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Some Basic Concepts Of Chemistry

Question
CBSEENCH11004930

Two elements A (At. wt. 75) and B (At. wt. 16) combine to give a compound having 75·8%A. Calculate the relative number of atoms present in B.

Solution

As, we have given the relative number of A =75.8%
open square brackets Percentage space of space straight A space equals space 75.8 close square brackets.
therefore space space space space Percentage space of space straight B space equals space 100 minus space 75.8 space space equals space 24.2
Relative space number space of space atoms space in space straight B
space space space space space space equals space fraction numerator percent sign space age space composition over denominator Atomic space mass end fraction space equals space fraction numerator 24.2 over denominator 16 end fraction space equals space 1.5
Hence, the relative number of B = 1.5%