Chemistry How Many Moles of Electrons Weigh 1 kg?

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To determine how many moles of electrons weigh 1 kg, the mass of an electron (9.1 x 10^-31 kg) is used to calculate the total number of electrons in 1 kg, which is found by dividing 1 kg by the mass of an electron. This total is then divided by Avogadro's number (6 x 10^23) to find the number of moles. There was a discussion about whether it was necessary to convert the mass into grams for the calculation, but it was clarified that using kilograms is acceptable since the mass of the electron is already in that unit. The importance of including units in calculations was also emphasized for clarity. Accurate unit usage is crucial for ensuring correctness in scientific calculations.
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Homework Statement


How many moles of electrons weigh 1 kg?

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The Attempt at a Solution


We know the mass of an electron= 9.1*10-31kg. So no of electrons in one Kg will be 1/9.1*10-31. Then we just divide that by 6* 1023 to get the number of moles. But my teacher told me that i need to first convert the mass into grams for the calculations. Does it matter in this case since we're dealing with electrons?
 
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As the mass of electron is already expressed in kg, there is no need to convert it and your approach is perfectly correct. However in future please don't omit units - I had to check 9.1×10-31 is a mass of an electron expressed in kg to be sure you are right.
 
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Borek said:
As the mass of electron is already expressed in kg, there is no need to convert it and your approach is perfectly correct. However in future please don't omit units - I had to check 9.1×10-31 is a mass of an electron expressed in kg to be sure you are right.
sorry about that. And thank you sir.
 

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