Which of these accurately describes why an acid is strong? an acid is strong when it undergoes a reverse reaction. an acid becomes strong when it is mixed with a base. an acid’s strength is due to the amount present in a solution. an acid is strong when it dissociates completely in water.

An acid is strong when it completely dissociates in water.

Take, for example, hydrochloric acid (HCl), which is a strong acid.

When HCl is put into water, the compound will dissociate completely, yielding hydrated H+ and Cl- ions. This dissociation is pretty close to 100%.

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