How do hot air balloons stay in the air

The heated air.

Explanation:

The was hot air balloons stay in the air is because the flame heats the air int he balloon. Hot air travels upwards, causing the balloon to inflate and take off. The heated air pushes the balloon off the ground and into the air.

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.

lol idk man i guess u gotta ask bill nye the science guy