Which biome is characterized by leaves that change color in autumn, fall off of trees in the winter and grow back again in the spring? a) boreal forest b) alpine tundra c) tropical rainforest d) temperate deciduous forest

d. temperate deciduous forest

by cartels in other countries, shipped by air, mail, or land. i cant really see your answer choices : /

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.