A sample of an unknown volatile liquid was injected into a Dumas flask (mass of flask=

Chemistry

1 answer:

denis23 [38]2 years ago

8 0

Answer:

Ethyl acetate.

Explanation:

We can use the general law of ideal gas: PV = nRT.

where, P is the pressure of the gas in atm (P = 0.976 atm).

V is the volume of the gas in L (V = volume of the flask = 0.1040 L).

n is the no. of moles of the gas in mol (n = ??? mol).

R is the general gas constant (R = 0.0821 L.atm/mol.K),

T is the temperature of the gas in K (T = 18.0°C + 273 = 291 K).

∴ n = PV/RT = (0.976 atm)(0.1040 L)/(0.0821 L.atm/mol.K)(291 K) = 4.25 x 10⁻³ mol.

∵ n = mass/molar mass,

mass of the volatile liquid = (mass of flask + vapor) - (mass of flask) = 27.4593 g - 27.0928 g = 0.3665 g.

∴ Molar mass of the volatile liquid = (mass)/(n) = (0.3665 g)/(4.25 x 10⁻³ mol) = 86.235 g/mol.

The volatile liquid may be ethyl acetate which has a molar mass of (88.11 g/mol).

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