What is the total number of moles of hydrogen gas contained in 9.03 × 1023 molecules?

1.5 mol.

Explanation:

Using cross multiplication:

1.0 mole of H₂ contains → 6.022 x 10²³ molecules.

??? mole of H₂ contains → 9.03 x 10²³ molecules.

∴ The no. of moles of H₂ contains (9.03 x 10²³ molecules) = (1.0 mol)(9.03 x 10²³ atoms)/(6.022 x 10²³ atoms) = 1.5 mol.

it's c (engineer's do their work with mechanical stuff not on any living being)