Apt A piece of chalk becomes shorter as it is used. Which of the following is NOT true of the shorter piece of chalk? A. Its mass has changed.
B. Its shape has changed.
C. Its volume has changed.
D. Its characteristic properties have changed.

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.

distance, luminosity, brightness, radius, chemical composition, and temperature