Question

What does positive ΔH tell about a reaction?

Answer 1

hi dear..

__________Answer________

Energy absorbed from the surrounding.

______EXPLANATION_______

Enthalpy change is equal to the energy supplied as heat at constant pressure

ΔH = dq

So , if ΔH is positive, energy is given to the system from the surrounding in the form of heat.

For example if we supply 36 kJ of energy through an electric heater immersed in an open beaker of water, then the enthalpy of the water increases by 36 kJ and we write ∆H = +36 kJ.

Conversely if ΔH is negative, then heat is given by the system (reaction vessel) to the surrounding.

hope it helps.....

Answer 2

$\huge\bold\pink{hello!!}$

HERE IS UR ANSWER

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∆H tells the change in heat energy.