Question

30 puncte!
Problema 6.23​

Answer 1

100 cm3 = 0.0001 m3

0.0001*0,1785 (densitate he)=0.00001785 kg /*1000

=0.01785 g (cantitate de heliu totala)

adica 0.0045 moli inmultim cu nr lui avogadro

0.0045*6,023 x 10 ²³=45*6023*10^16 atomi

=271035*10^16=2710350000*10^12 atomi =>2710350000 secunde

=45172500 minute

=752875 ore

approx 31370 zile

approx 86 de ani

Answer 2

V=100 cm³=10⁻⁴ m³

p=10⁵ Pa

T=273 K

μ=4 g/mol=0,004 kg/mol

m=μυ=μpV/RT=0,004*10⁵*10⁻⁴/8,314*273=1,7*10⁻⁵ kg

υ=m/μ=1,7*10⁻⁵/0,004=0,0044 moli

N=Na*υ=6,02*10²³*0,0044=2,65*10²¹ atomi

1 s...............................................10¹² atomi

x s...............................................2,65*10²¹ atomi

x=2,65*10²¹*1/10¹²=2650000000 s≅30671 zile≅84 ani