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a
1.57×10−24kg
b
1.66×10−24kg
c
1.99×10−23kg
d
1.66×10−27kg
answer is D.
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Detailed Solution
amu represents atomic mass unit. It is used in place of unified mass unit.1amu=11avogram =1 aston =1 dalton 1amu=112× mass =1 aston =1 dalton =1.66×10−24g=1.66×10−27kg.