When the pressure over a liquid is decreased, the boiling point of the liquid wi

Question

When the pressure over a liquid is decreased, the boiling point of the liquid wiU always decrease always increase increase or decrease Which statement is not correct? A volatile liquid has a high boiling point The boiling point of a liquid Is the temperature at which its vapor pressure is equal to the external pressure The stronger the intermolecular forces, the higher the boiling point. The equilibrium vapor pressure above a liquid is independent of the volume of liquid present and the volume of vapor present The vapor pressure above a liquid increases with temperature. Benzene, C_6 H_4 has a boiling point of 80 degree C The density of benzene vapor in equilibrium with liquid benzene at 50 degree C is 1 153 g/L. What is the vapor pressure of benzene in mm Hg at 50 degree C? 298 50 352 462 0 392 Glauber's salt, NaSO

Explanation / Answer

1) Always decrease.Release of pressure, decreases the B.P.

2) The incorrect statement is :-

a) A volatile liquid has high B.P

5) At triple point of water, all three phases i.e solid,liquid and gas are present.

4) Moles of the salt in 1 kg of it = mass/molar mass = 1000/322.19 = 3.104

Thus, eenergy stored = moles*delta Hf = 3.104*80.93 = 251.2 kJ

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