১১ মোল কার্বনিক এসিডের আণবিক ভর কত?
To solve this problem, let's analyze it step-by-step:

Step-1: Here, we know that the chemical formula of Carbonic acid is H₂CO₃

Step-2: The atomic mass of H (Hydrogen) is 1, atomic mass of C (Carbon) is 12, and the atomic mass of O (Oxygen) is 16.

Step-3: So, total mass for 1 mole of  H₂CO₃ is (1*2 + 12 + 16*3) = 62

Step-4: We have to find the mass for 11 moles of  H₂CO₃. So, mass for 11 moles is 11*62 = 682         

#Answer: 682