which of these statements about isomers is not correct?

a. the existence of isomers is a reason for the large number of carbon compounds.

b. isomers have the same molecular formula.

c. isomers have different structural arrangements of their atoms

d. isomers have the same physical and chemical properties.

a

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.