Why is the air in the stratosphere stable? A denser air lies above this dense air
B cooler air lies above warmer air
C warmer air lies above cooler air
D both a and b

C

Explanation:

because warmer air lies above the cooler 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.

your parents i think this could be it