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chloe ko.
christina chow.
mr. doktor's chemistry class
block g

home. mrdoktor.

In a chemical reactions, usually one chemical gets used up before the other.
- the chemical used up first is called limiting reactant
- once it is used up the reactaion stops
- L.R [liming reactant] determine the quantity of products formed.
-to find the L.R assume one reactant is used up. Determine how much of this is required

Example:
Find the L.R when 2.6mol of Iron when it reacts with 3.9mol of Oxygen
4Fe + 3O₂ --> 2Fe₂O₃
2.6mol x 3/4 =1.95mol
                           = 2mol
3.9mol x 4/3 = 5.2mol







If 1.2g of Silver Nitrate react with 9.9g of Sodium Chloride determine how much of Sodiom Nitrate is formed_.
AgNO₃ +NaCl----->AgCl+NaNO₃
1.2g x 1mol  x 1  x 58.5g = 0.41 g
       _{169.9g     1      1 mol
9.9g x 1mol   x} 1  x 169.9g  = 15.5g
            107.9g     _{1      1 mol.
                                                       = 16g of Silver Nitrate}