Q83E
Question
A sample of gallium bromide, GaBr2, weighing 0.165 g was dissolved in water and treated with silver nitrate, AgNO3, resulting in the precipitation of 0.299 g AgBr. Use these data to compute the %Ga (by mass) GaBr2.
Step-by-Step Solution
Verified Answer
The required % Ga = 22.4 %
1Determine balanced equation
Balanced equation is as follows
GaBr3 + 3 Ag NO3 → 3 AgBr + Ga (NO3)3
% Ga = g Ga/ g GaBr3 x 100
= x / 0.165 g GaBr3
2Determine the required percentage
0.299 g AgBr x 1 mol Ag Br x 1mol GaBr3 x mol of Ga x 69.72 g of Ga
187.3 g AgBr 3 mol AgBr 1 mol GaBr3 1mol of Ga
= 0.0370 g of Ga
% Ga = (g Ga/ g GaBr3) x 100
= (0.0370 / 0.165 g GaBr3) x 100
= 22.4 %
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