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Question 1 of 3
Athlete's Foot Powder contains 1 % w/w Tolnaftate. If an athlete sprinkled an amount of powder containing 1 mg of Tolnaftate onto the feet, how much powder (in milligrams) was sprinkled?
% w/w
1
1 % w/w Tolnaftate means that there are 1 g of Tolnaftate in 100 g of powder
Thus: 0.001 g of Tolnaftate are in 0.001 x 100 g of powder
1
0.001 g Tolnaftate are in 0.1 g = 100 mg of powder
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Question 2 of 3
Zinc and Coal Tar Paste BP 1988 contains 38 % w/w Starch. If sufficient paste is made to contain 190 g of Starch, how much paste is made?
mass of product = mass of component x 100 g% w/w
38
38 % w/w Starch means that there are 38 g of Starch in 100 g of Paste
Thus: 190 g of Starch are in 190 x 100 g of Paste
38
190 g Starch are in 500 g of Paste
No, that is not the correct answer.
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Question 3 of 3
Dilute Ammonia Solution contains 10 % w/w ammonia. What is the mass of Solution if there is enough to contain 650 mg of ammonia?
% w/w
10
10 % w/w ammonia means that there are 10 g of ammonia in 100 g of Ammonia Solution
Thus: 0.65 g of ammonia are in 0.65 x 100 g of Ammonia Solution
10
0.65 g of ammonia are in 6.5 g of Ammonia Solution
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