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Question 1 of 3

75 g of Coal Tar Paste contains 4.5 g of Zinc Oxide. What percentage (by mass) of the paste is Zinc Oxide?

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%
6 % of the paste is Zinc Oxide.

Percentage = Amount of Specified Item x 100 %
Total Amount

Percentage of Zinc Oxide in paste = 4.5 x 100 %
75
Percentage of Zinc Oxide in paste = 6 %

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Question 2 of 3

The source formula for Compound Benzoic Acid Ointment BP 1988 is:
Benzoic Acid                   60 g
Salicylic Acid                   30 g
Emulsifying Ointment      910 g

What percentage of the ointment is Benzoic Acid?

Type in your answer and PRESS ENTER.
%
6 % of the ointment is Benzoic Acid.
Percentage = Amount of Specified Item x 100 %
Total Amount

Percentage of Benzoic Acid in ointment =   60    x 100 %
1000
Percentage of Benzoic Acid in ointment = 6 %

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Question 3 of 3

15 ml of eye drops contain 1.95 ml of Distilled Witch Hazel. What percentage (by volume) of the solution is Distilled Witch Hazel?

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%
13 % of the solution is Distilled Witch Hazel.

Percentage = Amount of Specified Item x 100 %
Total Amount

Percentage of Witch Hazel in the solution=   1.95    x 100 %
15
Percentage of Witch Hazel in the solution = 13 %

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