Q.

The mass of one helium atom is ____?

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a

66.4×10-27 kg

b

66.4×10-27gm

c

6.64×10-27 kg

d

6.64×10-27gm

answer is C.

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Detailed Solution

Atomic mass of an element = A×u=4×1.6×10-27kg=6.64×10-27 kg
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