#### Answer

Volume = 16.07 L

#### Work Step by Step

0.556 mol of gas occupy at a pressure of 715 mmHg and a temperature of 58 °C
V = ?, n = 0.556, $T =58 ^{\circ} C$, P = 715 mmHg
T = 58 + 273.15 = 331.15 K
P = 715 mmHg / 760 = 0.94 atm
using PV = nRT (where R = 0.08206)
V = 0.556 x 0.08206 x 331.15 / 0.94
= 16.07 L
P = 0.552 x 0.08206 x 305 / 8.50
= 1.63 atm
1atm = 14.7 psi
1.63 atm = 14.7 x 1.63 psi
= 23.9 psi