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  • Calculate the molecular formula of the compound which contains 20% Ca and 80% Br (by wt.) if the molecular weight of the compound is 200.<img alt="\left ( Atomic\; wt.\; Ca=40,Br=80 \righ

Calculate the molecular formula of the compound which contains 20% Ca and 80% Br (by wt.) if the molecular weight of the compound is 200.\left ( Atomic\; wt.\; Ca=40,Br=80 \right )

Option: 1

Ca_{1/2}Br


Option: 2

CaBr_{2}      


Option: 3

CaBr


Option: 4

Ca_{2}Br


Answers (1)

best_answer

Suppose, the molecular weight of the compound is 100.

then

mole of Ca =20/40=1/2
mole of Br =80/80=1
ratio between Ca and Br =1/2 or, 1:2

So the formula will be  Ca_{1/2}Br for molecular weight 100

so, for 200 molecular weights multiple by 2,

it will become Ca1Br2
so the empirical formula becomes CaBr2

Therefore, Option(2) is correct.

Posted by

Ritika Harsh

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