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The pressure of the H2S gas can be calculated using the ideal gas equation: PV = nRT, where P is the pressure, V is the volume, n is the number of moles, R is the ideal gas constant (0.0821 L·atm/mol·K), and T is the temperature in Kelvin.
Plugging in the given values:
P = (2.80 mol
0.0821 L·atm/mol·K
481 K) / 4.20 L = 26.5 atm
Therefore, the pressure of the H2S gas is 26.5 atm.