3.011x1022 atoms of an element weight 1.158 gm.The atomic mass of the element is:

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10 amu

2.3 amu

35.5 amu

23 amu

answer is D.

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Detailed Solution

Moles of atoms =3.011×10226.02×1023=120Atomic mass =massmoles=1.151/20=23

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