The reaction      4Al (s)  +  3O2 (g)  ®  2Al2O3 (s)        DH° = -3351 kJis ____, and therefore heat is ____ by the reaction.

What is the solubility of silver nitrate if only 11.1 g can dissolve in 5.0 g of water at 20C?

Given the data in the table below, DH°rxn for the reaction      Ca(OH)2  +  2H3AsO4  ®  Ca(H2AsO4)2  + 2H2Ois ____ kJ.     

The value of DH° for the reaction below is -790 kJ. The enthalpy change accompanying the reaction of 0.95 g of S is ____ kJ.      2S (s)  +  3O2 (g)  ®  2SO3 (g)

Given the data in the table below, DH°rxn for the reaction      4NH3 (g)  +  5O2 (g)  ®  4NO (g)  +  6H2O (l)is ____ kJ.     

DH for the reaction      IF5 (g)  ®  IF3 (g)  +  F2 (g) is ____ kJ, give the data below.       IF (g)  +  F2 (g)  ®  IF3 (g)      DH = -390 kJ      IF (g)  +  2F2 (g)  ®  IF5 (g)      DH = -745 kJ

When the following equation is balanced, the coefficient of Al is ____.      Al (s)  +  H2O (l)  ®  Al(OH)3 (s)  +  H2 (g)

For the reaction _____Fe + ____H2O –> ____Fe3O4 + ____H2 how many moles of iron oxide are produced from 500g of iron? (WARNING:  This equation needs to be balanced!)

In the chemical equation HO(aq) ® HO(l) O2(g), the water is a ____.

Vinegar contains carbon, hydrogen, and oxygen with percent masses of 40.01% C and 6.70% H. If the molar mass of vinegar is about 60 g/mol, what is its molecular formula?