Elimination Method of Finding Solution of a Pair of Linear Equations
Suppose the e...
Question
Suppose the elements X and Y combine to form two compounds XY2 and X3Y2. When 0.1 mole of XY2 weighs 10 g and 0.05 mole of X3Y2. weighs 9 g, the atomic weights of X and Y are
A
40, 30
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B
60, 40
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C
20, 30
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D
30, 20
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Solution
The correct option is A 40, 30 We can use mass and mole balance to solve this. 0.1x+(0.1)(2)y=10 (0.05)(3)x+(0.05)(2)y=9 Solve these two equations and you get x = 40, y = 30.