1.) A sample of a substance with the empirical formula XBr2 weighs 0.5957 g. Whe

Question

1.) A sample of a substance with the empirical formula XBr2 weighs 0.5957 g. When it is dissolved in water and all its bromine is converted to insoluble AgBr by addition of an excess of silver nitrate, the mass of the resulting AgBr is found to be 0.7530 g. The chemical reaction is XBr2 + 2 AgNO32AgBr + X(NO3)2 (a) Calculate the formula mass of XBr2.

Formula mass XBr2 = ____g mol-1

(b) Calculate the atomic mass of X. Atomic mass X = _____g mol-1

2.)A 0.4296 g sample of a pure soluble bromide compound is dissolved in water, and all of the bromide ion is precipitated as AgBr by the addition of an excess of silver nitrate. The mass of the resulting AgBr is found to be 0.9076 g.

What is the mass percentage of bromine in the original compound? ______%

Explanation / Answer

percent of Br = (atomic mass bromine / molar mass of AgBr) X compound mass formed/ mass of organic compoun)X 100

= (80/188) x(0.9076/0.4296) x 100

percent of Br =89.91

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