A 300M solution of NaCl has a density of 1.07 g/mL what is the molality of the s

Question

A 300M solution of NaCl has a density of 1.07 g/mL what is the molality of the solution? Molality: ____________ Indicate the type of solute-solvent interactions operating in each of the following solutions. I _2 in CHCI _3 ___________ NH3 in water ____________ MgCl _2 in water ____________ HCI in CH _3 CN _________________ A solution was prepared by dissolving 0.40 g of a polypeptide (non-electrolite) in water to form 1.0L solution. The solution has an osmotic pressure of 4.92 times 10^-3 atm at 27 degree C. what is the molar mass of the polypeptide? Molar mass:__________________

Explanation / Answer

Que 5

Ans Given is Molarity = 3.0 , Density = 1.07

Molarity = Moles/ Lit and Molality = Moles/ Kg = Mole/Lit/Density

So, Molality = Molarity/Density

= 3.0/1.07

= 2.80 mol/Kg

que 7

Ans Molar mass is given by

Molar mass = WRT/PV

Where W = Weight of solute in g, R = Gas Constant (0.083 L bar Mol-1 K-1), T = temperature K, P = Osmotic Pressure

Molar Mass = 0.4 × 0.083 × 300/ 4.92 × 10-3× 1

= 2024.39 g/mol

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