# A sample of indium chloride, #"InCl"_3#, is known to be contaminated with sodium chloride, NaCl. The contaminated sample is then treated with excess #"AgNO"_3#(aq). What is the percentage by mass of #"InCl"_3# in the sample?

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A sample of indium chloride, #"InCl"_3# , is known to be contaminated with sodium chloride, NaCl. The contaminated sample weighs 2.55 g. When the contaminated sample is treated with excess #"AgNO"_3# (aq), 5.16 grams of AgCl(s) are obtained. What is the percentage by mass of #"InCl"_3# in the sample?

A sample of indium chloride,

##### 1 Answer

Purity of

#### Explanation:

First, write down chemical equation and see what happens:

Atomic weights for

Then calculate the molar mass(g/mol).

Now let

Consider the weight of sample:

Consider the weight of

Solve the simultaneous equation and you will find:

The amount of