An atom of an element 'X' is 1.02 times heavier than that of an atom of 'Y'. An atom of 'Y' is 0.1809 times heavier than that of an atom of oxygen. The atomic mass of 'X' is :

2.952

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5.314

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4.4

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2.6

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Solution

The correct option is A 2.952
An atom of 'Y' is 0.1809 times heavier than that of an atom of oxygen.
The weight of 1 mole atom of oxygen is $16$ g.
Weight of 1 mole atom of Y $= 0.1809 \times 16 = 2.8944$ g.
An atom of element 'X' is 1.02 times heavier than that of an atom of 'Y'.
Weight of 1 mole atom of X $= 1.02 \times 2.8944 = 2.952$ g.

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