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Jawaban:

C.

Penjelasan:

Mis: CH4 = x Liter, maka C2H6 = ( 6 – x ) Liter

Perbandingan koefisien ~ perbandingan volume

CH4 : O2 = 1 : 3 maka Volume O2 = 3x Liter

C2H6 : O2 = 2 : 7, volume O2 = 7/2 ( 6 – x ) Liter

Total gas O2: 19 L, maka persaamaan reaksi:

3x + 7/2 ( 6 – x ) = 19

3x + 21 – 7/2x = 19

-1/2x = 2 => x = 4 Liter

C2H6 = ( 6 – 4 ) Liter

=> 2 Liter