The length of the cake pan given = 9 inch
The width of the cake pan = 11 inch
the height of the cake pan = 2 inch.
Given, after pouring the batter to the cake pan there is 1 inch gap between the top of the batter and the top of the pan.
We are given the height of the pan is 2 inch. As given there is 1 inch gap between top of the batter and the top of the pan, 
the height of the cake batter = 
 inch = 1 inch.
 inch = 1 inch.
Now the length and width of the cake batter is same as the cake pan.
The formula to find the volume of the cake batter = length×width×height
So, the required volume = 
 =
 = 

We have got the required answer. The volume of the cake batter is 
 .
.