[sig646]

I have been trying for more than an hour on these 2 problems... Could someone please help me?

The first one:
Calculate the new concentration when 25 ml of 1.2 mole/Litre C2H4O2 is thinned with 30 ml of water.

the second:
In a supply closet stands a bottle with 0.5 litre of NaCl. The concentration is 0.53 mole/litre. You need to have a solution (kitchen salt solution it says which can contain 7 grams/litre. Calculate how much litres solution you can make at the maximum if you utilise the full supply of the bottle.

[thetada]

With question 1, does it help if you rephrase it the volume increases from 25 to 55ml?

[sig646]

Not really, sorry, I'm really lost.

[sig646]

Oh wait... I was just able to solve the first one!
So if anyone could just help me with the seconde one, that would be awesome. Thanks.

[Borek]

Would it help if you convert 7 g of NaCl per liter to moles per liter?