22.21.10 2 / 4
200%
+
(411
(b)
(c)
When molten KBr is electrolyzed, write the reaction and state the product that occurs at
the anode.
(3 marks)
A 1.2 grams of butane, C. H. (FW: 58) was burned in a bomb calorimeter causing an
increase of temperature by 5.5°C. The calorimeter constant is 11.3 kJC" Determine the
enthalpy of combustion of butane
(4 marks)
(d)
A spoon was electroplated with chromium, Cr (FW 52.0) for a period of 5.5 minutes
using a constant current of 2.2 A. Calculate the weight of chromium that will be
electroplated onto the spoon. (Given: Cr + 3e Cr E= -0.740 V)
(4 marks)
أما
Iron oxide an