InterviewSolution
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InterviewSolution
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Suppose elements `X` and `Y` combine to form two compounds `XY_(2)` and `X_(3)Y_(2)` when 0.1 mole of former weigh `10 g` while 0.05 mole of the latter weigh `9g`. What are the atomic weights of `X` and `Y`.A. 40, 30B. 60, 40C. 20, 30D. 30, 20 |
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Answer» Correct Answer - A `XY_(2)` 0.1 mole weight=10g `therefore1` mole weight=?=100 g mol wt `X_(3)Y_(2)` 0.05 mole weight=9g `therefore1` mole weight=?=`(9)/(0.05)=180g` mol. Wt `thereforeFor` `XY_(2)` `a+2b=100` . . . (1) For `X_(3)Y_(2)` `3a+2b=180` . . . (2) equation (2)-(1) 2a=80 a=40 and b=30 |
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