Question

omeone answer all the wuestions

: 24.11 Equal masses of He and Ne are placed in a sealed container. What is the partial pressure of He if the sotal pressure in the (E) 5 atm (A) 1 atm (B) 2 atms (C) 3 atm 2.A pure liquid in an open vessel boils at the temperature at which the (A) molar entropy of the liquid becomes equal to that of the gas vapor pressure of the liquid becomes equal to the oquilibrium pressurc af the triple point the surface of the liquid vapor pressure of the liquid becomes equal to the atmospheric pressure on molar heat capacity of the liquid becomes equal to that of the gas average kinetic energy of the liquid molecules become ) (E) s equal to that of the gas molecules 3. Under which of the following conditions of temperature and pressure an ideal gas? would 1.0 mol of the real gas Co4g) behave most like Temperature (K) Pressure(atm) (A) 100 (B) 100 (C) 800 (D) S00 (E) 800 0.1 compound ethylene glycol, C,H.O, forms nearly ideal solutions with water. What is the vapor pressure of a water at the same temperature is The nonvolatile solution made from 1.00 mol of C,H.0, and 9.00 moles of H,O if the vapor pressure of pure 25.0 mm Hg? (A) (D) 2.50 mm Hg 22.5 mm Hg (C) 125 mim Hg (B) (E) 7.50 mm Hg 27.5 mm Hg 2 X(g)+ Y(g) 3Z(g) In a laboralory experiment, Hig) is collected over water in a gas-collection tube as shown in the diagram above. The temperature of the water is 21 "C a measuring the volume of the gas collected in the tube, what step, if any, must be taken to make it possib total gas pressure inside the tube? and the atmospheric pressure in the laboratory is determined to be 772 torr. Before le to determine the (A) tt the tube to the side enough to let some air in to break the partial vacuum in the tube (B) lit the tube upward until it is just barely immersed in the water (C) move the tube downward until the water level is the same inside and outside the tube (D) Adjust the temperature of the water to 25 C (E) No further steps need to be taken as long as the temperature of the water is known 6. At standard temperature and pressure, a 0.50 mol sample of H, gas and a separate I.0 mol sample of O, gas have the same (A) average molecular kinetic energy (B) (D) average molecular speed effusion rate volume E) density Questions 7-9 refer to the following gases at 0 "C and 1 atm (C) 0 (D) CO (E) NO (A) Ne 7. Has an average atomic or molecular speed closest to that of N, molecules at 0 C and 1 atm. 8. Has the greatest density 9 Has the greatest rate of effusion through a pinhole. (B) Xe

Answer 1

1. Let the mass of both be m

Then moles of He = m/ 4

Moles of Ne = m/ 20

mole fraction of He = Moles of He/ Total moles = m/4/ (m/4 + m/20) = 0.25 m/0.3m = 0.83

Pressure of He = Mole fraction * total pressure = 0.83 * 6 atm = 5 atm option E

2. Boiling point is the temperature at which pressure of solution becomes equal to atmospheric pressure.

option C

3. Real gases behaves ideally at low pressure and high temperature

So, option C

4. Mole fraction of water = 9 / 9+1 = 9/10 = 0.9

Pressure of water = 0.9 * 25 = 22.5 mm Hg

option D

5. diagram not given

6. Average kinetic energy = 3/2 kT

i.e. depend only on Temperature. But all other quantities depends on mass as well which is different for both. So, option A

Molar mass of Ne = 20,

Mass of Xe = 131.3, Mass of CO = 28, Mass of NO = 30 and mass of O₂ = 32

7. Average molecular speed is inversely proportional to M^1/2

So, Molecules with same molecular mass have same speed.

Molecular mass of N₂ = 28

and mass of CO = 12 + 16 = 28

So, answer is CO, option C

8. density is directly proportional to mass. More is the mass, More is the density.

And here Mass of Xe is higher

So, Xe has higher density

option B9. Rate of effusion is inversely proportional to molar mass. Smaller is the mass, More is the rate of effusion.

option (A)