What Is A Mole?
In chemistry, a mole unit is used as a measuring unit. Just like how Kg or Lb is used to measure the weight of an item, so too can a mole measure the numbers of atoms within a molecule.
Mole Problem Example
Find the amount (g) of Oxygen need to burn 60 g of ethane (C2H6).Solution
Find the number of moles in 60 g of ethane.
Molecular mass of C2H6 is (2×12)+(6×1) = 30 g/mol
Therefore, (60 / 30)= 2 mol of C2H6
7 O2 + 2 C2H6 => 4 CO2 + 6 H2O
7 mol of oxygen react with 2 mol of ethane to give 4 mol of carbon dioxide and 6 mol of water.
Molecular mass of O2 = (2x16) = 32g / mol.
Therefore, (32 g / mol) * (7 mol) = 224 g of O2 needed.
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