A gas collected when the pressure is 720 mm Hg occupies 250 mL. What volume will the gas occupy at 2.5 atm? (assume the temperature stays constant) ( 1 atm = 760 mm Hg)

mL (Round your answer to the closest whole number.)

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.

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