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1. Is it more correct to write H+ (aq) or H3O+(aq)? Explain.

Now, as far as I know, these both mean the same thing, but we'd prefer to write H+ to help understand pH level right? I'm not too sure.

2. In words, what is the mass of 1 mole of any molecule?

The mass of one molecule is avagadros number right?

3. How many milliliters of 1.0 M HCL have to be added to neutralize 50 mL of 0.25 M NaOH?

I have not a clue where to start, if someone could tell me a formula, or get me started on this, I may be able to finish it.

Much thanks!