A hiker climbs a hill. How does the potential energy of the hiker change as she climbs higher? A
Her potential energy decreases because her height above the ground increases.
B

Her potential energy decreases because her speed increases.
C
Her potential energy increases because her height above the ground increases.
D
Her potential energy increases because her speed increases.

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.