Which of the following most completely describes an object's motion? a car travels 25 miles. the rain falls at a rate of one inch per hour. a marble rolls 10 m to the left. the baby crawls 10 feet in 15 seconds toward the door.

The answer to your question is D. The baby crawls 10 feet in 15 seconds toward the door

i believe it is 40–40–20%

explanation:

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.