The Mole. Mass Relationships and Avogadro’s Number. Relative Mass . It is possible to determine the mass of an atom without knowing the mass of a single atom. This procedure involves comparing the masses of equal numbers of atoms. Ex: Oranges: 2160g = 3 = 0.600 Grapefruit: 3600g 5
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Mass Relationships and Avogadro’s Number
Ex: Oranges: 2160g = 3 = 0.600
Grapefruit: 3600g 5
The importance of Gay-Lussac’s results was recognized by Amadeo Avogadro, an Italian scientist.
1 atom C 2 atoms O
1mole C 2 moles O
115.8g O x 1mol O = 7.24 mol O
16.0 g O
4.66g O x 1mol O = 0.291 mol O
0.195mol Fe 0.195mol Fe
How many moles of HCl are contained in 1.45L of a 2.25M solution?
2.25M = 2.25 mol/ 1L of solution
1.45L X 2.25mol = 3.26 molHCl