β-carotene is the most important vitamin A. Its molar mass can be determined by measuring the osmotic pressure generated by a given mass of β-carotene dissolved in the chloroform solvent. Calculate the molar mass and β-carotene if 10.0 mL of a solution containing 0.00768 g of β-carotene it has an osmotic pressure of 0.035 atm at 25 °C. Consider that the constant of ideal gases R is 0.082057 L. atm/K. mol.