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IB Chemistry: Quantitative Chemistry
Transcript of IB Chemistry: Quantitative Chemistry
and eggs are counted in dozens... Chemists count atoms in moles One mole of any substance contains
6.02x10^23 atoms of that substance Answer: 1.2x10^24 hydrogen
fluorine Diatomic Molecules chlorine
iodine 6.02x10^23 x 2 =
1.2x10^24 Relative Molecular Mass (2x12.01)+(6x1.01)+(1x16)=
46.08 Question Calculate the number of moles in 4g of sodium hydroxide, NaOH Mass: 4g
Molar Mass: 40
Moles: 4g/40 = 0.100 REMINDER! Count the number of atoms in a molecule e.g 1 mole of NaCl Na atoms: 6.02x10^23
Cl atoms: 6.02x10^23
Total atoms: 1.2x10^24 eg. 2 moles of NaCl Na atoms: 1.2x10^23
Cl atoms: 1.2x10^23
Total atoms: 2.4x10^24