What would be the total weight, in kilograms, of exactly 0.3 mole of people if the average weight of a person is 73,000 grams?

Question

Weight problem

Answer 1

How many people are there in 0.3 moles of people?

1 mole of anything (people, apples, bricks, any chemical, etc) is 6.02x10²³ of those items.  So, 1 mole of people = 6.02x10²³ people.

 

0.3 moles of people x 6.02x10²³ people/mole = 1.806x10²³ people

1.806x1023 people x 73,000 g/person x 1 kg/1000 g = 1.3x10²⁵ kg =  1x10²⁵ kg (to 1 significant figure)