Question

Which of the following is a molecule? 1 point K Ne CO

Answer 1

Answer:

molecule may be homonuclear, that is, it consists of atoms of a single chemical element, as with oxygen (O2), or, it may be heteronuclear, a chemical compound composed of more than one element, as with water (H2O). Oxygen is diatomic molecule and does not exist as monoatomic species.

Explanation:

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Answer 2

Answer:

K

Explanation:

Number of molecules = Number of moles ×N  

A

​  

 

Hence, the more the number of moles the more is the number of molecules.

4 g of hydrogen corresponds to  

1

4

​  

=4 moles of it, whereas 4 g He corresponds to  

4

4

​  

=1 mole of it.

22.4 L oxygen at STP corresponds to  

22.4

22.4

​  

=1 mole.

1 mole carbon dioxide is obtained by heating 1 mole of calcium carbonate.

CaCO  

3

​  

⟶CaO+CO  

2

​  

 

Hence the number of molecules is maximum in option A.