a wood board that is 5.1 cm x 10.2 x 243.8cm has a mass of 11.8kg will this board float in water? show all your proof

i just got this problem. it's 90.3

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.