## Chemistry: The Central Science (13th Edition)

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
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