In both liquid water and ice, a hydrogen bond forms between

Hydrogen bond in liquid water and ice is a dynamic attraction between one hydrogen atom and two oxygen atoms of a neighboring water molecule. In hydrogen bonding, a proton is shared by two lone electron pairs while the oxygen nucleus attracts electrons better than the hydrogen nucleus. The hydrogen atoms are not only covalently attached to their oxygen atoms but also attracted towards nearby oxygen atoms.    

given:

mass of na = 115 g

excess cl2

to determine:

mass of nacl produced

explanation:

given reaction is-

2na(s) + cl2(g) → 2nacl(s)

since cl2 is in excess, na will be the limiting reagent

as per the reaction stoichiometry na: nacl = 1: 1

i.e. moles of na reacted = moles of nacl formed

now, # moles of na = mass of na/atomic mass

                                  = 115 g/23 g.mol-1 = 5 moles

therefore, moles of nacl = 5

molar mass of nacl = 58 g/mol

mass of nacl = 5 moles * 58 g.mol-1 = 290 g

ans: amount of nacl produced = 290 g