[nmego]

For the first question, I think it obvious that hydrogen gas evolves, but I'm not sure whether it is endothermic or exothermic, of course, Aluminum is more active than Hydrogen.

As for the second question, I think it was solved by the law:

Concentration1 / number1  = Concentration2 / number2

So,

0.1 / 22 = x / 10 and just solve for x, but I'm not sure

[chenbeier]

For the first one you have to consider, get it hot or not? Then decide.

The second one  you have to calculate how much mole H⁺ you have. What is the formula of sulfuric acid? These H⁺ has to be neutralized.

[nmego]

For the first one you have to consider, get it hot or not? Then decide.

The second one  you have to calculate how much mole H⁺ you have. What is the formula of sulfuric acid? These H⁺ has to be neutralized.

I think it wouldn't be hot, therefore it would be endothermic?

It would be H₂SO₄ + 2NaOH = Na₂SO₄ + 2H₂O

We see that the number of moles for NaOH is about 2 for each 1 mole of H₂SO₄

[chenbeier]

For the first one you had 50% chance to get the right answer, but you choose the wrong one.It gets really hot . The heat helpes to clean the pipework. So its exotherm.


Second one is correct, now you can calculate the concentration.

[Borek]

As for the second question, I think it was solved by the law:

Concentration1 / number1  = Concentration2 / number2

There is no such law, whoever taught you that, was wrong.

However, this is a simple stoichiometry, start with the reaction equation and follow from that.