if a gas in a closed container is pressurized from 12.0 atmospheres to 13.5 atmospheres and its original temperature was 25.0 °C, what would the final temperature of the gas be?

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).

What are the options? physical property can be color, smell, opacity, viscosity, density, infra red spectrum, melting and boiling points, attraction and repulson to magnets, etc.

The answer to this question is a

The answer is fossil fuels.