Answer
The mass of an Avagadro's number of people, if the average mass of a person is 160lb is:
$9.63 X 10^25$ pounds
or
$4.369 X 10^25$ kilograms
The mass of the earth is 1.611E25 Kg heavier than 1 mol of people
Work Step by Step
Key things to know:
Avogadro's number $6.02 X 10^{23}$
1 pound = 0.4536 kilograms
How To solve:
6.02E23 people X 160lbs
=$9.63 X 10^{25}$ pounds
$9.63 X 10^{25}$ pounds X (.4536kg/1 Lb)
=$4.369 X 10^{25}$ kilograms
note, pounds cancel out and you're left with kilograms
5.98E25 - 4.369E25 kilograms = 1.611E25 Kg
