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Calculating Percentage (%) Yield
2.3g of sodium reacts with an excess
of chlorine to produce 4.0g of sodium chloride.
What is the percentage yield?
2Na(s) + Cl2(g) 2NaCl(s)
(Ar reactants: Na=23 Cl=35.5 Mr product: NaCl= 58.5)
2.3g Na = 2.3 mol Na = 0.1 mol Na
23
Theoretically 0.1 mol Na should yield 0.1 mol NaCl
Theoretical yield of NaCl = 58.5 x 0.1 = 5.85g
% Yield = Actual yield x 100% % Yield = 4.0g x 100% = 68%
Theoretical yield 5.85g…read more

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Calculating Percentage (%) Yield
If 1.2g of magnesium reacts with an excess
of oxygen to produce 0.8g of magnesium
oxide...
What is the percentage yield?
2Mg(s) + O2(g) 2MgO(s)
(Ar reactants: Mg=24 O=16 Mr product: MgO= 40)
1.2g Mg = 1.2 mol Mg = 0.05 mol Mg
24
Theoretically 0.05 mol Mg should yield 0.05 mol MgO
Theoretical yield of MgO = 40 x 0.05 = 2g
% Yield = Actual yield x 100% % Yield = 0.8g x 100% = 40%
Theoretical yield 2g…read more

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Calculating Percentage (%) Yield
If 2g of calcium carbonate reacts with an excess of hydrochloric
acid to produce 1.11 g of calcium chloride....
What is the percentage yield?
2HCl + CaCO3 H2O + CO2 + CaCl2
(Mr values are: CaCO3 = 100 CaCl2 = 111)
2g CaCO3 = 2 mol CaCO3 = 0.02 mol CaCO3
100
Theoretically 0.02 mol CaCO3 should yield 0.02 mol CaCl2
Theoretical Yield of CaCl2 = 111 x 0.02 = 2.22g
% Yield = Actual yield x 100% % Yield = 1.11 x 100 = 50%
Theoretical yield 2.22…read more

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Sustainable Development and Atom Economy
Due to the damage being caused to
the planet by human activity,
environmentalists are calling for a
change of direction towards more
sustainable development.
Sustainable development is defined as that which:
"meets present needs for development without compromising the
ability of future generations to meet their own needs."
Sustainable development adopts strategies that allow for the
exploitation of natural resources, whilst minimising the damage
caused by the extraction of resources, or by the production of
finished products.…read more

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Sustainable Development and Atom Economy
The atom economy is an indication of the amount of starting
material that is converted into useful products.
As the amounts of available resources decrease it is vital that
resources are used as efficiently as possible.…read more

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