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Using the ideal gas law (PV = nRT), we can calculate the pressure (P) inside the container.
P = (n * R * T) / V
where:
n = number of moles of gas (3 moles)
R = ideal gas constant (0.0821 Latm/(molK))
T = temperature in Kelvin (400 K)
V = volume of the container (60 L)
Plugging in the values:
P = (3 moles * 0.0821 Latm/(molK) * 400 K) / 60 L
P = 1.642 atm
Therefore, the pressure inside the container is 1.642 atm.