What is the density of a liquid at 25°C that has a mass of 4.5 grams and a volume of 12.0 mililitres? (Show working to receive credit.)
the rock cycle and he has been given a rock sample to analyse. He is told

petroleum? coal maybe?

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.

i'm assuming that it's c.) red bank..