(A) 2.0 × 10−6
(B) 2.0 × 10−3
(C) 1.0 × 10−2
(D) 1.3 × 10−2
(E) 1.6 × 10−2
63 .
A sample of methanol is placed in a sealed container, heated to 210ºC, and allowed to
establish equilibrium according to the equation above. The vessel is then heated, at
constant pressure, to 250ºC. Which of the following will happen when the vessel is heated?(A) The value of the equilibrium constant will increase.
(B) The value of the equilibrium constant will decrease.
(C) The reaction will produce more moles of CH 3 OH (g).
The system will relieve the stress by shifting toward the side with fewer moles of
gaseous reaction species.(D)
As long as the pressure is constant, the equilibrium need not shift, and the relative
amounts of reactants and products stay the same.(E)
64 . In the laboratory a student was determining the formula for the hydrate of barium
chloride, BaCl 2 . The student cleaned, dried, and determined the mass of the crucible and
cover. The student then added a sample of the hydrate to the crucible and determined
the mass. The student heated the sample in the crucible strongly for 10 minutes. The
sample in the crucible and cover was cooled and the mass was determined. The mass data
is provided in the table below:
Mass of crucible and cover 31.623 grams
Mass of crucible, cover, and sample prior to heating 33.632 grams
Mass of crucible, cover, and sample after heating 33.376 gramsAfter the heating, how many moles of water were removed from the sample?