MHT CET Chemistry question

How many moles of electrons weigh one kilogram?

Answer: (D)

Solution

Mass of an electron = 9.108 × 10⁻³¹ kg, so electrons in 1 kg = 10³¹/9.108 and moles = (10³¹/9.108)/(6.023 × 10²³) = [1/(9.108 × 6.023)]

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Question ID VK-041300