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If an element X is present 70% by weight in its oxide X2O3, then atomic mass of element X is |
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Answer» ercentage of X in X2O3 = 70 %To Find:The ATOMIC MASS of element X.Calculation:- % of Oxygen = 100 - 70 = 30%- Let the mass of X₂O₃ be 'm'- Mass of oxygen in given X₂O₃ = 3 x 16 = 48 GRAMS⇒ 30% of m = 48⇒ 30 m/100 = 48⇒ m = 160 gram⇒ The molar mass of X₂O₃ is 160 grams.- Hence, the mass of 2 'X' atoms = 160 - 48 = 112- Atomic Mass of 'X' = 112/2 ⇒ Atomic Mass of 'X' = 56 gram- Thus, the Atomic mass of Element 'X' is 56 gram. |
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