kinetic model based on the assumptions that, the gas consists of molecules in ceaseless, the size of the
molecules is, and the collision between molecules is elastic collisions.
(A) straight motion, considered
(B) random motion, negligible
(C) direct line motion, medium
(D) negligible, large
10- The of gas is the ratio of its measured molar volume, to the molar volume of a perfect gas, at the same
pressure and temperature.
(A)Virial coefficients
(B) critical coefficient (C) Joule-Thomson coefficient (D) compression factor
11- Sulfur hexafluoride (SF$_6$) is a colorless, odorless, very unreactive gas. Calculate the pressure (atm) exerted by 1.82
moles of the gas in a vessel of volume 5.43L at 69.5 °C, R = 0.082 Latm/K.mol. (2marks)
Solution:
12- In an industrial process, nitrogen is heated to 800 K in a vessel of constant volume. If it enters the vessel at 250 atm
and 500 K, what pressure would it exert at the working temperature if it behaved as a perfect gas? (2marks)
Solution:
13- An inflated helium balloon with a volume of 0.95 L at sea level (1.0 atm) is allowed to rise to a height of 9.5 km,
where the pressure is about 0.70atm. Assuming that the temperature remains constant, what is the final volume of
the balloon? (2marks)
Solution:
14- In the reaction 2H$_2$(g) + O$_2$(g) → 2H$_2$O(l), If 3 mol of gas-phase molecules is replaced by 2 mol of liquid-phase
molecules, so Δng = -3 mol at 298 K, R = 8.314 J/k.mol. Calculate the difference between the enthalpy and
internal energy changes. (2marks)
Solution:
15- If we pass a current of 9.0 A from a 15.0 V supply for 280.0 s, estimate the energy supplied as heat? (2marks)
Solution:
