Final answer:
A 1.007-g sample of hydrogen-1 contains approximately 6.022 × 10¹¹³ atoms, based on the mass of one mole of hydrogen atoms being 1.0079 g and the relationship to Avogadro's number.
Step-by-step explanation:
The question asks us to determine the number of atoms of hydrogen-1 in a 1.007-g sample. To answer this, we first consider that the mass of 1 mole of hydrogen atoms is 1.0079 g. Therefore, a 1.007-g sample is very close to 1 mole because their masses are almost identical. Avogadro's number informs us that 1 mole contains 6.022 × 10²³ atoms.
As such, a 1.007-g sample of hydrogen-1 will contain approximately 6.022 × 10²³ hydrogen atoms. It is important to recognize that the mass given is for hydrogen-1, which means we are considering the most common isotope of hydrogen that has an atomic mass close to 1 u.