This question involves the concepts of molar mass and molecular formula.
The number of hydrogen atoms in 58.1 grams butane are "10".
The molecular formula of butane is C₄H₁₀. And the molar mass of butane is 58.1 grams. Molar mass id the mass of the single molecule of a compound. Hence, it is very clear from the molecular formula and molar mass of butane that 58.1 grams of butane contains 10 atoms of hydrogen. Mathematically,
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