4NH3(g) + 5O2(g) -> 4NO(g) + 6H2O(g) How many moles of ammonia (NH3) are needed if 2.75 moles of water (H2O) were produced?

4.13 mol

1.83 mol

4 mol

(only respond if you have the answer)

6.8 mol

Complete the table for ion charge based upon their losing or gaining electrons in the outer shell. (use the periodic table as necessary.) group most likely ionic charge # of valence electrons i +1 ii +2 iii +3 iv +4 or -4 v -3 vi -2 vii -1 viii 0

Determine the wavelength of the light absorbed when an electron in a hydrogen atom makes a transition from an orbital in the n=3 level to an orbital in the n=7 level.

Drag each label to the correct location on the chart. classify each reaction as endothermic or exothermic.