'X' is the amount of a substance that contains as many particles as there are atoms in exactly 12 g of the Y isotope. X and Y respectively are

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$A \to one mole, B \to {}^{14}C$

$A \to percentage composition, B \to {}^{12}C$

$A \to one mole, B \to {}^{12}C$

$A \to percentage composition, B \to {}^{14}C$

answer is C.

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Detailed Solution

One mole is the amount of a substance that contains as many particles or entities as there are atoms in exactly 12 g(0.012kg) of the ${}^{12}C$ isotope.

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