The total number of electrons per He molecule is equal to 2.
The number of moles in 1.0 kg of the helium sample is equal to
The number of molecules of He in sample is equal to
250×6.02×1023=1.5×1025
The number of electrons in 1 kg of the helium sample is equal to
2×1.5×1025=3×1025
The total charge of those electrons is
3×1025×(-1.6×10-19)=-4.8×10-6 C
Answer
-4.8×10-6 C
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