How many Hydrogen atoms are present in this chemical equation: 3HCl

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Explanation:

If you considering in smaller scale You can simply say that “There is One Hydrogen atom Binds with Cl atom”. But when we are using this chemicals in Labs.

We talking in Moles

Mole is a quantity defining unit. Which is larger than you couldn't Imagine. 1 mole of pebbles can covered whole surface of earth.

1Mole=6.022×1023

It means 1 mole of Hydrogen is containing 6.022×1023 atoms. Be aware “Be aware thats a Quantity defining factor” Then we can get actual ratio of chemical formula..

HCL “The chemical formula”

H : 1 “Above chemical formula containing 1 atom to binds with another species”

Cl : 1 “Clorin also same as Hydrogen”

Then, You can multiply Ratio of atom by Avagadro Constant which is we pre defined as 1 Mole.

For understand it simply This statement would be helpful.

1 mole containing, Avagadro number of atoms

Hope This would be helpful!

c. heat could easily travel through the molecules in the air and escape/enter the flask. removing the air slows down the heat transfer.  

the answer would be a