Will rate thumbs up, thank you! Which aqueous solution is likely to have a highe

Question

Will rate thumbs up, thank you! Which aqueous solution is likely to have a higher boilng point, 0.50m KBr or o S0m Na,$o.7 Why? 15. The freezing point of a solution that contains 1.00g of an unknown compound dissolved in 10.0 g of benzene is found constant of benzene to be 2.07 C. The freezing point of pure benzene is 5.48 C The molal freezing point depression is 5.12 °C/molal. What is the molar mass of the unknown compound? 16. What is the osmotic pressure (at 25'C) of t seawater? It contains approximately 35.0 grams of NaCl per liter. (Seawater contains other stuff, but we'll ignore it.) Look up the Osmotic Pressure in your blood and discuss why sea water will kill you if you d that it is more to do with kidneys than blood. but that is too much biology for this worksheet.) 17.

Explanation / Answer

15)

ANS)

Here sahows that the stepswise

Step 1: Calculate the freezing point depression of the solution.

deltaTf = (Freezing point of pure solvent) - (Freezing point of solution)
(5.48 oC) - (2.07 oC) = 3.41 oC

Step 2 : Calculate the molal concentration of the solution using the freezing point depression.

deltaTf = (Kf) (m)
m = (3.41 oC) / (5.12 oC/molal)
m = 0.666 molal

Step 3: Calculate the molecular weight of the unknown using the molal concentration.

m = 0.666 molal = 0.666 mol A / kg benzene

moles A = (0.66 mol A / kg benzene) (0.010 kg benzene) = 6.66 X 10-3 mol A

molecular weight of A = (1.00 g A) / (6.66 X 10-3 mol A)

molecular weigh of A = 151 g/mol

finally we get the molecular weight of A=151g/mol

14)

Ans)

1.Here Na2CO3 solution is likely to have a higher boiling point , this is because it basically produces more ions than NaI when it dissociates in water .

2.

This isbasically because Na2CO3 solution has a higher osmotic pressure produced from the increased number of ions

17)

AnS)

Here that the cell membaranes or the cell acts as selectively permeble membranes.cells let water pass freely ,but strictly controlling the amount and type of other ions that can pass the membrane

And hence, subjects the cells to the same osmotic pressure we observe in other osmotic systems. This means that cells thrive best in when placed in environments where the solution they are immersed in have the same concentration of solute as the cell interior, i.e. in an Isotonic solution.

If we place a cell in a watery solution which contains more solute, i.e. a Hypertonic solution, (in this case sea water) water will rush out of the cell, causing it to shrink and become dysfunctional, a process called crenation

. If we place the cell in water with fewer solutes, i.e. Hypotonic solution, water will rush into the cell, causing it to swell and eventually rupture in haemolysis.

These osmotic movements are the reason why drinking sea water causes dehydration or lethal for normal human being

THIS IS ABOUT THE INFORMATION FOR SEA WATER WILL LILL IF YOU DINK IT

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