Final answer:
To find the pressure of the gas, we can use the ideal gas law equation: PV = nRT. Plugging in the given values, we can calculate the pressure to be approximately 111.34 atm.
Step-by-step explanation:
To find the pressure of the gas, we can use the ideal gas law equation: PV = nRT. In this equation, P represents pressure, V represents volume, n represents the number of moles of gas, R is the ideal gas constant, and T is the temperature in Kelvin.
Given: n = 21.5 mol, V = 66.5 L, and T = 429 K.
Plugging in these values, we can solve for P:
P = (nRT) / V = (21.5 mol)(0.0821 L·atm/mol·K)(429 K) / 66.5 L ≈ 111.34 atm
Therefore, the pressure of the gas is approximately 111.34 atm.