Respuesta :

N2 + 2O2 → 2NO2
The number to be placed before O2 is 2

Answer:

Number  '2' should be placed in the blank before oxygen.

Explanation:

[tex]N_2 + O_2\rightarrow 2NO_2[/tex]

Stoichiometric coefficient is the number mentioned in front of the chemical substances in balanced chemical reaction.

[tex]N_2 + 2O_2\rightarrow 2NO_2[/tex]

According to stoichiometry, 1 mole of nitrogen gas reacts with 2 moles of oxygen gas to give 2 moles of nitrogen dioxide.

Stoichiometric coefficient of nitrogen gas = 1

Stoichiometric coefficient of oxygen gas = 2

Stoichiometric coefficient of nitrogen dioxide gas = 2

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