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Question

Certain non-metal X forms two oxides I and II. The mass percentage of oxygen in I(X4O6) is 43.7 which is same as that X in the 2nd oxide. Find the formula of 2nd oxide.

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Solution

Mass percentage of X in oxide 2 =43.7

Mass percentage of oxygen in oxide 2 =56.3

Hence atoms of oxygen =643.7×56.3=7.73

Atoms of X=456.3×43.7=3.1

Therefore, ratio of oxygen to X =7.733.1=52

Formula=X2O5

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