Question

a) State the meaning of polyatomic ions. Mention any two examples.

(b) Write the chemical formula of copper nitrate.

(c) Calculate the mass of the following:

(i) 10 moles of sodium sulphite (Na2SO3)

(ii) 4 moles of aluminium atoms

[At. Mass of Na 23 u, S  32 u, O  16 u, Al 27 u]​

Answer 1

Answer:

1.polyatomic ion, also known as a molecular ion, is a charged chemical species (ion) composed of two or more atoms covalently bonded or of a metal complex that can be considered to be acting as a single unit. ... Examples: Carbonate (CO32-), sulphate (SO42-), nitrate - NO3- and hydroxide ions OH- are all polyatomic ions.

2. Cu(NO3)2