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Answer :

[tex]▪▪▪▪▪▪▪▪▪▪▪▪▪  {\huge\mathfrak{Answer}}▪▪▪▪▪▪▪▪▪▪▪▪▪▪[/tex]

In the equation, coefficients are molar ratios, so we can conclude that :

For the given reaction to proceed smoothly, we need 3 moles of H2 molecule ~