Which of the following reactions is endothermic? C (diamond) + O 2(g) → CO 2, ΔH = -94.50 kcal
H 2(g) + ½O 2(g) → H 2O(g), ΔH = -57.82 kcal
½N 2(g) + 3/2H 2(g) → NH 3(g) + 11.0 kcal
½N 2(g) + O 2(g) + 8.1 kcal → NO 2(g)

i'm not sure

explanation:

i'll try whatever you got

a corroding iron, if that's one of your choices

is there any options? maybe im just not seeing them but i need the options to

-love shrooms

explanation:

two years ago, when picking flowers in the mountains back of yosemite valley, i found a book. it was blotted and storm-beaten; all of its outer pages were mealy and crumbly. the paper seemed to dissolve like the snow beneath which it had been buried, however; many of the inner pages were well preserved. and although all were more or less stained and torn, whole chapters were easily readable. this is the condition of the great open book of yosemite glaciers today; its granite pages have been torn and blurred by the same storms that wasted the castaway book.

two years ago, when picking flowers in the mountains back of yosemite valley; i found a book. it was blotted and storm-beaten, all of its outer pages were mealy and crumbly. the paper seemed to dissolve like the snow beneath which it had been buried, however, many of the inner pages were well preserved. and although all were more or less stained and torn; whole chapters were easily readable. this is the condition of the great open book of yosemite glaciers today, its granite pages have been torn and blurred by the same storms that wasted the castaway book.