20. In which of the following are the symbol and name for the ion given correctly? NH4 +: ammonia; H +: hydride OH –: hydroxide; O 2-: oxide C2H3O2 –: acetate; C2O4 –: oxalite PO3 3 –:phosphate; P O4 –: phosphite

true

hope that

it would be d. henry moseley

hope this !

and sorry if i'm late. have a good rest of your day! : d

im pretty sure its b

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.