Calculate the molar mass of the unknown gas.?
The mass of an evacuated 260 mL flask is 143.207 g . The mass of the flask filled with 276 torr of an unknown gas at 35 ∘C is 144.207 g .
- hcbiochemLv 71 month ago
Use the ideal gas law to calculate the moles of gas in the flask:
PV = n RT
P = 276 torr/760 torr/atm = 0.363 atm
T = 35 + 273 = 308 K
0.363 atm (0.260 L) = n (0.08206 Latm/molK) (308 K)
n = 3.74X10^-3 mol gas
Molar mass = 1.000 g / 3.74X10^-3 mol = 268 g/mol
- Anonymous1 month ago
move to homework help. CHEATER.