During the split between the shiite and sunni muslims, the shiites argued that a. the position of caliph should be eliminated b. the people should elect a new caliph c. only a relative of muhammad could be caliph d. two caliphs should be leaders of islam

C. only a relative of Muhammad could be caliph

So  if  the sum of the enthalpies of the reactants is greater than the products, the  reaction  will be  exothermic.  if  the products side has a larger enthalpy, the  reaction  is  endothermic. you may wonder why  endothermic reactions, which soak up energy or enthalpy from the environment, even happen