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Are these correct (concentration/pH)?

Been a while since I actually did any chemistry, so I'd really appreciate if someone with a small amount of spare time could check if my answers are correct! :smile:

First question:
(a) 36.9 g of NaOH was completely dissolved in water and diluted to 250 cm³.
(i) What was the concentration of the solution (in mol L^-1)?
3.69 mol L^-1
(ii) What was the pH of the solution?
14.57
Second question:
(b) 83.9 g of HCl gas was completely dissolved in 1.37 L of water.
(i) What was the concentration of the solution (in mol L^-1)?
1.68 mol L^-1
(ii) What was the pH of the solution?
-0.225

Also would C-C=C-C(OH)=O be named But-2-enoic acid?

Many thanks for any confirmations/corrections!