Calculate the bond energy per mole for forming all the bonds of water molecules, h2o.

Bond  energy  which  is   also  known   as   bond  enthapy  is  the  average    value  of  the  gas  phase  bond  dissociation  energy usually  at  298k  for  all bond  of  the  same type  within  the   same  chemical  species.

water  has  two  H-O  bond  that  is  O-H-O
bonb  energy  for  H-O  is  464k/j
therefore  o-H-O  =2  x464  =928  kj/mol 
since bond  breaking  process  is  exothermic   the  bond   energy  = -928  kj/mol

4- c, because all matter stays the same no matter what. it is still there. 5- b, because matter is known as mass. 6-c because, flammability is a chemical property. malleability is changing the shape of an object.