Atoms form chemical bonds to satisfy the rule and to become you in advance

Atoms form chemical bonds to satisfy the OCTET rule and to become STABLE.

The noble gases are the only set of elements that have 8 electrons in their outermost shells and that is why they are stable and unreactive. Other elements in the periodic table have less than 8 electrons in their valence shells and thus, they usually undergo chemical reactions in order to have 8 electrons in their valence shells and to attain stability. The octet rules states that an element must have 8 electrons in its outermost shell in order to be stable.

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