Page 363 - SUBSEC October 2017_Neat

- 4 -

11. A mass of 25 g of an unknown gas, X, is Items 13 and 14 refers to the following
pumped through an industrial pipeline of options.
volume 60 m at a pressure of 120 kPa
3
and temperature of 150 C. (Molar (A) Enthalpy of formation
o
gas constant = 8.31 J K mol .) (B) Lattice energy
-1
-1
(C) Enthalpy of solution
What is the relative molecular mass of the (D) Enthalpy of hydration
gas?
Match EACH item below with one of the
(A) 1.2 × 10 -2 options above, each of which may be used
(B) 4.3 × 10 -2 once, more than once or not at all.
(C) 4.3
(D) 12.2 13. Y (s) + O (g) → YO (g)
2
2

12. The melting points and boiling points of 14. XY (s) + water → XY (aq)
two pure substances, X and Y, are given
below:

Melting point/K Boiling point/K

X 273 373
Y 317 400

Which of the following statements about X
and Y are correct?

I. At 298 K, the particles of X can occupy
the volume of its container.
II. At 298 K, the particles of Y are in fixed
positions.
III. At 380 K, the particles of X have more
energy than the particles of Y.

(A) I and II only
(B) I and III only
(C) II and III only
(D) I, II and III

GO ON TO THE NEXT PAGE
02112010/CAPE/SPEC/2017