2Na + S -->Na2S What is the total number of moles of S that reacts when 4.0 moles of Na were
completely consumed?

gravity causes stares to cluster i think so

hi my dude or dudette

the enthalpy of formation of water is given as -285.8kj/mol, which states that the enthalpy of formation is negative.

negative enthalpy of formation indicates that the heat is released during the reaction process. the heat is released from reaction to the surroundings the enthalpy is expressed with a negative sign with the energy given out in the reaction process.

the formation of water takes place by giving out heat which is -285.8 kj/mol.

the answer your looking for is c).