A protein 'A' contains 0.30% of glycine (molecular weight 75). The minimum molar mass of the protein — Biomolecules Chemistry Question

💡 Solution & Explanation

**Step 1: Identify the key concept** The minimum molar mass occurs when there is exactly one glycine residue per protein molecule. The percentage composition formula is: % composition = (mass of element / molar mass of compound) × 100 **Step 2: Set up the equation** For glycine in protein A: 0.30 = (75 / M) × 100 where M is the minimum molar mass of protein A. **Step 3: Solve for molar mass** 0.30 = (75 / M) × 100 0.30 / 100 = 75 / M 0.003 = 75 / M M = 75 / 0.003 M = 25,000 g/mol **Step 4: Express in the required format** The question asks for the answer in the form: _____ × 10³ g mol⁻¹ 25,000 = 25 × 10³ g mol⁻¹ Therefore, the answer is **25**.