Final answer:
There are 3.011 × 1024 hydrogen atoms in 2.50 mol of hydrogen, calculated by multiplying the number of moles by Avogadro's number and then by two for the diatomic nature of hydrogen.
Step-by-step explanation:
To determine how many atoms are in 2.50 mol of hydrogen, we need to use Avogadro's number, which is 6.022 × 1023 atoms per mole. Since molecular hydrogen (H2) is diatomic, meaning each molecule has two hydrogen atoms, we multiply the moles given by Avogadro's number and then by two.
Number of atoms = 2.50 mol × 6.022 × 1023 atoms/mol × 2 atoms/molecule = 3.011 × 1024 atoms of hydrogen.