Using the equation PV = nRT, do you recall what P, V, n, R and T stand for? They also need to be in certain units. This may or may not require converting. Do you still need help for this?
I agree with your conclusion that argon is the gas that moles can be calculated for. It is an ideal gas question in that the question asks for which gas can moles be calculated using \newcommand{\chem}[1]{\ensuremath{\mathrm{#1}}}
\chem{n=\frac{PV}{RT}}
It is not straight forward but it...
Usually when doing titrations of that nature, an acid-base indicator is used in the lab, such as phenolphthalein. To answer your #2 question, I would take a look at your procedure info to see if you need an acid-base indicator and to think why swirling the flask would be important.
Separate your initials and finals, and indicate given data versus needed. Also, as chemistree suggested, locate a gas law that applies to solve that type of question, when considering your given and needs.
Good luck!
First worksheet:
3. Part of your answer got cut off and it looks like it says only "Cl" on the right. I would double check that equation balancing.
4. You're off to a good start but count how many of each element you have on each side.
I didn't look at all of the rest but I did look at...