Nitric acid is a chemical used in fertilizers and explosives. It is created by a mixture of ammonia and oxygen. NH32O2 HNO3H2O How many grams of O2 are needed to react with 80.0 g of NH3

Suppose that during that icy hot lab 65,000 j of energy were transferred to 450 g of water at 20°c what would have have been the final temperature of the water

1)each group 16 element has how many valence electrons? ( )4 ( )6 ( )8 ( )16 2)how many dots appear in the dot structure for calcium ion, ca2+? ( )zero ( )one ( )two ( )eight 3) which of the following atoms forms a cation to obtain an octet of outer shell electrons? ( )magnesium ( )oxygen ( )fluorine ( )helium 4) an al3+ ion contains 13 protons and 10 electrons. ( )true ( )false 5) valence and non-valence electrons are represented in lewis dot structures. ( )true ( )false

12. calculate the hydroxide ion concentration of a solution with ph = 3.25. show all calculations leading to an answer