Ireally need with this science questionme

B, Because the classroom started with cylinder cups they should add 7mL into the cup and then transfer the 7mL on the cups

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.