which expression is correct?

When a reaction produces heat, the heat flows

The content of heat of a system is

Which reaction is exothermic?

what is the enthalpy (heat) of the reaction 2C₂H₂(g) + 5O₂(g) ⟶ 4CO₂(g) + 2H₂O(g) +2511.6 kJ ?

If the H(reactants) = 340 J and H(products) = 200 J, what is the enthalpy (heat) of the reaction?

Which reaction happens in an ice pack?

After an exothermic reaction

If the H(reactants) = 340 J and H(products) = 200 J, what is the enthalpy (heat) of the reaction?

When a reaction produces heat, the heat flows

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