The pressure of a sample of helium in a 100 ml container is 0.1 atm. if the helium is compressed to a volume of 5 ml without changing the temperature, what would be the pressure of the gas?

2 atmospheres when you compress a gas to a smaller volume the pressure rises its inversely proportional. Ideal gas law helps with this PV=Nrt.

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.