What is the density of a sample of a substance with a volume of 120ml
and a mass of 90g?

Explanation:

The density of a substance can be found by using the formula

From the question

mass = 90 g

volume = 120 mL

We have

We have the final answer as

Hope this helps you

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.