Question

What does positive $\mathrm{\Delta }H$ tell about a reaction?

Answer 1

Hint: The measurement of energy in a thermodynamic system is enthalpy. The overall content of heat in a system is enthalpy, which is equal to the system's internal energy plus the product of volume and pressure.

Complete answer:
$\mathrm{\Delta }H$ represents the enthalpy change in a reaction or the change in heat ($q$) of a reaction. If $\mathrm{\Delta }H$ is positive, it means energy is given to the system from the surrounding in the form of heat.
It is an endothermic reaction since the products have a greater energy level than the reactants and the net heat was absorbed.
Heat absorption is an endothermic process. It will have a positive enthalpy, and its surroundings will cool down. This is an exothermic reaction (negative enthalpy, heat release). When the reaction occurs, the temperature of the atmosphere may rise due to the increase in heat emitted by the device.
In thermodynamics, the heat energy produced is frequently employed to improve the system's energy or to perform beneficial work. Enthalpy is the energy associated with an open system, and it is frequently larger than or equal to internal energy.

Note:
The energy levels of the products and reactants are clearly depicted by $\mathrm{\Delta }H$. It also displays how much energy the organisms participating in a chemical process acquire or lose. Enthalpy change is measured in Joules.