Suppose you are performing a gas-producing reaction to experimentally determine the molar volume of the gas.

M
g
(
s
)
+
2
H
C
l
(
a
q
)
⟶
M
g
C
l
2
(
a
q
)
+
H
2
(
g
)

A sample of
M
g
produces 21.5 mL of
H
2
gas. The gas is collected over water at an atmospheric pressure of 773.1 mm Hg at 22 oC, at which the vapor pressure of water is 19.8 mm Hg.

What is the experimental value for the molar volume of the hydrogen gas in L/mol?