Mp г 25 m г ? t C 20

It seems you are asking for help with a problem involving the relationship between mass (m), temperature (t), and pressure (p), but the notation is a bit unclear. If you are referring to a physical chemistry problem, could you please provide additional context or clarify your question? For example, are you looking to calculate something specific related to gas laws, thermodynamics, or another area? Additional details will help me assist you better.