A sample of hydrogen gas (H2) was heated until its original temperature of 305 K reached 463 K. If the final volume of the sample is 5.40 L, what was the original volume?

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).

Zinc contains about 30 protons