Final answer:
To determine the number of atoms of oxygen in 0.400 moles of N205, multiply the number of moles of N205 by the molar ratio of oxygen to N205. Then, use Avogadro's number to convert moles to atoms.
No. of oxygen atoms in 0.400 moles of N2O5 = 4.8184 x 10²³ atoms.
Step-by-step explanation:
To determine the number of atoms of oxygen in 0.400 moles of N205, we need to use the molar ratio between N205 and oxygen. The chemical formula of N205 indicates that it contains 2 moles of oxygen per 1 mole of N205. Therefore, the number of moles of oxygen in 0.400 moles of N205 would be 2 x 0.400 = 0.800 moles.
However, to convert moles to atoms, we need to use Avogadro's number, which states that 1 mole of any substance contains 6.022 x 10²³ particles. Therefore, the number of atoms of oxygen in 0.400 moles of N205 can be calculated as 0.800 moles x 6.022 x 10²³ atoms/mole = 4.8184 x 10²³ atoms.