Hòa tan 5,6g FE vào 200gdyng dịch HCL thu được FECL2 và H2 tính VH2(ĐKC).Tính C% của dung dịch thu được

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.

colorless gas, exhibiting a blue glow when placed in an electric field

b) solid

its a type of rock

the answer is d.) potassium