2. Three students measured the mass of marble. Their data is shown below. Student 1
Student 2
Student 3
0.55 g
0.45 g
0.60 g
0.54 g
0.43 g
0.45 g
0.55 g
0.44 g
0.50 g
The actual mass of the marble is 0.44g. Describe each student's results in terms of
accuracy and precision.
I

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.

the objects have the same charge.