How many grams of ketoprofen powder is required to be mixed to Petravan® cream base to make 180  g of ketoprofen 40 % (w/w) cream?

Macroscale and Microscale Organic Experiments
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ISBN:9781305577190
Author:Kenneth L. Williamson, Katherine M. Masters
Publisher:Kenneth L. Williamson, Katherine M. Masters
Chapter4: Recrystallization
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19. How many grams of ketoprofen powder is required to be mixed to Petravan® cream base to make 180 
g of ketoprofen 40 % (w/w) cream?

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