The total volume of hydrogen gas needed to fill the Hindenburg was 2 x 108L at 1 atm and 25C. How many kJ OF ENERGY WERE EVOLVED WHEN IT BURNED?

The total volume of hydrogen gas needed to fill the Hindenburg was 2 x 108L at 1 atm and 25C. How many kJ OF ENERGY WERE EVOLVED WHEN IT BURNED?