Question

Dau coroana! E urgent!!!!!! ​

Answer 1

Notatii:

n=nr de moli

ns=nr de moli scosi

Na=nr lui Avogadro

mr=masa de hidrogen ramasa

mi=masa initiala de hidrogen

ms=masa scoasa de hidrogen

u=masa molara

N=nr de molecule

Formule folosite:

n=m/u=N/Na

pV=nRT

Datele pb:

V=24,93 L=24,93*10^(-3) m^3

u=2 g/mol

p=12*10^5 Pa

t=27 C= 300 K

f=30%

Rezolvare:

a) pV=nRT

=>n=pV/RT=(12*10^5*24,93*10^(-3))/8,31*300=12 moli

n=N/Na => N=n*Na=12*6,022*10^23=72,264*10^23 molecule

b) mr=mi-ms=mi-f*mi=mi(1-f)

n=mi/u =>mi=n*u=12*2=24 g

mr=mi(1-f)=24(1-0,3)=24*0,7=16,8 g

c) ns=ms/u=(f*mi)/u=0,3*24/2=3,6 moli

ns=N/Na => N=ns*Na=3,6*6,022*10^23=21,6792*10^23 molecule care au parasit butelia