Answer:
"The elements are arranged in seven horizontal rows,called periods or series,and 18 vertical columns,called Groups."
Explanation:
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The total number of moles of NaOH needed to react : 4
<h3>Further explanation</h3>
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