The formula of an acid is HXO2. The mass of 0.0242 moles of the acid is 1.657 g. What is the atomic weight of X ?

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35.5

28.1

128

19.0

answer is A.

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Detailed Solution

Molar mass of HXO2 = 1.6570.0242 = 68.47Molar mass = 68.47 = 1+At.wt of X +2(16)At.wt of X = 35.47 ≅ 35.5

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