Chemical equations and calculations

Question

A compound contains atoms of three elements A, B, and C. If If the oxidation number of A is +2, B is +5, and C is-2, the possible formula of the compound is:

Moderate

Solution

The possible formula be A_{x}B_{y}C_{z} .

As compound is neutral, so x(+2) + y(+5) + z(-2) = 0

$\Rightarrow $2x + 5y - 2z = 0

By hit and trial, we get: x = 1, y = 2, z = 6 and x = 3, y = 2, z = 8.

So compound is A(BC_{3})_{2} or A_{3}(BC_{4})_{2}.

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