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HIGHER GRADE CHEMISTRY CALCULATIONS

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Calculation of percentage yield. Percentage yield is calculated using the formula: ... Worked example. ... the theoretical yield using the balanced equation: ... – PowerPoint PPT presentation

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Title: HIGHER GRADE CHEMISTRY CALCULATIONS


1
HIGHER GRADE CHEMISTRY CALCULATIONS
  • Calculation of percentage yield.

Percentage yield is calculated using the
formula- percentage yield
x 100 The actual yield is
given in the question. The theoretical yield
is calculated from the balanced equation.
actual yield theoretical yield
Worked example. In a reaction 320 kg of sulphur
dioxide reacted with oxygen to form 360kg of
sulphur trioxide. Calculate the percentage yield.
Find the theoretical yield using the balanced
equation-
2SO2 O2 ? 2SO3
2 mol ? 2 mol
128.2 g ? 160.2 g
128.2 kg ? 160.2 kg
320 kg ? 399.9 kg
2
  • Calculation of percentage yield.
  • Calculations for you to try.
  • 0.5 tonnes of hydrogen reacts with excess
    nitrogen to form
  • 0.66 tonnes of ammonia.
  • N2 3H2 ? 2NH3
  • Calculate the percentage yield of
    ammonia.

N2 3H2 ? 2NH3
3 mol ? 2 mol
6 g ? 34 g
6 tonnes ? 34 tonnes
0.5 tonnes ? 2.83 tonnes
Higher Grade Chemistry
3
  • Calculation of percentage yield.

Calculations for you to try. 2. Ethene
reacts with steam to ethanol C2H4
H2O ? C2H5OH Calculate the percentage
yield of ethanol when 140g of ethene
reacts to form 170 g of ethanol.
C2H4 H2O ? C2H5OH
1 mol ? 1 mol
28 g ? 46 g
140 g ? 140/28 x 46 g ?
230 g
Higher Grade Chemistry
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