3. If a solution contains 0.1 M glucose along with 0.15 M NaCl, what is the osmo

Question

3. If a solution contains 0.1 M glucose along with 0.15 M NaCl, what is the osmolarity of this solution?

a. 0.25 M b. 400 mOsm c. 250 mOsm d. 350 mOsm e. 0.4 M

I understand the answer is 400 mOsm can someone PLEASE dumb it down. I do not get it.

someone said "As 1 M glucose gives 1 Osm solution so 0.1M glucose will give 0.1OSM solution. and 1M NaCl gives 2Osm solution so 0.15M MaCl will give 0.3OSM solutin. hence the solution which contains 0.1M glucose and 0.15M Nacl osmolarity will be 0.4 Osm or 400mOsm. "

I DO NOT UNDERSTAND

Explanation / Answer

1 M solution will have 1 osmolarity.

NaCl contains 2 ions.

Therefore, 0.1 M glucose has an osmolarity of 0.1 Osm.

0.15 M of NaCl contains (2*0.15) 0.3 Osm.

Therefore, the osmolarity of the solution is,

= 0.1 + 0.3

= 0.4 Osm

= 400 mOsm

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