Which of these describes a challenge that the engineer of a high-altitude
airplane would need to consider?
O
A. The airplane will create more drag at higher altitudes than lower
altitudes
B. The airplane may succumb to the power of gravity as lift
decreases at higher altitudes,
O
C. More fuel is used at higher altitudes,
O
D. The airplane may need a heat shield for protection from sonic
booms

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.

може ли да зареждате повече информация, моля