A protein has been isolated as a salt with the formula Na20P (this notation means that there are 20 Na+ ions associated with a negatively charged protein P20−). The osmotic pressure of a 10.0 mL solution containing 0.207 g of the protein is 0.295 atm at 25.0°C. (a) Calculate the molar mass of the protein from these data. g/mol (b) Calculate the actual molar mass of the protein.

a) 36,051.81 g/mol is the molar mass of the protein.

b) The actual molar mass of the protein is 757,087.96 g/mol.

Explanation:

Osmotic pressure of the solution =

Temperature of the solution , T= 25.0°C=25.0+273 K=298 K

Concentration of solution = C

van't Hoff factor = 20 +1 = 21

Moles of protein = n

Volume of solution = V = 10.0 mL = 0.010 L

Mass of  protein = 0.207 g

Molar mass of protein = M

Moles of protein(n) =

36,051.81 g/mol is the molar mass of the protein.

b)

Actual molar mass of protein = M'

van't hoff factor = 21

The actual molar mass of the protein is 757,087.96 g/mol.

metals are good conductor of electricity. it has free electrons on their surface. according to electron pool theory, each atom present in a metal crystal losses all of its valence electron and as a result a pool of free is form. these pool of electrons are free to move and   conduct electricity easily   while making metal as good conductor.

the correct answer is a. the ability of electrons to flow throughout the metal.

if it's not useful, feel free to report for mistake in answer.