The molar mass of hydrogen is

Explanation

The molar mass of hydrogen (H) is the mass of one mole of hydrogen atoms. Since 1 mole of hydrogen contains 6.022 × 10²³ atoms (Avogadro’s number), the molar mass of hydrogen is approximately 1.008 grams per mole. The other options either refer to atomic mass units (amu) or quantities unrelated to molar mass.

To determine the molar mass of hydrogen gas (H₂), you multiply the atomic mass of a single hydrogen atom (1.00784 atomic mass units) by 2. Since hydrogen gas consists of two hydrogen atoms bonded together, the calculation is straightforward:

1.00784 × 2 = 2.01568 grams per mole.

Final Answer

The correct answer is 1.008 g.