When an antacid tablet dissolves in water, the fizz is due to a reaction between sodium hydrogen carbonate (sodium bicarbonate, NaHCO3) and citric acid (H3C6H5O7). 3 NaHCO3(aq) + H3C6H5O7(aq) 3 CO2(g) + 3 H2O(l) + Na3C6H5O7(aq)
How many moles of Na3C6H5O7 can be produced if one tablet containing 0.0117 mol of NaHCO3 is dissolved?

answer: enthalpy

explanation:

for a exothermic reaction, the energy is released i.e. the energy of the products is lower than the energy of the reactants.

= enthaply

= energy of products

= energy of reactants

as , thus comes out to be negative. negative value of enthalpy shows that the reaction is exothermic.

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