A certain number of moles of hydrogen gas are held at 697 mmHg. The volume of the container is changed so that the new gas now occupies 32.77 liters and exerts a pressure of 586 mmHg. Assuming temperature is constant, what was the initial volume (in liters) of the gas in the cylinder

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.

We can't until we know what we are working with or on