Asample of calcium contains 0.025 moles how many atoms are in this sample

As we know 1 mole of any substance having particles Na=6.02×10^23

So 0.025 moles of calcium having

1 mole/0.025=6.02×10^23/x

×=0.025×6.02×10^23=1.51×10^22

i'm pretty sure its b i might be wrong though!

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)