1.

How many moles of electrons will weigh one kilogram?

Answer»

`6.023 xx 10^(23)`
`1/(9.108) xx 10^(21)`
`(6.023)/(9.108) xx 10^(54)`
`1/(9.108 xx 6.023) xx 10^(8)`

Solution :Mass of an ELECTRON `=9.108 xx 10^(-31)` kg
Mass of one MOLE of electron `=9.108 xx 10^(-31) xx 6.023 xx 10^(23) = 9.108 xx 6.023 xx 10^(-8)`
`therefore` In 1 kg, no. of moles of electrons.
`=1/(9.108 xx 6.023 xx 10^(-8)) =10^(8)/(9.108 xx 6.023)`


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