4NH3(g)+6NO(g)⇌5N2(g)+6H2O(g)△H1
己知:①H2O(l)=H2O(g)△H2
②4NH3(g)+5O2(g)=4NO(g)+6H2O(g)△H3
则NH3(g)的标准燃烧热的热化学方程式____.
如图所示的象棋盘上,若“士”的坐标是(﹣2,﹣2),“相”的坐标是(3,2),则“炮”的坐标是 ____.
I _______ the hospital at eight o'clock this morning.
12=6×2
12=3×4
20=____×2
20=____×4
20÷2=____
20÷4=____