First slide

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

A

$A {({BC}_{3})}_{2}$
B

$A_{3} {({BC}_{4})}_{2}$
C

$A_{3} {(B_{4} C)}_{2}$
D

${ABC}_{2}$

Solution

The possible formula be A_xB_yC_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(BC₃)₂ or A₃(BC₄)₂.

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