In the reaction 4Li (s) + O 2 (g) → 2 Li 2 O (s) what is the coefficient of the lithium metal?

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Explanation: 

The coefficient is the number that is present before the formula of the compound or molecule in the balanced equation we use coefficients to balance the each atom both sides of the chemical equation .

In the reaction given above the number that exists before Li Lithium metal is 4 so, its coefficent is 4 .

Answer: 

4

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