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Q.

A 0.50 g sample containing only anhydrous FeCl3 ( molar mass: 162.5gmol1) and AlCl3 (molar mass: 133.5 g mol1 yielded 1.435g of  AgCl (molar mass: 143.5gmol1).  The mass of FeCl3 in the sample is

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a

0.3126 g

b

0.4157 g

c

0.2345 g

d

0.1567 g

answer is A.

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Detailed Solution

Amount of AgCl obtained, n=mM=1.435g143.5gmol1=0.01mol

Let x be the mass of FeCl3, then

Amount of FeCl3 =x162gmol1 and  Amount of AlCl3=0.50gx133.5gmol1

Hence,  3x162gmol1+0.50gx133.5gmol1=0.01mol

Solving for x, we get

x=1(28.5)0.01×162×133.5381g=0.3126g

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A 0.50 g sample containing only anhydrous FeCl3 ( molar mass: 162.5gmol−1) and AlCl3 (molar mass: 133.5 g mol−1 yielded 1.435g of  AgCl (molar mass: 143.5gmol−1).  The mass of FeCl3 in the sample is