When a certain free element (which is solid at room temperature) is heated, it forms vapor molecules containing 2 atoms each. The gas effuses at a rate of 14.0 mL per minute. If neon gas effuses at a rate of 25.0 mL per minute, find the identity (name) of the element.

What’s the solution?

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).

Ibelieve it's temperature! i'm not 100% sure.