Graduated cylinder Give the correct reading for the graduated cylinder. Remember to give a guessed digit and the unit. triple beam balance Give the correct reading for the triple beam balance. Remember to give a guessed digit and the unit. What is the significant figure rule for addition and subtraction? What is the significant figure rule for multiplication and division?

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.