compound weighs 43.85g and contains only carbon and hydrogen. Analysis shows it contains 38.94g of carbon and 4.91g of hydrogen. Find its empirical formula.

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

If 22.5 liters of oxygen reacted with excess of hydrogen, how many liters of water vapor could be produced?

Which compound most likely has the greatest bond energy?