All the following process produces hematite except A roasting of siderite
B oxidation of iron
C oxidation of magnetite
D drying of limonite
E no correct answer

D)driying of limonite these is the answer

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.

1.43 x 10^-11 j the guy commented the awnser just making sure u see it .