Mole concept

One dozen of methane molecules is 12 molecules, right?

One methane molecule - CH₄ - is five atoms, one carbon and four hydrogens, right?

So one dozen of methane molecules contains - together - 5 dozen of atoms of all kinds, right?

Now replace "dozen" with a "mole" and repeat whole exercise.

Please show how you approached the H⁺ question. It is not difficult - it is almost a direct application of the concentration definition, just both volume and number of moles are not given directly, but have to be calculated.

Actually it IS a difficult question, but for reasons you don't know yet. Don't worry, you are expected to ignore 90% of what is really happening in the solution. At the same I would NEVER ask such a question. I hate questions that are wrong by definition.

 

Mole is an overgrown dozen. Dozen is 12 objects, mole is 6.02x10²³ objects.

You started right - you correctly calculated number of moles of H⁺ from both sources. However, while you can add numbers of moles, you can't add concentrations.

You know how many moles of H⁺ from each source you have. Can you calculate total number of moles? Do you know final volume? Can you calculate concentration using both number of moles and volume?

 

No idea what the question is. Why what? Why you can replace "dozen" with a "mole"? Because both refer to the same - number of objects. Just like gross (dozen of dozens, or 144 objects) or threescore (60 objects). Numbers are different, but the idea is identical.

It counts as one mole of diatomic molecules, or two moles of atoms. Usually when we say "mole of oxygen" we mean "mole of diatomic molecules".

Close, but you forgot that sulfuric acid is diprotic.