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Answer is: 27.9 mol

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The number of moles in 625 L of H₂ gas at STP is 27.88 moles

From the ideal gas equation, we have that

PV = nRT

∴ [tex]n =\frac{PV}{RT}[/tex]

Where n is the number of moles

P is the pressure

V is volume

R is the gas constant

and T is the temperature

From the question,

Volume of H₂ gas = 625 L

At STP

P = 1 atm

and T = 273.15 K

Putting the parameters into the equation, we get

[tex]n = \frac{1\times 625}{0.08206\times 273.15}[/tex]

n = 27.88 moles

Hence, the number of moles in 625 L of H₂ gas at STP is 27.88 moles

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