A reaction (produces or absorbs) kJ when 2 moles of acetylene (C2H2) reacts.
Does it produce or absorb?
To determine whether the reaction produces or absorbs energy, we need to look at the balanced chemical equation for the reaction between acetylene (C2H2) and another substance.
Since the problem does not provide information on the other substance involved in the reaction, we cannot determine whether the reaction produces or absorbs energy based solely on the identity of acetylene.
Therefore, we need additional information about the reaction in order to determine the energy change.