calculate the moles of hydrogen chloride that will be produced when 2 moles of hydrogen react completely with excess of chlorine

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Solution

Reaction of hydrogen with chlorine to give hydrogen chloride:
H₂ + Cl₂ $\to$ 2HCl

Since two mole of hydrogen are reacting, then multiplying the reaction by 2 we get,
2H₂ + 2Cl₂ $\to$ 4HCl
2 moles of hydrogen reacts with 2 moles of chlorine (excess of chlorine will be left over) to give 4 mole of HCl.
So the number of moles of hydrogen chloride produced = 4

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