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  4. The arsenic content of an agricultural insecticide was reported as 28 % As2O5 . What is the percentage of arsenic in this preparation ?

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Q. The arsenic content of an agricultural insecticide was reported as $ 28\% $ $ As_2O_5 $ . What is the percentage of arsenic in this preparation ?

AMUAMU 2013Solutions

Solution:

There is $28\%$ $As_2O_5$ in an insecticide. It means $28\,g$
$As_2O_5$ in $100\,g$ insecticide.
Molar mass of $As_2O_5 = (2 \times 75) + (5 \times 16)=230 \,g$
$230 \,g \, As_2O_5$ contains $= 150\, g \,As$
$28 \,g \,As_2O_6$ contains
$ = \frac{150\times 28}{230}$
$ = 1826\,g \,As$
$18.26\,g\,As$ is present in $100 \,g$ insecticide so it is
$18.26\% \approx 18\%$