ফসফরিক এসিডের ৫ মোলের আণবিক ভর কত?
To solve this problem, let's analyze it step-by-step:

Step-1: Here, we know that the chemical formula of Phosphoric acid is H₃PO₄

Step-2: The atomic mass of H (Hydrogen) is 1, atomic mass of P (Phosphorus) is 30.97 ≈ 31 (rounding) and the atomic mass of O (Oxygen) is 16.

Step-3: So, total mass for 1 mole of  H₃PO₄ is (1*3 + 31 + 16*4) = 98

Step-4: We have to find the mass for 5 moles of  H₃PO₄. So, mass for 5 moles is 5*98 = 490         

#Answer: 490