A metal M forms a sparingly soluble sulfate salt. The logarithm of the concentration of the dissolved metal ion in a solution saturated in the metal sulfate is plotted bellow as a function of the logarithm of the concentration of sulfate ion in solution. What is the formula of the metal sulfate? a)M2SO4
b)MSO4
c)M2(SO4)3
d) M(SO4)2

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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.