Why physical and chemical properties are found among the nonmetals?

Because the elements they tend to gain electrons to form anions during chemical reactions, they are electronegative elements with high ionization energies, so they are non-lustrous, brittle and poor conductors of heat and electricity. They cannot react to water as its their chemical property due to being unable to break the bond between H and O in water. The non-metals cannot reduce hydrogen by donating electrons.

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

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