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?

If you rewrite the following word equation as a balanced chemical equation, what will the coefficient and symbol for fluorine be? nitrogen trifluoride nitrogen + fluorine

For the reaction Cl2 + 2KBr –> 2KCl + Br2 calculate the percent yield if 200g of chlorine react with excess potassium bromide to produce 410 g of bromine.

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

Compared with a solution that has a pH of 2.00, a solution that has a pH of 4.00: