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 .

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  • 1 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

  • Anonymous
    1 month ago

    move to homework help. CHEATER.

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