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The ideal gas equation is PV = nRT, where P is pressure, V is volume, n is the number of moles, R is the ideal gas constant (0.0821 L·atm/mol·K), and T is temperature in Kelvin. Solving for P, we get: P = (nRT)/V = (3.20 mol
0.0821 L·atm/mol·K
481 K) / 4.50 L = 28.6 atm