Category: etea Chemistry

No.	Topics.	No.	Topics.
1.	ALCOHOLS AND PHENOLS	2.	ALDEHYDES & KETONES
3.	ALKYL HALIDES	4.	ATONTIC STRUCTURE
5.	CARBOXYLIC ACIDS	6.	CHEMICAL BONDING
7.	CHEMISTRY OF HYDROCARBONS	8.	CHETVI ICAL EQUI LIBIRIUM
9.	ELECTROCHE]VIISTRY	10.	FUNDAMENTAL CONCEPTS OF CHEMISTRY
11.	FUNDAMENTAL PRICIPLES OF ORGANIC CHEMISTRY	12.	GASES
13.	INDUSTRIAL CHEMISTRY	14.	Limiting and Excess Reactants
15.	LIQUIDS	16.	Macro Mulecule
17.	Moles and Avogadro’s Numbers	18.	REACTION KINETICS
19.	S AND P BLOCK ELEMNETS	20.	SOLIDS
21.	THERMOCHEMISTRY & ENERGETICS OF CHEMICAL REACTIONS	22.	TRANSITION ELEMENTS
23.	Yield

To obtain an actual yield of 40g of a product with a 80% yield, one must start with reactants calculated to produce a theoretical yield of:

32 g
40 g
50 g
80 g

A lab procedure states that the reaction has a 95% yield. If the theoretical yield is 10 g, the expected actual yield is:

10 g
9.5 g
10.5 g
95 g

If you obtain 4.5 g of a product and the percent yield was 90%, the theoretical yield was:

4.05 g
4.5 g
5.0 g
9.0 g

The reaction 2Mg + O₂ → 2MgO has a theoretical yield of 40 g of MgO. If the reaction has an 85% yield, the mass of MgO produced is:

40 g
85 g
34 g
47 g

A student needs 5 g of a compound. The reaction to make it has a 50% yield. The student should start with enough reactants to theoretically produce:

2.5 g
5 g
7.5 g
10 g

The actual yield is 15 g and the percent yield is 75%. The theoretical yield is:

11.25 g
15 g
20 g
25 g

In the reaction Zn + S → ZnS, 65 g of Zn is supposed to make 97 g of ZnS. If the percent yield is 80%, the actual mass of ZnS produced is:

97 g
80 g
77.6 g
121.25 g

If the percent yield for a reaction is 90% and a student needs to produce 27 g of product, they should aim for a theoretical yield of:

24.3 g
27 g
30 g
90 g

The theoretical yield of a reaction is 10 moles. If the percent yield is 65%, the moles of product actually obtained are:

10 moles
6.5 moles
15.4 moles
65 moles

A reaction has a theoretical yield of 88 g. If its percent yield is 75%, the actual yield is:

117.3 g
88 g
75 g
66 g

A reaction has an actual yield of 35 g and a theoretical yield of 40 g. Its percent yield is:

80%
87.50%
90%
114%

If the percent yield is 85% and the theoretical yield is 200 g, the actual yield is:

85 g
170 g
200 g
235 g

When 1 mole of N₂ reacts with 3 moles of H₂, the theoretical yield of NH₃ is 34 g. If 17 g is produced, the percent yield is:

17%
34%
50%
100%

If the actual yield is 2.5 g and the percent yield is 50%, the theoretical yield must be:

1.25 g
2.5 g
5.0 g
10.0 g

A chemist expects to get 150 g of aspirin but only gets 120 g. The percent yield is:

75%
80%
90%
125%

The percent yield of a reaction that starts with 10g of reactant and produces 8g of product can only be calculated if the ______ is known.

excess reactant
rate of reaction
theoretical yield
actual yield

If 16g of CH₄ (1 mol) produces 36g of H₂O (actual yield), and the theoretical yield is 36g, the percent yield is:

50%
75%
90%
100%

The reaction of excess C₂H₄ with 64g of O₂ should produce 88g of CO₂. If 66g of CO₂ is obtained, the percent yield is:

50%
66%
75%
88%

A reaction with a theoretical yield of 5.0 g has a percent yield of 60%. The mass of product obtained is:

3.0 g
5.0 g
6.0 g
8.3 g

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