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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

Calculate the energy released when 24.8 g NaO reacts in the following reaction. NaO(s) + 2HI(g) 2NaI(s) + HO(l)            H = -120.00 kcal

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

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!)

Which of the following are synthesis reactions?  1)  CH4 (g)  +  O2 (g)  ®  CO2 (g)  +  H2O (l) 2)  CaO (s)  +  CO2 (g)  ®  CaCO3 (s) 3)  Mg (s)  +  O2 (g)  ®  MgO (s)  4)  PbCO3 (s)  ®  PbO (s)  +  CO2 (g)

Convert: 9.03 x 10^22 molecules NH3 = ____ mol NH3

Calculate the percentage composition (by mass) of Mg in Mg3(AsO4)2.

If 4mol of nitrogen reacts with 9mol of hydrogen, according to the given equation, how many moles of ammonia are formed?    N2 + 3H2 –> 2NH3

What is the molar mass of nitroglycerin, C3H5(NO3)3?

Which of these combats viral replication by utilizing inactive viruses in the development of antibodies?