Question

Un amestec de metan si etan are un continut de 22,58% hidrogen

Answer 1

notam a moli de CH4, miu = 16 g/mol

notam b moli de C2H6, miu = 30 g/mol

16 g CH4 ......................... 4 g H

16a g CH4 .................... 4a g H

30 g C2H6 ...................... 6 g H

30b g C2H6 ..................... 6b H

16a+30b .......................... 100%

4a+6b ............................. 22,58%

4,43(4a+6b) = 16a+30b

=> 1,71a = 3,42b

=> a = 2b

=> raportul CH4 : C2H6 = a : b = 2b : b /b

=> raportul CH4 : C2H6 = 2 : 1  => E.