A 0.114 g Fe sample required 18.7 ml EDTA solution. Find the % Fe2O3( Fw=159.6882 g/mol) in the sample. If 25.0 ml EDTA required 15 ml of 1.1*10 ppm CaCl, (Fw = 110.985 g/mol)

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.

the answer would be a

the answer is c. nacl