alleryApproximately how many electrons are present in a charge of −1 C?
A6 × 10²³ electrons
B6 × 10¹² electrons
C6 × 10¹⁵ electrons
D6 × 10¹⁸ electrons
Answer & Solution
Correct answer: D. 6 × 10¹⁸ electrons
n = q/e = 1 / (1.6×10⁻¹⁹) ≈ 6.25 × 10¹⁸ electrons.
6×10²³ is Avogadro's number — relevant to moles, not single coulombs.
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