Final answer:
Polyatomic gases contain the most heat, given the same number of atoms/molecules at a given temperature.
Step-by-step explanation:
The type of gas that contains the most heat, given the same number of atoms/molecules at a given temperature, is polyatomic gases.
This is because polyatomic gases have more internal degrees of freedom and can store more energy compared to monatomic or diatomic gases.
For example, polyatomic molecules have additional rotational and vibrational degrees of freedom, in addition to translational motion.