A solution of salt and water contains 50 grams of water per 100 milliliters of the solution. If 1 mole of water weighs 16 grams, _____ moles of water would be present in 25 milliliters of the solution. [Round off your answer to two decimal places]

Question

mathmate · Answer

It doesn't look like it's a chemistry question:
- Saturated salt solution contains way more than 50 grams of water per 100 ml!
- 1 mole of water weighs 18 g (not 16).
Can you check the question?

anonymous · Answer

thats how it is its just a question for my extra credit summer course theres nothing else besides that

anonymous · Answer

Its for math not chemistry

mathmate · Answer

That's ok, we will assume we're in a different galaxie out in the Milkyway!  :)

Use proportions:
100 mL solution : 50 g H2O
25 mL : x g  
x=? g H2O
solve for x, and put in following proportion.

16 g  H2O: 1 mol
x g  H2O : k mol

k is your answer in moles.

anonymous · Answer

^.^ hehe thanks very much now that i see how you made it i finally understand it thanks :)

mathmate · Answer

You're very welcome!   :)