The titration of 17.20 mL of HCl solution of unknown concentration requires 12.53 mL of a 0.170 M NaOH solution to reach the equivalence point. What is the concentration of the unknown HCl solution in M?

the catch is that the top numbers are atomic masses the bottom numbers are the numbers of protons and electrons in an uncharged atom. they are the number of that atoms as you would find them on the periodic table. further, the numbers on the left are used to determine the missing numbers on the right

so here we go

atomic mass

239 + 1 = y + 134 + 3 combine like terms

240 = y + 137             subtract 137 from both terms

240 - 137 = y

103 = y

atomic number

94 = z +54 + 0

94 = z + 54               subtract 54 from both sides.

40 = z

answer

The answer is 65.3312

Is there any options, for this

The answer will be +250