+1Aqueous potassium iodide, Kl (aq) is added to a solution of lead (11) nitrate Pb(NO3)2, resulting in potassium nitrate, KNO3(aq) and a yellow solid (also called a precipitate in this situation).
Identify the yellow solid from the list below and explain your thinking.
a. PbI2(aq)
b. PbI2 (s)
c. Pb(No3)2(s)
d. KI(s)

b) PbI2(s)

Explanation:

because Iodide is not soluble with lead II and forms precipitate.

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.

i don't see a text, but i am gonna assume this *orbit* the curved path, usually elliptical, described by a planet, satellite, spaceship, etc., around a celestial body, as the sun.