Calculate the work done in kilojoules when 17.58 grams of copper reacts with excess nitric acid to form copper(ii) nitrate, nitrogen dioxide gas and liquid water in (a) a closed 200ml vessel and (b) an open beaker at 30oc. in addition, indicate if the system is doing work on the surroundings or the surroundings are doing work on the system. assume ideal gas conditions.

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

How many moles of sulfuric acid (h2so4) are needed to react completely with 6.8 moles of lithium hydroxide (lioh)? 2lioh + h2so4 → li2so4 + 2h2o a. 3.4 mol h2so4b. 6.8 mol h2so4 c. 10.2 mol h2so4 d. 13.6 mol h2so4

What is the mass of oxygen gas is consumed in a reaction that produces 4.60mol so2