Question

$Ag_3X \to 3Ag + X$ $20\, g$ of a silver salt of a substance produced $10.8\, g$ of pure silver upon strong heating. Atomic mass of X is (At. wt. of $Ag$ is $108\, u$)

• A. $324$
• B. $224$
• C. $276$
• D. $374$

Answer 1

Answer: (C)

$276$

Answer 2

$Ag_3X \to 3Ag + X$ $10.8\, g$ of $Ag$ is produced by $= 20g$ $3 \times 108\, g\, Ag$ is produced by $= \frac{20}{10.8} \times3\times 108 = 600g$ Molecular weight of $Ag_{3}X = 600$ So, $3 \times 108 + X= 600$ and $X= 276$.