The molecules of two different elements, nitrogen and oxygen, make up about 99 percent of the air.
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Answer:
The nitrogen atom shares three bonding pairs and has one lone pair and has a total of 5 valence electrons.
Explanation:
Nitrogen - in its molecular elemental form, has an oxidation number of 0.
Answer: 2.8 moles of copper (Il) sulfide
will be produced from 2.8 moles of sulphur.
Explanation:
The balanced chemical reaction is:
According to stoichiometry :
1 mole of
produce = 1 mole of copper (Il) sulfide
Thus 2.8 moles of
will produce=
of copper (Il) sulfide 
Thus 2.8 moles of copper (Il) sulfide
will be produced from 2.8 moles of sulphur.