Which is more concentrated, a solution containing 10g of NaCl in 100 g
of water OR a solution containing 10 g of NaCl in 90 g of water? How do
you know your answer is correct?
help!!!

The answer is the solution containing the 90g of water.

Explanation:

Because both solutions have the same amount of the sodium chloride, the concentration would be the same if they both had the same amount of water.

Because the second solution has less water, there is more of the sodium chloride per each drop of water.

I hope this helps :)

a police officer and a ambulance

a:

by the combination of an unlimited number of elements