Question Detail
Question
Adenosine triphosphate (ATP) is the main energy storage molecule in cells. Its chemical formula is C₁₀H₁₆N₅P₃O₁₃. What is the mass percent composition of hydrogen?
Correct Answer
Option A is the correct answer.
Detailed Explanation
Molar mass of ATP = (10×12.01) + (16×1.008) + (5×14.01) + (3×30.97) + (13×16.00) = 120.1 + 16.128 + 70.05 + 92.91 + 208 = 507.188 g/mol. Mass of H = 16.128 g/mol. (16.128 / 507.188) × 100% = 3.18% (approx 3.16% depending on rounding).
Hint
Calculate the total molar mass and the mass of all hydrogen atoms in one mole.