Answer:
4.811 atm.
Explanation:
where, P is the pressure of the gas in atm (P = ?? atm).
V is the volume of the gas in L (V = 2.5 L).
n is the no. of moles of the gas in mol (n = 0.5 mol).
R is the general gas constant (R = 0.0821 L.atm/mol.K),
T is the temperature of the gas in K (T = 20°C + 273 = 293 K).
∴ P = nRT/V = (0.5 mol)(0.0821 L.atm/mol.K)(293 K)/(2.5 L) = 4.811 atm.