All GRE Subject Test: Chemistry Resources
Example Questions
Example Question #11 : Analytical Chemistry
Determine the percentage yield if the expected yield of in the above reaction is 40.911 grams but the actual yield is 35.322 grams.
In chemistry, percentage yield is a term used to quantify the efficiency of a chemical reaction. In order to calculate this quantity, the value for the actual yield and theoretical yield is needed. The actual yield is the amount of product obtained during a chemical reaction. The theoretical yield is the maximum amount of product possible to be obtain by a chemical reaction which is based on the amount of reactants used. Below is the formula needed to calculate the percentage yield.
Example Question #1 : Other Statistics
0.0031 moles of was reacted with 0.0071 moles of
giving an actual yield of 0.1733 grams of
. What is the percent yield of this reaction?
is the limiting reactant because based on the equation,
and
react in a 1:1 mole ratio. However, there is 0.0040 moles more of
than
present. Therefore the amount of
produced is limited by the amount of
present in the reaction. Based on the equation, for every 1 mole of
reacted, 1 mole of
was produced:
Therefore,
Example Question #1 : Other Statistics
Determine the percentage yield if the expected yield of in the above reaction is 1.2124 grams but the actual yield is 0.9749 grams.
In chemistry, percentage yield is a term used to quantify the efficiency of a chemical reaction. In order to calculate this quantity, the value for the actual yield and theoretical yield is needed. The actual yield is the amount of product obtained during a chemical reaction. The theoretical yield is the maximum amount of product possible to be obtain by a chemical reaction which is based on the amount of reactants used. Below is the formula needed to calculate the percentage yield.
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All GRE Subject Test: Chemistry Resources
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