What is the equivalent weight of HNO3?

The equivalent weight of a compound is determined by considering its molar mass and the number of moles of reactive units it supplies in a reaction. For HNO3 (nitric acid), it acts as a strong acid that fully dissociates in solution, releasing one proton (H+) per molecule.

The molar mass of HNO3 can be calculated as follows:

• Hydrogen (H): 1.01 g/mol

• Nitrogen (N): 14.01 g/mol

• Oxygen (O): 16.00 g/mol (for three oxygen atoms, this totals 48.00 g/mol)

Adding these values together gives:

1.01 + 14.01 + 48.00 = 63.02 g/mol, which is often rounded to 63.0 g/mol.

In acid-base reactions, one mole of HNO3 provides one mole of H+ ions, meaning that the number of reactive units (protons donated) corresponds to one mole. Hence, the equivalent weight of HNO3 is equal to its molar mass because it donates one proton per molecule.

Thus, the equivalent weight of HNO3 is correctly stated as 63.0 g.