Suppose the elements \( \mathrm{X} \) and \( \mathrm{Y} \) combine to form two \( \mathrm{P} \) ...
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0Suppose the elements \( \mathrm{X} \) and \( \mathrm{Y} \) combine to form two
\( \mathrm{P} \)
compounds \( \mathrm{XY}_{2} \) and \( \mathrm{X}_{3} \mathrm{Y}_{2} \). When 0.1 mole of \( \mathrm{XY}_{2} \)
W
weighs \( 10 \mathrm{~g} \) and 0.05 mole of \( X_{3} Y_{2} \) weighs \( 9 \mathrm{~g} \), the atomic weights of \( \mathrm{X} \) and \( \mathrm{Y} \) are
(A) 20,30
(B) 30,20
(C) 40,30
(D) 60,40
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