The total number of moles of NaOH needed to react : 4
Given
Reaction
2NaOH + H2SO4 → Na2SO4 + 2H2O
Required
moles of NaOH
Solution
The chemical reaction coefficient shows the mole ratio of the components of the compounds involved in the reaction, either in terms of reactants or products
From the equation, mol ratio of NaOH and H2SO4 : = 2 : 1, so mol NaOH :
= 2/1 x mol H2SO4
= 2/1 x 2 moles
= 4 moles
4 moles of sodium hydroxide is needed to react completely with 2 moles of sulfuric acid.
Moles of any substance gives idea about the amount of that substance and in 1 mole of substance 6.022×10²³ atoms of that substance.
Given chemical reaction is:
2NaOH + H₂SO₄ → Na₂SO₄ + 2H₂O
From the stoichiometry of the reaction, it is clear that:
1 moles of H₂SO₄ = react with 2 moles of NaOH
2 moles of H₂SO₄ = react with 2×2=4 moles of NaOH
Hence, option (3) is correct i.e. 4 moles of NaOH is needed.
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