Question

Calculati pentru 200 g PCl3 : a. masa (g) de clor , b.numarul de atomi de clor

Answer 1

a) 137,5 g PCl3...........3*35.5 g Cl
200 g PCl3.....................x g Cl
x = 154,90 g Cl
b) n = m/masa molara = 200/137.5 = 1.4545 moli
1 mol PCl3.............3*6.022*10^23 atomi Cl
1.4545 moli PCl3..............x atomi Cl
x = 26.277 * 10^23 atomi Cl

Answer 2

MPCl₃= AP + 3ACl = 31 + 3*35,5 = 137,5g/mol

a. In 137,5g PCl₃ se gasesc.....................3*35,5g Cl
In 200g PCl₃..............................................xg

x=200*3*35,5/137,5
x= Calculeaza!

b. mCl=35,5*3=106,5g Cl2

MCl2=2ACl=2*35,5=71g/mol

n=m/M=106,5/71=1,5 moli Cl2

1mol Cl2........................3NA=3*6,022*10^23 atomi
1,5 moli..........................x=Calculeaza!