When naming ternary compounds such as hno3, the structure of the compound predict the name of compound. which statement is not correct in naming this compound?

If I understand your question HNO3 is and acid, meaning it is an acid (meaning it should be able to donate protons or except electrons. If the draw the structure of nitric acid the Proton (H) the Hydrogen atom is not attached to any oxygen atoms and cannot be given away. It would be have to be attached to one of the oxygen atoms to "appear" as an acid

0.126 mol/L

Explanation:

The chloride ions come to the salts NaCl and KCl, which dissociates completely in water. So let's calculated how much moles of Cl⁻ are formed for each salt, knowing that the molar masses are Cl = 35.5 g/mol, Na = 23 g/mol, and K = 39 g/mol.

MNaCl = 23+ 35.5 = 58.5 g/mol

MKCl = 39 + 35.5 = 74.5 g/mol

The number of moles is the mass divided by the molar mass, and 1 mol of the salts produces 1 mol of Cl⁻ :

nNaCl = 0.50/58.5 = 8.55x10⁻³ mol

nKCl = 0.30/74.5 = 4.03x10⁻³ mol

nCl⁻ = 8.55x10⁻³ + 4.03x10⁻³  = 0.01258 mol

The molar concentration is the number of moles divided by the solution volume (100 mL = 0.1 L):

0.01258/0.1 = 0.126 mol/L