3
The ratio of
weights of an element X and oxygen in
the oxide of the element is 9:8. The formula of the
oxide is X2O3. The atomic weight of X is
(a) 27
(b) 24
(C) 16
(d) 13.5
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Answer:
14 g of an element X combines with 16 g of oxygen, then the element X could have an atomic weight of 7 amu and its oxide is X 2 moles.
16 g of oxygen corresponds to 1 mole.
The formula X
When the atomic weight is 7, 14 g will corresponds to 2 moles.
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