Yield NCH with feedback

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Which equation should you use to calculate percentage yield?

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Which of these is not a reason for why the mass of product made is less than the maximum theoretical mass

some of the reactants may react in ways different to the expected reaction

some of the product may be lost when it is separated from the reaction mixture by filtering, for example

the reagents were made incorrectly

the reaction not going to completion, because it is reversible

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In an experiment, the theoretical yield is 3.2 g but the actual yield is only 2.4 g. Calculate the percentage yield

133%

7.68%

75%

1.33%

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What is the percentage yield of the student's reaction? Estimate a rough answer before doing the calculation. *

0.9 %

11.1%

111%

90%

Propene can be made by the dehydration of propan-2-ol.What is the percentage yield when 30 g of propene (Mr = 42.0) are formed from 50 g of propan-2-ol (Mr = 60.0)? *

86%

60%

81%

67%

An ester is hydrolysed as shown by the following equation. RCOOR' + H2O --> RCOOH + R'OH What is the percentage yield of RCOOH when 0.50 g of RCOOH (Mr = 100) is obtained from 1.0 g of RCOOR/ (Mr = 150)? *

33%

50%

75%

67%

Required

Hydrolysis of the ester, CH3COOCH2CH2CH3, produces ethanoic acid. In an experiment, 2.04 g of the ester was used and 0.90 g of ethanoic acid was produced. The percentage yield of ethanoic acid was: *

A 44

B 59

C 65

D 90

An excess of methanol was mixed with 12 g of ethanoic acid and an acid catalyst. At equilibrium the mixture contained 8 g of methyl ethanoate. The percentage yield of ester present was *

A 11

B 20

C 54

D 67

Butan-1-ol was converted into butyl propanoate by reaction with an excess of propanoic acid. In the reaction, 6.0 g of the alcohol gave 7.4 g of the ester. The percentage yield of ester was

A 57

B 70

C 75

D 81

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A student carried out the reaction below and obtained 6.8 g of potassium chloride. He calculated the percentage yield of the reaction to be 91%. KOH + HCl -> KCl + H2O. What is the maximum theoretical mass of potassium chloride that could be obtained from the student's reaction? (Estimate a rough answer without using a calculator first). *

0.75 g

75 g

7.5 g

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