In order to calculate the molar mass of the protein, we may manipulate the ideal gas equation: PV = nRT, where n is the number of moles. We also know that: n = m / Mr, where m is mass and Mr is molecular weight Thus, Mr = (mRT)/(PV) Here, the mass is in grams, the temperature is in Kelvin, the pressure is in atm and the volume is in liters, so the molar gas constant is 0.082057.
Mr = (3.6 * 0.082057 * (27 + 273)) / (0.0203 * 0.2) Mr = 21,828 g/mol Thus, the Mr of the protein is 2.18 x 10⁴ g/mol
(a) (i) All the elements of a group have similar chemical properties because they have same no. of valence electrons in their outermost shell. (ii) All the elements of a period have different chemical properties because they have different no. of valence electrons in their atoms.
