Answer
$107.5\ g$
Work Step by Step
Percent yield:
$37\%=15\ g/T.Y. \times 100\%$
$T.Y.= 40.54\ g$
Number of moles of hydrogen:
$40.54\ g/2.016\ g/mol=20.11\ mol$
From stoichiometry:
$20.11\ mol\times 1_{CH_4}/3_{H_2}\times 16.04\ g/mol=107.5\ g$