V=250 cm cubi= 250 ml= 0,25 l
1 atm.....760 mmHg
x atm.....380 mmHg
x= [tex] \frac{380}{760} [/tex]= 0,5 atm ⇒ p=0,5 atm
t=127°C ⇒T= 273+127= 400 K
p*V=n*R*T
n=[tex] \frac{p*V}{RT}= \frac{0,5*0,25}{0,082*400} [/tex] = 3,81*10⁻³ moli
1 mol ........................... 6,023 *10²³ molecule
3,81 *10⁻³ moli................ a
a= 3,18 *6,023 *10⁻³ *10²³ = 19,15314 *10²⁰= 1915314*10¹⁵ molecule H₂S
