Question

Determine the number of molecules of oxygen (O₂) required to complete the following chemical equation.

N₂ + O₂ → 2 NO₂

The number of molecules of oxygen (O₂) required is:

Answer 1

Given stoichiometric equation is (Balanced equation),

N2 + O2 → 2 NO2.

1 N2 + 1 O2 → 2 NO2

This stoichiometric eqution says, 1 mole of N2 reacts with 1 mole of O2 and produces 2 moles of NO2

i.e.,

To complete the above reaction, it needs 1 mole of O2 molecules

and we know that, from avogadro's number,

1 mole of substance is equal to 6.022 * 10²³ atoms/molecules

Therefore,

Amount of O2 required = 1 mole of o2 = 6.022 * 10²³ molecules of O2

Answer: 6.022*10²³ molecules of O2