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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