An element \( \mathrm{X} \) is found to combine with oxygen to form...

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An element \( \mathrm{X} \) is found to combine with oxygen to form \( \mathrm{X}_{4} \mathrm{O}_{6} \). If \( 8.40 \mathrm{~g} \) of this element combine with \( 6.50 \) \( g \) of oxygen, the atomic weight of the element in \( u \) is
(A) \( 24.0 \)
(B) \( 31.0 \)
(C) \( 50.4 \)
(D) \( 118.7 \)
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