What is enthalpy?
the total concentration of the system
the total heat content of the system
the total pressure of the system
the total internal energy of the system

Enthalpy is the total heat content of the system.

To add, Enthalpy is a measurement of energy in a thermodynamic system. It is the thermodynamic quantity equivalent to the total heat content of a system. Enthalpy is equivalent to the internal energy of the system plus the product of pressure and volume.

so what is the problem with your lab report and whats the subject of the lab report? i will you

air

in a tire you fill a tire with air

then a couple days later you check the air pressure in the tire

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