4NH3 + 702 4NO2 + 6H20 The coefficient for oxygen gas. O2, is:
A. 7
B. 4
С. 3
D. 1

The following transition occurs at a molecular level for a substance. what transition corresponds to this change in microscopic structure? the carbon dioxide molecules on the left are in a regular, tightly packed pattern. after heating, it becomes much lower density. a. melting b. boiling c. sublimation d. freezing