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An atom of an element is 40 times heavier than $1 / 12^{t h}$ of the mass of C-12 isotope. The atomic mass of the element is

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10 U

12 U

40 U

20 U

answer is C.

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Detailed Solution

An atom of an element is 40 times heavier than

\frac{1}{12} t h

of the mass of

\overset{12}{C}

isotope means calcium so its atomic mass is 40 U.

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