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Q.

A compound made of two elements A and B is found to contain 25% A (at mass 12.5) and 75% B (at mass 37.5). The empirical formula of the compound is:

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a

AB3

b

AB

c

AB2

d

A3B

answer is A.

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Detailed Solution

Element    %   At. mass   %At. mass     Simple
                                                                       ratio

A             25    12.5      25/12.5 = 2       1
   B           75    37.5      75/37.5 = 2       1
⸫ The empirical formula of the compound is AB.

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A compound made of two elements A and B is found to contain 25% A (at mass 12.5) and 75% B (at mass 37.5). The empirical formula of the compound is: