A girl (on the earth) drops a ball of mass 0.5 kg from a height of 2 metres. i. How much G. P.E. does the ball have before it has dropped?
ii. How much G. P.E. does it have once it hits the ground?
iii. What happens to all of the GPE? (think about energy transfers)

number of molecules / avogadro's number * molecule molecular = mass

explanation:

we define a gram-molecular weight as the mass of one mole of any element or compound. a mole contains avogadro's number of units (molecules) –  

6.022

x

10

23

. so, dividing the number of molecules by avogadro's number gives us the number of moles. multiplying that by the molecular weight gives us the mass. from the periodic table we find the gram-molecular weight of u to be238 and of f to be19. so,  

u

f

6

will have a gram-molecular weight of 352g.

explanation: no but i do not usually comment