The first-order reaction of a compound has a half-life of 55 min. Calculate the percentage of that compound that remains after 3.40 hr .

The answer is letter c

The answer is not c

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).