To find the minimum molar mass of protein 'A', given that glycine makes up 0.30% of it and has a molecular weight of 75 g/mol, we start by understanding that the minimum molar mass of the protein corresponds to the scenario where the protein contains exactly one glycine molecule. Let 'M' be the molar mass of protein 'A'. The fraction of the protein's mass due to glycine is given by: 0.30% = (mass of glycine / M) × 100 Express this as an equation: (0.30 / 100) = (75 / M) Solve for 'M': M = 75 / (0.003) = 25000 g/mol This value represents the molar mass of protein 'A' expressed as 25 × 103 g mol–1. Finally, confirm this value falls within the provided range, 25,25, which it does: M = 25 × 103 g mol–1 is within the expected range. Thus, the minimum molar mass of protein 'A' is 25 × 103 g mol–1.
