 2.67 x 10 to the 23 molecules
Created by: nikkimem32 on 2006-03-09



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