Question

mass of one elctron is 9.1× 10 ^ - 31kg . calculate the mass of 5 moles of electrons
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Answer 1

Answer: 274× 10^-8  Kg

Explanation:

• mass of one electron = 9.1×10^-31 kg
• one mole electrons = 6.022×10^{23} electrons
• 5 mole electron = 5×6.022×10^23 = 30.11×10^23 electron
• mass of 5 mole electrons= 30.11×9.1×10^23-31 = 274×10^-8 kg