Propane (C3H8) burns in a combustion reaction. How many grams of C3H8 are needed to produce 80.3 mols CO2 ?

One similarity and one difference between an element and a mixture of elements

Which substance—wood or silver—is the better thermal conductor? a thermal conductor is a material that requires very little heat energy to change its temperature. explain your answer.

Ajar contains a certain substance. which observation would show that the substance must be either a solid or a liquid?