The synthesis of a particular drug requires five steps. the yields for these steps are 98%, 45%, 66%, 87%, and 50%. what is the overall percent yield?

13%. When doing problems with linear reactions, convert the percents into decimals, then multiplying the decimals. So the calculation would be 0.98*0.45*0.66*0.87*0.50 = 0.13 = 13%. Remember to keep significant figures, since we were given only 2 significant figures at most, we keep only 2 in the final answer.

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It is a mixture. simply put, a compound must be pure, that is, of only one chemical structure and composition. a mixture is made of different chemical substances (i.e. elements, molecules, compounds) that are not chemically bonded to each other, but instead physically grouped together, as in the case of gasoline (a homogeneous solution).