Answer
$33.7$ $mols$ $H$
Work Step by Step
Use a mole ratio in order to determine the number of moles of hydrogen atoms in each compound.
$1.87$ $mols$ $C_{8}H_{18}$$\times\frac{18 mols H}{1 mol C_{8}H_{18}}$ $=33.7$ $mols$ $H$
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