Mole Conversion: how many moles are in 1.78 x 10^22 atoms of potassium

Explanation:

This can most easily be done by using a proportional equation.

1 mol = 6.02 * 10^23 atoms

x mol = 1.78 * 10^22 atoms

1/x = 6.02 *10^23 / 1.78 * 10^22        Cross Multiply

1 * 1.78 * 10^22 = 6.02 * 10^23 x

x = 1.78 * 10^22 / 6.02 * 10^23

x = 0.029568 mols

This really ought to be 0.0296 mols

the answer is either b or c

question: ray weighs 100 kilograms, his wrestling partner, bobby, weighs 50 kilograms. if ray moves at 4 m s , how fast will bobby have to run at him to apply an equal amount of kinetic energy?

answer: 8 m/s he needs to run twice as fast to keep up so he has some work to do

explanation:   if the mass has units of kilograms and the velocity of meters per second, the kinetic energy has units of kilograms-meters squared per second squared.

question answered by

(jacemorris04)