GRE Subject Test: Chemistry : Other Statistics

Study concepts, example questions & explanations for GRE Subject Test: Chemistry

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Example Questions

Example Question #11 :Analytical Chemistry

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Determine the percentage yield if the expected yield ofin the above reaction is 40.911 grams but the actual yield is 35.322 grams.

Possible Answers:

Correct answer:

Explanation:

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

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0.0031 moles ofwas reacted with 0.0071 moles ofgiving an actual yield of 0.1733 grams of. What is the percent yield of this reaction?

Possible Answers:

Correct answer:

Explanation:

is the limiting reactant because based on the equation,andreact in a 1:1 mole ratio. However, there is 0.0040 moles more ofthanpresent. Therefore the amount ofproduced is limited by the amount ofpresent in the reaction. Based on the equation, for every 1 mole ofreacted, 1 mole ofwas produced:

的refore,

Example Question #11 :Analytical Chemistry

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Determine the percentage yield if the expected yield ofin the above reaction is 1.2124 grams but the actual yield is 0.9749 grams.

Possible Answers:

Correct answer:

Explanation:

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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