The hot, expanding gases generated by the combustion reaction in the engines are:
O A. released through the back of the engine to propel it and the
airplane forward.
B. used to move the pistons, which help to propel the airplane.
O c. used to provide lift for the airplane.
O D. used to move the wings.

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.