In which reaction are electrons transferred from one reactant to another reactant?
(1) 2ca(s) + o2(g) => 2cao(s)
(2) agno3(aq) + kcl(aq) => agcl(s) + kno3(aq)
(3) hcl(aq) + naoh(aq) => nacl(aq) + h2o(l)
(4) h3o+(aq) + oh-(aq) => 2h=o(l)

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