Q.

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

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a

10 amu

b

2.3 amu

c

35.5 amu

d

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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