A Metal Reacts with Acid to Form Hydrogen Gas as Shown

Multiple Choice

A metal reacts with acid to form hydrogen gas as shown by the following equation.

M(s) + 2 H⁺(aq) $\rightarrow$ M²⁺(aq) + H₂(g)
What is the atomic weight of this metal if 3.49 grams of the metal generates enough hydrogen collected over water to fill a bottle with a volume of 2.20 L at 25.0°C and 1.00 atmosphere pressure under conditions where the vapor pressure of the solution is 23.8 torr?

A) 19.4 g/mol
B) 37.6 g/mol
C) 38.8 g/mol
D) 40.0 g/mol
E) none of the above