Answer:
74.3 g/mol
Explanation:
PV=nRT
P=745 mmHg: (change mmHg to atm) 745/760 = 0.9803atm
v = 0.35 L
T = 370 K
rearrange the formula above: n = [tex]\frac{PV}{RT}[/tex]
plug in the info: [tex]\frac{(0.9803 atm)(0.35 L)}{(0.08206\frac{atm*L}{mol*K}) (370K)}[/tex] = 0.01130 mol
then take the mass / mole = [tex]\frac{0.8394g}{0.01130mol}[/tex] = 74.3 g/mol
