In a 1 L vessel, 10 moles of methane and 50 moles of `O_(2)` are present. The number of moles of `O_(2)`, are present. The number of moles of `O_(2)`, water and `CO_(2)` present in the vessel are respectively after the vessel was heated to burn methane completely.

Options

A. 30, 20, 20
B. 30, 20, 10
C. 20, 30, 10
D. 20, 10, 30

Answer

B

Explanation

The combustion reaction for methane is as follows :
`{:(,CH_(4),+,2O_(2),rarr,CO_(2),+,2H_(2)O),("Initial moles",10,,50,,0,,0),("Final moles",0,,(50-20)=30,,10,,20):}`
[ `:'` According to balance equation, ratio of moles of `O_(2), H_(2)O` and `CO_(2)` are `2 : 2 : 1` respectively]
Hence, final moles of `O_(2)=30` moles
`H_(2)O=20` moles
`CO_(2)=10` moles and
option (b) is the correct answer.