Standard Heat of Formation

Choose your answer in scientific notation, i.e., ± x.yzE{± ab}, and then press the 'Submit the above answer' button (below).

+ - 1 2 3 4 5 6 7 8 9 . 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 E{ + - 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 }