Answer: 8.804 × 10⁻¹² moles
Step-by-step explanation:
The number of particles in a substance can be calculated by multiplying the number of moles of the substance by Avogadro's Number ~ 6.02 × 10²³ particles/mol. Therefore to find the number of moles based on the number of particles, you would divide the number of moles by Avogadro's Number.
Since # of particles of H₂O = 5.3×10¹² particles
then # of moles of H₂O = 5.3×10¹² particles ÷ 6.02 × 10²³ particles/mol
= 8.804 × 10⁻¹² moles