Finding molar mass of an unknown acid
Your data is not enough to calculate molecular weight. You may have missed the mass of the solid acid you have weighed.
Let's assume you have weighed $a$ gram of acid. Then:
$Molecular Weight = \frac{Weight}{Moles_{acid}} = \frac{Weight}{2 \times Moles_{NaOH}} =  \frac{Weight}{2 \times Molarity_{NaOH} \times Volume_{NaOH}} = \frac{a}{2 \times 0.120 \times \frac{22.0}{1000}}$