The illustration shows a rollercoaster add indicates four different positions the car might be at as it moves along the track. If friction weren’t a factor and no energy was lost, at which point in the rollercoaster journey is its potential energy the greatest? Choices:

A: W
B: X
C: Y
D: Z

Please help!

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.