Mass of dish and anhydrous BaCl 2 (after 3rd heating)
= 24.70 g- The purpose of cooling the anhydrous BaCl 2 in the desiccator is to
(A) protect the experimenter from the heat of the dish
(B) cool the dish slowly
(C) keep the contents of the dish from rehydrating
(D) cool the dish quickly
(E) rehydrate the contents of the dish
If the person running the experiment failed to notice a small amount of the
solid substance jump out of the evaporating dish during heating, the resulting
data would suggest the amount of water in the hydrate is
(A) less than what it should be
(B) the same as if nothing jumped out of the dish
(C) more than what it should be
(D) equal to the mass of the BaCl 2 that also left the dish
(E) more than the mass of the BaCl 2 that also left the dish
The number of moles of water released from the hydrated barium chloride
after three rounds of heating is
(A) 0.0200 mol
(B) 0.0400 mol
(C) 0.0800 mol
(D) 0.100 mol
(E) 1.20 mol
51. What is the mass, in grams, of 1 mole of KAl(SO 4 ) 2 · 12H 2 O?
(A) 132
(B) 180
(C) 394
(D) 474
(E) 516
- What mass of aluminum will be completely oxidized by 2 moles of oxygen at
STP?
(A) 18 g
(B) 37.8 g
(C) 50.4 g
(D) 72.0 g
(E) 100.8 g