Question

How many moles of oxygen will be needed for complete combustion of 11.2 lit. of ethane?

• A. 3.5
• B. 3
• C. 1.75
• D. 2.5

Answer 1

The correct option is C 1.75

Combustion reaction of ethane:

$2C_2{H}_6+7O_2\to 4C{O}_2+6H_{2}O$

Moles of ethane$=\frac{11.2}{22.4}=0.5moles$

Moles of oxygen required$=\frac{7}{2}\times 0.5=1.75moles$