Select all (there's more than one) of the below chemicals that would be insoluble in water.
a
NH4OH

b
NaNO3

c
PbCrO4

d
SrSO4

e
K3PO4

f
AgClO4

g
HgCl2

h
FeCO3

i
NH4Br

j
Li2Cr2O7

FeCO₃ and PbCrO₄ is insoluble in water.

Explanation:

If any substance added to water and it form ions then it is soluble in water otherwise it is insoluble in water.

a. NH₄OH - soluble in water

b. NaNO₃ - soluble in water

C. PbCrO₄ is insoluble in water

d. SrSO₄ slightly soluble in water

e. K₃PO₄ - Soluble in water

f. AgClO₄- Highly Soluble in water

g. HgCl₂ - Slightly soluble in water

h. FeCO₃ -  insoluble in water

i. NH₄Br - soluble in water

j. Li₂Cr₂O₇ - soluble in water

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.