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What is the atomic mass of lithium if 7.42% of its atoms have the mass of 6.02amu and 92.58% of its atoms have the mass of 7.02amu?

1 Answer

Trevor Ryan. · Meave60

Dec 28, 2015

$6.9458 amu$ $"6.9458 amu"$

Explanation:

Consider 10000 atoms of $Li$ $"Li"$ .

$742$ $742$ of them would have mass $6.02$ $6.02$ .
$9258$ $9258$ of them would have mass $7.02$ $7.02$ .

Hence the total mass of these $10000 Li$ $"10000 Li"$ atoms would be

$(742 \times 6.02) + (9258 \times 7.02) = 69458$ $(742xx6.02)+(9258xx7.02)=69458$

$therefore$ $"1 Li"$ atom on average would have mass of $69458/10000="6.9458 amu"$ .

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