A balloon originally has 0.10 moles of helium and has a volume of 0.50 L. If 0.59 grams of He are added to the balloon, what will the new volume be? (Assume temperate and pressure do not change.)

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.

a compound is a molecule made of atoms from different elements.

a. by the combination of an unlimited number of elements

did anyone actually do this? like if anyone has submitted this i rly need .

answersilicon (si); oxygen (o);