How many molecules, hydrogen atoms, oxygen atoms present in 0.5 mole of H2O

Explanation:

0.5 mol of water = molecules. Water is composed of 2 hydrogen atoms and one oxygen atom. 0.5 mol of water = 6.022× atoms of hydrogen. Water contains one atom of oxygen.

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.

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(jacemorris04)