calculate number of electrons in 142 gram cl2 gas
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molecular mass cl2 = 35.5*2= 71
given mass = 142
no of moles = 142
71
no of moles = 2
no of electron in cl2 = 34
no of electron in 2 moles cl2 =34*2*6.02*10^23
= 68*6.02*10^23
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