Pb(NO3)2 (aq) +2 KI (aq) –> PbI2 (s) + 2 KNO3 (aq)
Mezclamos 25 ml 3M de KI CON 15 ml de una disolución 4M de Pb(NO3)2. Calcula la cantidad de precipitado amarillo que se obtendrá .
El reactivo limitante sera el KI ( demuestralo)

datos de masas atomicas ; Pb= 207,2 I =126,9

yes it is balanced

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.

c-14 is carbon-14, or radiocarbon.   it is a radioactive isotope of carbon with an atomic nucleus containing 6 protons and 8 neutrons.