1. adam found a block made of lead. the density of lead is 11.36 g/cm3. the lengths of the block's sides are 3.5 cm, 3.6 cm, and 2.6 cm, respectively. how heavy is adam's block?

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.

your answer would be “dry”